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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	Jun. 30, 2023	Dec. 31, 2022
Debt securities available for sale
Amortized Cost	$ 2,580,638	$ 2,772,453
Gross unrealized gains	179	144
Gross unrealized losses	(296,969)	(311,204)
Fair Value	2,283,848	2,461,393
Debt securities held to maturity
Amortized Cost	894,102	918,312
Gross unrealized gains	0	0
Gross unrealized losses	(147,600)	(133,017)
Fair Value	746,502	785,295
U.S. Treasury securities
Debt securities available for sale
Amortized Cost	61,995	117,805
Gross unrealized gains	0	0
Gross unrealized losses	(2,065)	(3,744)
Fair Value	59,930	114,061
Obligations of U.S. government corporations and agencies
Debt securities available for sale
Amortized Cost	11,391	20,097
Gross unrealized gains	2	3
Gross unrealized losses	(281)	(321)
Fair Value	11,112	19,779
Obligations of states and political subdivisions
Debt securities available for sale
Amortized Cost	262,306	283,481
Gross unrealized gains	71	106
Gross unrealized losses	(22,622)	(26,075)
Fair Value	239,755	257,512
Asset-backed securities
Debt securities available for sale
Amortized Cost	487,190	489,558
Gross unrealized gains	0	0
Gross unrealized losses	(13,108)	(19,683)
Fair Value	474,082	469,875
Commercial mortgage-backed securities
Debt securities available for sale
Amortized Cost	120,596	124,423
Gross unrealized gains	0	0
Gross unrealized losses	(16,833)	(16,029)
Fair Value	103,763	108,394
Debt securities held to maturity
Amortized Cost	463,895	474,820
Gross unrealized gains	0	0
Gross unrealized losses	(75,806)	(63,738)
Fair Value	388,089	411,082
Residential mortgage-backed securities
Debt securities available for sale
Amortized Cost	1,384,992	1,463,971
Gross unrealized gains	2	2
Gross unrealized losses	(218,301)	(220,717)
Fair Value	1,166,693	1,243,256
Debt securities held to maturity
Amortized Cost	430,207	443,492
Gross unrealized gains	0	0
Gross unrealized losses	(71,794)	(69,279)
Fair Value	358,413	374,213
Corporate debt securities
Debt securities available for sale
Amortized Cost	252,168	273,118
Gross unrealized gains	104	33
Gross unrealized losses	(23,759)	(24,635)
Fair Value	$ 228,513	$ 248,516

X

- Definition

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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