FAIR VALUE MEASUREMENTS - Significant Valuation Inputs (Details) $ in Thousands	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 239,694	$ 163,489
Loan, Held-for-Sale, Fair Value	389,032	395,922	$ 468,142	$ 255,516
Residual interest securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	38,308	34,506
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, Fair Value	100,000	88,497
Loan, Held-for-Sale, Fair Value	$ 389,032	$ 369,983
Level 3 \| Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0.129	0.129
Loans Held For Sale, measurement input	0.055	0.076
Level 3 \| CPR
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0.135	0.142
Loans Held For Sale, measurement input	0.131	0.137
Level 3 \| CDR
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0.007	0.007
Loans Held For Sale, measurement input	0.014	0.017
Level 3 \| Servicing Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0.003	0.002
Level 3 \| Residual interest securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 38,308	$ 34,506
Level 3 \| Residual interest securities \| Discount Rate \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, measurement input	0.115	0.145
Level 3 \| Residual interest securities \| Discount Rate \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, measurement input	0.246	0.240
Level 3 \| Residual interest securities \| Discount Rate \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, measurement input	0.183	0.197
Level 3 \| Residual interest securities \| CPR \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, measurement input	0.162	0.152
Level 3 \| Residual interest securities \| CPR \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, measurement input	0.208	0.201
Level 3 \| Residual interest securities \| CPR \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, measurement input	0.188	0.177
Level 3 \| Residual interest securities \| CDR \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, measurement input	0	0.015
Level 3 \| Residual interest securities \| CDR \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, measurement input	0.024	0.017
Level 3 \| Residual interest securities \| CDR \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, measurement input	0.012	0.016
Level 3 \| HELOC loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, Fair Value	$ 98,120	$ 86,465
Loan, Held-for-Sale, Fair Value	$ 323,184	$ 366,154
Level 3 \| HELOC loans \| Discount Rate \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0.130	0.130
Loans Held For Sale, measurement input	0.049	0.064
Level 3 \| HELOC loans \| Discount Rate \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0.130	0.130
Loans Held For Sale, measurement input	0.089	0.101
Level 3 \| HELOC loans \| Discount Rate \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0.130	0.130
Loans Held For Sale, measurement input	0.065	0.076
Level 3 \| HELOC loans \| CPR \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0	0.010
Loans Held For Sale, measurement input	0.026	0.013
Level 3 \| HELOC loans \| CPR \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0.325	0.330
Loans Held For Sale, measurement input	0.396	0.324
Level 3 \| HELOC loans \| CPR \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0.137	0.144
Loans Held For Sale, measurement input	0.156	0.136
Level 3 \| HELOC loans \| CDR \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0	0
Loans Held For Sale, measurement input	0	0.015
Level 3 \| HELOC loans \| CDR \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0.049	0.044
Loans Held For Sale, measurement input	0.943	0.017
Level 3 \| HELOC loans \| CDR \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0.008	0.007
Loans Held For Sale, measurement input	0.016	0.016
Level 3 \| HELOC loans \| Servicing Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0.003	0.002
Level 3 \| HELOC loans \| Loss Severity \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0	0.166
Level 3 \| HELOC loans \| Loss Severity \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0.976	0.442
Level 3 \| HELOC loans \| Loss Severity \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0.284	0.324
Level 3 \| Mortgage loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, Fair Value	$ 1,880	$ 2,032
Level 3 \| Mortgage loans \| Discount Rate \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0.095	0.100
Level 3 \| Mortgage loans \| Discount Rate \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0.105	0.110
Level 3 \| Mortgage loans \| Discount Rate \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0.103	0.108
Level 3 \| Mortgage loans \| CPR \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0.036	0.039
Level 3 \| Mortgage loans \| CPR \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0.080	0.082
Level 3 \| Mortgage loans \| CPR \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0.053	0.057
Level 3 \| Mortgage loans \| CDR \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0	0
Level 3 \| Mortgage loans \| CDR \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0.011	0.010
Level 3 \| Mortgage loans \| CDR \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0.004	0.002
Level 3 \| Mortgage loans \| Servicing Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Assets, measurement input	0	0
Level 3 \| Personal loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loan, Held-for-Sale, Fair Value	$ 62,935
Level 3 \| Personal loans \| Discount Rate \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0.089
Level 3 \| Personal loans \| Discount Rate \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0.115
Level 3 \| Personal loans \| Discount Rate \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0.102
Level 3 \| Personal loans \| CPR \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0
Level 3 \| Personal loans \| CPR \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0
Level 3 \| Personal loans \| CPR \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0
Level 3 \| Personal loans \| CDR \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0
Level 3 \| Personal loans \| CDR \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0
Level 3 \| Personal loans \| CDR \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0
Level 3 \| Personal loans \| Loss Severity \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0
Level 3 \| Personal loans \| Loss Severity \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0
Level 3 \| Personal loans \| Loss Severity \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0
Level 3 \| Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loan, Held-for-Sale, Fair Value	$ 2,913	$ 3,829
Level 3 \| Other \| Discount Rate \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0.062	0.051
Level 3 \| Other \| Discount Rate \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0.087	0.087
Level 3 \| Other \| Discount Rate \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0.071	0.069
Level 3 \| Other \| CPR \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0.180	0.179
Level 3 \| Other \| CPR \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0.404	0.997
Level 3 \| Other \| CPR \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0.247	0.256
Level 3 \| Other \| CDR \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0.013	0.004
Level 3 \| Other \| CDR \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0.087	0.102
Level 3 \| Other \| CDR \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0.061	0.077
Level 3 \| Other \| Loss Severity \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0.880	0.880
Level 3 \| Other \| Loss Severity \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0.920	0.920
Level 3 \| Other \| Loss Severity \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held For Sale, measurement input	0.900	0.900

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