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Debt Securities - Schedule of Amortized Cost, Unrealized Gains and Losses, and Fair Values of Securities Classified as AFS and HTM (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt securities available for sale
Amortized Cost	$ 2,663,921	$ 2,772,453
Gross unrealized gains	212	144
Gross unrealized losses	(280,583)	(311,204)
Fair Value	2,383,550	2,461,393
Debt securities held to maturity
Amortized Cost	907,559	918,312
Gross unrealized gains	0	0
Gross unrealized losses	(126,906)	(133,017)
Fair Value	780,653	785,295
U.S. Treasury securities
Debt securities available for sale
Amortized Cost	87,182	117,805
Gross unrealized gains	0	0
Gross unrealized losses	(2,550)	(3,744)
Fair Value	84,632	114,061
Obligations of U.S. government corporations and agencies
Debt securities available for sale
Amortized Cost	11,855	20,097
Gross unrealized gains	3	3
Gross unrealized losses	(231)	(321)
Fair Value	11,627	19,779
Obligations of states and political subdivisions
Debt securities available for sale
Amortized Cost	274,858	283,481
Gross unrealized gains	193	106
Gross unrealized losses	(20,790)	(26,075)
Fair Value	254,261	257,512
Asset-backed securities
Debt securities available for sale
Amortized Cost	488,234	489,558
Gross unrealized gains	0	0
Gross unrealized losses	(19,087)	(19,683)
Fair Value	469,147	469,875
Commercial mortgage-backed securities
Debt securities available for sale
Amortized Cost	123,720	124,423
Gross unrealized gains	0	0
Gross unrealized losses	(14,893)	(16,029)
Fair Value	108,827	108,394
Debt securities held to maturity
Amortized Cost	470,138	474,820
Gross unrealized gains	0	0
Gross unrealized losses	(63,198)	(63,738)
Fair Value	406,940	411,082
Residential mortgage-backed securities
Debt securities available for sale
Amortized Cost	1,426,529	1,463,971
Gross unrealized gains	4	2
Gross unrealized losses	(200,599)	(220,717)
Fair Value	1,225,934	1,243,256
Debt securities held to maturity
Amortized Cost	437,421	443,492
Gross unrealized gains	0	0
Gross unrealized losses	(63,708)	(69,279)
Fair Value	373,713	374,213
Corporate debt securities
Debt securities available for sale
Amortized Cost	251,543	273,118
Gross unrealized gains	12	33
Gross unrealized losses	(22,433)	(24,635)
Fair Value	$ 229,122	$ 248,516

X

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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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