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Investment Securities - Summary of Securities Available for Sale (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt securities AFS:
Amortized Cost		$ 2,122,680,000	$ 2,429,808,000
Gross Unrealized Gains		337,000	6,199,000
Gross Unrealized Losses		(299,774,000)	(290,948,000)
Fair Value		1,823,243,000	2,145,059,000
Debt securities HTM:
Amortized Cost		252,385,000	263,912,000
Gross Unrealized Gains		0	0
Gross Unrealized Losses		(21,261,000)	(13,394,000)
Fair Value		231,124,000	250,518,000
Accrued interest receivable for investment securities available for sale		$ 7,600,000	$ 11,000,000.0
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]		Accrued interest receivable	Accrued interest receivable
Unrealized gains on securities available for sale net of taxes		$ (227,872,000)	$ (204,738,000)
Net gains on sales of securities available for sale		936,000	0	$ 0
Available-for-sale Securities
Debt securities HTM:
Unrealized gains on securities available for sale net of taxes		(210,500,000)	(200,200,000)
CMOs
Debt securities AFS:
Amortized Cost		861,179,000	888,631,000
Gross Unrealized Gains		152,000	367,000
Gross Unrealized Losses		(139,425,000)	(141,279,000)
Fair Value		721,906,000	747,719,000
Residential
Debt securities AFS:
Amortized Cost		473,099,000	499,431,000
Gross Unrealized Gains		0	0
Gross Unrealized Losses		(86,039,000)	(79,133,000)
Fair Value		387,060,000	420,298,000
Debt securities HTM:
Amortized Cost		142,059,000	150,369,000
Gross Unrealized Gains		0	0
Gross Unrealized Losses		(12,629,000)	(6,663,000)
Fair Value		129,430,000	143,706,000
Corporate securities
Debt securities AFS:
Amortized Cost		23,254,000	23,302,000
Gross Unrealized Gains		0	0
Gross Unrealized Losses		(2,560,000)	(3,868,000)
Fair Value		20,694,000	19,434,000
Municipal securities
Debt securities AFS:
Amortized Cost		191,138,000	314,554,000
Gross Unrealized Gains		28,000	5,698,000
Gross Unrealized Losses		(15,615,000)	(11,779,000)
Fair Value		$ 175,551,000	308,473,000
Non-US Government and Agency Securities | Credit concentration risk | Stockholders' equity
Debt securities HTM:
Maximum exposure to any single issuer	10.00%	10.00%
Asset-backed securities
Debt securities AFS:
Amortized Cost		$ 103,081,000	150,992,000
Gross Unrealized Gains		157,000	0
Gross Unrealized Losses		(14,000)	(1,322,000)
Fair Value		103,224,000	149,670,000
U.S. Treasury securities
Debt securities AFS:
Amortized Cost		0	103,691,000
Gross Unrealized Gains		0	21,000
Gross Unrealized Losses		0	(35,000)
Fair Value		0	103,677,000
Agency securities
Debt securities AFS:
Amortized Cost		4,000,000	4,000,000
Gross Unrealized Gains		0	0
Gross Unrealized Losses		(43,000)	(100,000)
Fair Value		3,957,000	3,900,000
Commercial
Debt securities AFS:
Amortized Cost		466,929,000	445,207,000
Gross Unrealized Gains		0	113,000
Gross Unrealized Losses		(56,078,000)	(53,432,000)
Fair Value		410,851,000	391,888,000
Debt securities HTM:
Amortized Cost		110,326,000	113,543,000
Gross Unrealized Gains		0	0
Gross Unrealized Losses		(8,632,000)	(6,731,000)
Fair Value		$ 101,694,000	$ 106,812,000

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