Investment Securities Available for Sale - Schedule Of Unrealized Loss On Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	$ 409,725	$ 2,523,310
Less than 12 months, gross unrealized losses	(2,666)	(173,930)
12 months or longer, fair value	7,513,154	6,989,855
12 months or longer, gross unrealized losses	(1,331,466)	(1,423,854)
Total, fair value	7,922,879	9,513,165
Total, gross unrealized losses	(1,334,132)	(1,597,784)
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value		139,737
Less than 12 months, gross unrealized losses		(6,789)
12 months or longer, fair value		307,582
12 months or longer, gross unrealized losses		(37,351)
Total, fair value		447,319
Total, gross unrealized losses		(44,140)
U.S. Government agency securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	0	28,938
Less than 12 months, gross unrealized losses	0	(1,053)
12 months or longer, fair value	28,940	19,603
12 months or longer, gross unrealized losses	(1,053)	(2,560)
Total, fair value	28,940	48,541
Total, gross unrealized losses	(1,053)	(3,613)
Mortgage-backed securities issued by U.S. Government agencies
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	159,402	187,655
Less than 12 months, gross unrealized losses	(1,268)	(5,952)
12 months or longer, fair value	565,358	521,395
12 months or longer, gross unrealized losses	(96,717)	(107,516)
Total, fair value	724,760	709,050
Total, gross unrealized losses	(97,985)	(113,468)
Mortgage-backed securities issued by U.S. Government sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	215,917	1,473,348
Less than 12 months, gross unrealized losses	(1,193)	(120,135)
12 months or longer, fair value	6,045,914	5,365,233
12 months or longer, gross unrealized losses	(1,093,019)	(1,130,105)
Total, fair value	6,261,831	6,838,581
Total, gross unrealized losses	(1,094,212)	(1,250,240)
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	0	119,649
Less than 12 months, gross unrealized losses	0	(10,311)
12 months or longer, fair value	587,595	535,478
12 months or longer, gross unrealized losses	(104,892)	(104,060)
Total, fair value	587,595	655,127
Total, gross unrealized losses	(104,892)	(114,371)
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	34,406	565,382
Less than 12 months, gross unrealized losses	(205)	(29,383)
12 months or longer, fair value	276,675	240,564
12 months or longer, gross unrealized losses	(35,448)	(42,262)
Total, fair value	311,081	805,946
Total, gross unrealized losses	(35,653)	(71,645)
Corporate debt securities and other debt securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	0	8,601
Less than 12 months, gross unrealized losses	0	(307)
12 months or longer, fair value	8,672	0
12 months or longer, gross unrealized losses	(337)	0
Total, fair value	8,672	8,601
Total, gross unrealized losses	$ (337)	$ (307)