Securities - Schedule of Debt Securities, Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Debt securities available-for-sale:
Amortized Cost	$ 742,033		$ 780,079
Gross Unrealized Gains	2,649		194
Gross Unrealized Losses	(23,198)		(26,381)
Estimated Fair Value	721,484		753,892
Allowance for Securities Credit Losses	0		0
Debt securities held-to-maturity:
Amortized Cost	1,106,801		1,160,868
Gross Unrealized Gains	369		1,553
Gross Unrealized Losses	(103,320)		(93,983)
Estimated Fair Value	1,003,850		1,068,438
Allowance for Securities Credit Losses	(958)	$ (1,058)	(1,133)	$ (964)	$ (1,043)	$ (1,128)
Total, amortized cost	1,848,834		1,940,947
Total, gross unrealized gains	3,018		1,747
Total, gross unrealized losses	(126,518)		(120,364)
Total, estimated fair value	1,725,334		1,822,330
U.S. government and agency obligations
Debt securities available-for-sale:
Amortized Cost	60,575		66,490
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(6,019)		(5,796)
Estimated Fair Value	54,556		60,694
Allowance for Securities Credit Losses	0		0
Corporate debt securities
Debt securities available-for-sale:
Amortized Cost	15,950		10,096
Gross Unrealized Gains	44		11
Gross Unrealized Losses	(922)		(981)
Estimated Fair Value	15,072		9,126
Allowance for Securities Credit Losses	0		0
Debt securities held-to-maturity:
Amortized Cost	66,646		69,809
Gross Unrealized Gains	200		391
Gross Unrealized Losses	(2,489)		(3,941)
Estimated Fair Value	64,357		66,259
Allowance for Securities Credit Losses	(818)		(987)
Asset-backed securities
Debt securities available-for-sale:
Amortized Cost	276,036		295,796
Gross Unrealized Gains	372		0
Gross Unrealized Losses	(302)		(4,252)
Estimated Fair Value	276,106		291,544
Allowance for Securities Credit Losses	0		0
Agency residential
Debt securities available-for-sale:
Amortized Cost	280,357		298,107
Gross Unrealized Gains	2,233		183
Gross Unrealized Losses	0		(97)
Estimated Fair Value	282,590		298,193
Allowance for Securities Credit Losses	0		0
Debt securities held-to-maturity:
Amortized Cost	727,463		765,632
Gross Unrealized Gains	16		901
Gross Unrealized Losses	(77,345)		(70,040)
Estimated Fair Value	650,134		696,493
Allowance for Securities Credit Losses	0		0
Agency commercial
Debt securities available-for-sale:
Amortized Cost	109,115		109,590
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(15,955)		(15,255)
Estimated Fair Value	93,160		94,335
Allowance for Securities Credit Losses	0		0
Debt securities held-to-maturity:
Amortized Cost	81,403		82,734
Gross Unrealized Gains	1		10
Gross Unrealized Losses	(5,443)		(3,678)
Estimated Fair Value	75,961		79,066
Allowance for Securities Credit Losses	0		0
State, municipal, and sovereign debt obligations
Debt securities held-to-maturity:
Amortized Cost	210,758		222,009
Gross Unrealized Gains	152		251
Gross Unrealized Losses	(16,505)		(14,550)
Estimated Fair Value	194,405		207,710
Allowance for Securities Credit Losses	(34)		(39)
Non-agency commercial
Debt securities held-to-maturity:
Amortized Cost	20,531		20,684
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(1,538)		(1,774)
Estimated Fair Value	18,993		18,910
Allowance for Securities Credit Losses	(106)		(107)
Total mortgage-backed securities
Debt securities available-for-sale:
Amortized Cost	389,472		407,697
Gross Unrealized Gains	2,233		183
Gross Unrealized Losses	(15,955)		(15,352)
Estimated Fair Value	375,750		392,528
Allowance for Securities Credit Losses	0		0
Debt securities held-to-maturity:
Amortized Cost	829,397		869,050
Gross Unrealized Gains	17		911
Gross Unrealized Losses	(84,326)		(75,492)
Estimated Fair Value	745,088		794,469
Allowance for Securities Credit Losses	$ (106)		$ (107)