Debt Securities - Schedule of Amortized Cost, Unrealized Gains and Losses, and Fair Values of Securities Classified as AFS and HTM (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt securities available for sale
Amortized Cost	$ 2,517,294	$ 2,772,453
Gross unrealized gains	99	144
Gross unrealized losses	(334,552)	(311,204)
Fair Value	2,182,841	2,461,393
Debt securities held to maturity
Amortized Cost	882,614	918,312
Gross unrealized gains	0	0
Gross unrealized losses	(180,938)	(133,017)
Fair Value	701,676	785,295
U.S. Treasury securities
Debt securities available for sale
Amortized Cost	51,522	117,805
Gross unrealized gains	0	0
Gross unrealized losses	(1,392)	(3,744)
Fair Value	50,130	114,061
Obligations of U.S. government corporations and agencies
Debt securities available for sale
Amortized Cost	10,071	20,097
Gross unrealized gains	2	3
Gross unrealized losses	(254)	(321)
Fair Value	9,819	19,779
Obligations of states and political subdivisions
Debt securities available for sale
Amortized Cost	254,549	283,481
Gross unrealized gains	6	106
Gross unrealized losses	(27,758)	(26,075)
Fair Value	226,797	257,512
Asset-backed securities
Debt securities available for sale
Amortized Cost	486,517	489,558
Gross unrealized gains	0	0
Gross unrealized losses	(7,069)	(19,683)
Fair Value	479,448	469,875
Commercial mortgage-backed securities
Debt securities available for sale
Amortized Cost	120,117	124,423
Gross unrealized gains	0	0
Gross unrealized losses	(19,817)	(16,029)
Fair Value	100,300	108,394
Debt securities held to maturity
Amortized Cost	459,866	474,820
Gross unrealized gains	0	0
Gross unrealized losses	(93,401)	(63,738)
Fair Value	366,465	411,082
Residential mortgage-backed securities
Debt securities available for sale
Amortized Cost	1,343,324	1,463,971
Gross unrealized gains	0	2
Gross unrealized losses	(254,528)	(220,717)
Fair Value	1,088,796	1,243,256
Debt securities held to maturity
Amortized Cost	422,748	443,492
Gross unrealized gains	0	0
Gross unrealized losses	(87,537)	(69,279)
Fair Value	335,211	374,213
Corporate debt securities
Debt securities available for sale
Amortized Cost	251,194	273,118
Gross unrealized gains	91	33
Gross unrealized losses	(23,734)	(24,635)
Fair Value	$ 227,551	$ 248,516

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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