Investment Securities - Additional Information (Details)	3 Months Ended		9 Months Ended
	Mar. 31, 2025 USD ($) security	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Carrying value of investment securities	$ 2,750,000,000		$ 2,610,000,000
Investment securities pledged as collateral	161,400,000		162,400,000
Available for sale securities sold	0	$ 0
Provision for credit loss	0	0	(330,000)
Allowance for credit loss, held-to-maturity	2,005,000	$ 2,005,000	2,005,000	$ 2,005,000
Debt securities available for sale unrealized loss position	297,493,000		338,604,000
Fair value of unrealized losses	$ 295,245,000		334,860,000
Percentage of Company's investment portfolio	38.90%
Maturity description of investment portfolio	five years or less
Number of investment securities available for sale \| security	1,516
Number of investment in debt securities available-for-sale unrealized loss position \| security	1,287
Number of investment securities held to maturity \| security	511
Unrealized losses	$ 116,726,000		132,303,000
Number of investments in debt securities held-to-maturity unrealized loss position \| security	501
U.S. government-sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Allowance for credit loss, held-to-maturity	$ 0		0
Debt securities available for sale unrealized loss position	11,520,000		14,072,000
Fair value of unrealized losses	$ 11,305,000		13,746,000
Number of investment in debt securities available-for-sale unrealized loss position \| security	66
Unrealized losses	$ 2,249,000		3,021,000
Number of investments in debt securities held-to-maturity unrealized loss position \| security	5
U.S. government-sponsored mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Allowance for credit loss, held-to-maturity	$ 0		0
Debt securities available for sale unrealized loss position	169,526,000		203,539,000
Fair value of unrealized losses	$ 169,312,000		202,451,000
Number of investment in debt securities available-for-sale unrealized loss position \| security	637
Unrealized losses	$ 4,509,000		6,695,000
Number of investments in debt securities held-to-maturity unrealized loss position \| security	19
Private mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities available for sale unrealized loss position	$ 10,541,000		13,249,000
Fair value of unrealized losses	$ 10,541,000		13,120,000
Number of investment in debt securities available-for-sale unrealized loss position \| security	31
Non-government-sponsored asset backed securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities available for sale unrealized loss position	$ 2,772,000		3,434,000
Fair value of unrealized losses	$ 2,549,000		3,374,000
Number of investment in debt securities available-for-sale unrealized loss position \| security	29
State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Allowance for credit loss, held-to-maturity	$ 2,005,000		2,005,000
Debt securities available for sale unrealized loss position	87,861,000		86,029,000
Fair value of unrealized losses	$ 86,529,000		84,799,000
Number of investment in debt securities available-for-sale unrealized loss position \| security	461
Unrealized losses	$ 109,968,000		122,587,000
Number of investments in debt securities held-to-maturity unrealized loss position \| security	477
Other securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities available for sale unrealized loss position	$ 15,273,000		18,281,000
Fair value of unrealized losses	$ 15,009,000		$ 17,370,000
Number of investment in debt securities available-for-sale unrealized loss position \| security	63

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