Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AFS investment securities:
Amortized Cost	$ 1,176,040	$ 2,904,745
Gross Unrealized Gain	433	0
Gross Unrealized Loss	(36,402)	(303,732)
Estimated Fair Value	1,140,071	2,601,013
HTM investment securities:
Amortized Cost	1,729,667	1,388,146
Allowance for Credit Losses	(126)	(43)	$ (22)
Net Carrying Amount	1,729,541	1,388,103
Gross Unrealized Gain	2,694	44
Gross Unrecognized Loss	(246,729)	(291,051)
Estimated Fair Value	1,485,506	1,097,096
U.S. Treasury
AFS investment securities:
Amortized Cost	538,899	49,156
Gross Unrealized Gain	381	0
Gross Unrealized Loss	(24)	(2,139)
Estimated Fair Value	539,256	47,017
Agency
AFS investment securities:
Amortized Cost	1,941	485,331
Gross Unrealized Gain	0	0
Gross Unrealized Loss	(73)	(53,893)
Estimated Fair Value	1,868	431,438
Corporate
AFS investment securities:
Amortized Cost	481,499	586,652
Gross Unrealized Gain	52	0
Gross Unrealized Loss	(35,208)	(44,104)
Estimated Fair Value	446,343	542,548
Municipal bonds
HTM investment securities:
Amortized Cost	1,146,244	1,148,055
Allowance for Credit Losses	(126)	(43)
Net Carrying Amount	1,146,118	1,148,012
Gross Unrealized Gain	819	44
Gross Unrecognized Loss	(206,361)	(257,430)
Estimated Fair Value	940,576	890,626
Collateralized mortgage obligations
AFS investment securities:
Amortized Cost	153,701	829,928
Gross Unrealized Gain	0	0
Gross Unrealized Loss	(1,097)	(65,699)
Estimated Fair Value	152,604	764,229
HTM investment securities:
Amortized Cost	334,997
Allowance for Credit Losses	0
Net Carrying Amount	334,997
Gross Unrealized Gain	1,565
Gross Unrecognized Loss	(9,570)
Estimated Fair Value	326,992
Mortgage-backed securities
AFS investment securities:
Amortized Cost		953,678
Gross Unrealized Gain		0
Gross Unrealized Loss		(137,897)
Estimated Fair Value		815,781
HTM investment securities:
Amortized Cost	232,157	231,692
Allowance for Credit Losses	0	0
Net Carrying Amount	232,157	231,692
Gross Unrealized Gain	310	0
Gross Unrecognized Loss	(30,798)	(33,621)
Estimated Fair Value	201,669	198,071
Other
HTM investment securities:
Amortized Cost	16,269	8,399
Allowance for Credit Losses	0	0
Net Carrying Amount	16,269	8,399
Gross Unrealized Gain	0	0
Gross Unrecognized Loss	0	0
Estimated Fair Value	$ 16,269	$ 8,399

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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