LOANS RECEIVABLE, NET - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 4,788,772		$ 4,672,924
Allowance for credit losses	(56,479)	$ (58,998)	(60,086)	$ (61,466)	$ (63,444)	$ (65,691)
Loans receivable, net	4,732,293		4,612,838
Commercial portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	3,146,782		2,959,164
Commercial portfolio \| Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	1,273,927		1,175,490
Allowance for credit losses	(13,180)	(17,019)	(13,505)	(10,732)	(14,550)	(18,331)
Commercial portfolio \| Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	1,454,104		1,351,604
Allowance for credit losses	(4,417)	(2,757)	(2,794)	(4,787)	(4,671)	(2,133)
Commercial portfolio \| Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	396,197		411,387
Allowance for credit losses	(2,344)	(2,087)	(1,600)	(1,657)	(1,502)	(1,276)
Commercial portfolio \| Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	22,554		20,683
Allowance for credit losses	(1,515)	(1,286)	(1,253)	(828)	(837)	(24)
Commercial portfolio \| Residential real estate lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	(7,392)	(8,976)	(9,493)	(12,396)		(13,273)
Retail portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	1,641,990		1,713,760
Retail portfolio \| Residential real estate lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	1,277,355		1,313,617
Allowance for credit losses				(12,396)	(12,404)
Retail portfolio \| Consumer solar
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	335,531		365,516
Allowance for credit losses	(26,653)	$ (25,074)	(29,095)	$ (28,764)	$ (27,026)	$ (27,978)
Retail portfolio \| Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 29,104		$ 34,627

Amalgamated Financial Corp. 10-Q