Investment Securities - Amortized Cost and Estimated Fair Value of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
AFS investment securities:
Amortized Cost	$ 2,904,745	$ 4,278,589
Gross Unrealized Gain	0	46,232
Gross Unrealized Loss	(303,732)	(50,957)
Estimated Fair Value	2,601,013	4,273,864
HTM investment securities:
Amortized Cost	1,388,146	381,696
Allowance for Credit Losses	(43)	(22)	$ 0
Net Carrying Amount	1,388,103	381,674
Gross Unrealized Gain	44	4,398
Gross Unrecognized Loss	(291,051)	(1,649)
Estimated Fair Value	1,097,096	384,423
US Treasury Securities [Member]
AFS investment securities:
Amortized Cost	49,156	57,708
Gross Unrealized Gain	0	614
Gross Unrealized Loss	(2,139)	(456)
Estimated Fair Value	47,017	57,866
Agency
AFS investment securities:
Amortized Cost	485,331	440,183
Gross Unrealized Gain	0	2,081
Gross Unrealized Loss	(53,893)	(10,129)
Estimated Fair Value	431,438	432,135
Corporate
AFS investment securities:
Amortized Cost	586,652	451,621
Gross Unrealized Gain	0	6,096
Gross Unrealized Loss	(44,104)	(3,856)
Estimated Fair Value	542,548	453,861
Municipal bonds
AFS investment securities:
Amortized Cost		1,061,985
Gross Unrealized Gain		32,209
Gross Unrealized Loss		(4,281)
Estimated Fair Value		1,089,913
HTM investment securities:
Amortized Cost	1,148,055	368,344
Allowance for Credit Losses	(43)	(22)
Net Carrying Amount	1,148,012	368,322
Gross Unrealized Gain	44	3,834
Gross Unrecognized Loss	(257,430)	(1,649)
Estimated Fair Value	890,626	370,507
Collateralized mortgage obligations
AFS investment securities:
Amortized Cost	829,928	680,686
Gross Unrealized Gain	0	2,012
Gross Unrealized Loss	(65,699)	(6,055)
Estimated Fair Value	764,229	676,643
Mortgage-backed securities
AFS investment securities:
Amortized Cost	953,678	1,586,406
Gross Unrealized Gain	0	3,220
Gross Unrealized Loss	(137,897)	(26,180)
Estimated Fair Value	815,781	1,563,446
HTM investment securities:
Amortized Cost	231,692	11,843
Allowance for Credit Losses	0	0
Net Carrying Amount	231,692	11,843
Gross Unrealized Gain	0	564
Gross Unrecognized Loss	(33,621)	0
Estimated Fair Value	198,071	12,407
Other
HTM investment securities:
Amortized Cost	8,399	1,509
Allowance for Credit Losses	0	0
Net Carrying Amount	8,399	1,509
Gross Unrealized Gain	0	0
Gross Unrecognized Loss	0	0
Estimated Fair Value	$ 8,399	$ 1,509

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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