Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
AFS investment securities
Debt Securities, Available-for-Sale, Amortized Cost	$ 5,367,813	$ 4,605,954
Debt Securities, Available-for-Sale, Unrealized Gain	41,301	5,693
Debt Securities, Available-for-sale, Unrealized Loss	(11,551)	(30,213)
Debt Securities, Available-for-sale	5,397,563	4,581,434
HTM investment securities
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,602,576	3,738,747
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	3,488	42,653
Held-to-maturity, Gross Unrealized Loss	(415,070)	(595,906)
Debt Securities, Held-to-Maturity, Fair Value	3,190,994	3,185,494
US Treasury Securities [Member]
HTM investment securities
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	996	1,000
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	19	0
Held-to-maturity, Gross Unrealized Loss	0	(1)
Debt Securities, Held-to-Maturity, Fair Value	1,015	999
US States and Political Subdivisions Debt Securities [Member]
AFS investment securities
Debt Securities, Available-for-Sale, Amortized Cost	3,063	3,063
Debt Securities, Available-for-Sale, Unrealized Gain	1	0
Debt Securities, Available-for-sale, Unrealized Loss	(20)	(58)
Debt Securities, Available-for-sale	3,044	3,005
HTM investment securities
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,628,088	1,659,722
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	3,070	1,122
Held-to-maturity, Gross Unrealized Loss	(123,856)	(174,202)
Debt Securities, Held-to-Maturity, Fair Value	1,507,302	1,486,642
Residential Mortgage-Backed Securities [Member] \| US Government Sponsored-Enterprise Insured Loans [Member]
AFS investment securities
Debt Securities, Available-for-Sale, Amortized Cost	134,142	120,272
Debt Securities, Available-for-Sale, Unrealized Gain	1,214	190
Debt Securities, Available-for-sale, Unrealized Loss	(5,493)	(9,534)
Debt Securities, Available-for-sale	129,863	110,928
HTM investment securities
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	823,630	885,476
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	165	22,934
Held-to-maturity, Gross Unrealized Loss	(127,333)	(186,464)
Debt Securities, Held-to-Maturity, Fair Value	696,462	721,946
Residential Mortgage-Backed Securities [Member] \| Government National Mortgage Association (GNMA) [Member]
AFS investment securities
Debt Securities, Available-for-Sale, Amortized Cost	5,000,015	4,236,199
Debt Securities, Available-for-Sale, Unrealized Gain	40,067	5,379
Debt Securities, Available-for-sale, Unrealized Loss	(253)	(13,851)
Debt Securities, Available-for-sale	5,039,829	4,227,727
HTM investment securities
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	39,123	43,693
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	82	9
Held-to-maturity, Gross Unrealized Loss	(2,321)	(3,774)
Debt Securities, Held-to-Maturity, Fair Value	36,884	39,927
Commercial Mortgage-Backed Securities [Member] \| US Government Sponsored-Enterprise Insured Loans [Member]
AFS investment securities
Debt Securities, Available-for-Sale, Amortized Cost	17,959	18,332
Debt Securities, Available-for-Sale, Unrealized Gain	0	0
Debt Securities, Available-for-sale, Unrealized Loss	(1,001)	(1,332)
Debt Securities, Available-for-sale	16,958	17,000
HTM investment securities
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	763,370	772,456
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	0	10,217
Held-to-maturity, Gross Unrealized Loss	(113,004)	(159,078)
Debt Securities, Held-to-Maturity, Fair Value	650,366	623,595
Commercial Mortgage-Backed Securities [Member] \| Government National Mortgage Association (GNMA) [Member]
AFS investment securities
Debt Securities, Available-for-Sale, Amortized Cost	113,374	116,275
Debt Securities, Available-for-Sale, Unrealized Gain	0	0
Debt Securities, Available-for-sale, Unrealized Loss	(3,818)	(4,800)
Debt Securities, Available-for-sale	109,556	111,475
HTM investment securities
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	44,552	52,219
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	152	236
Held-to-maturity, Gross Unrealized Loss	(4,566)	(6,424)
Debt Securities, Held-to-Maturity, Fair Value	40,138	46,032
Mortgage-Backed Securities, Issued by Private Enterprises [Member]
AFS investment securities
Debt Securities, Available-for-Sale, Amortized Cost	0
Debt Securities, Available-for-sale	0
HTM investment securities
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	302,817	324,182
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	0	8,135
Held-to-maturity, Gross Unrealized Loss	(43,990)	(65,963)
Debt Securities, Held-to-Maturity, Fair Value	258,827	266,353
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
AFS investment securities
Debt Securities, Available-for-Sale, Amortized Cost	95,977	108,319
Debt Securities, Available-for-Sale, Unrealized Gain	19	123
Debt Securities, Available-for-sale, Unrealized Loss	(950)	(604)
Debt Securities, Available-for-sale	95,046	107,839
HTM investment securities
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Debt Securities, Held-to-Maturity, Fair Value	0
US Government-sponsored Enterprises Debt Securities [Member]
AFS investment securities
Debt Securities, Available-for-Sale, Amortized Cost	283	495
Debt Securities, Available-for-Sale, Unrealized Gain	0	0
Debt Securities, Available-for-sale, Unrealized Loss	(14)	(24)
Debt Securities, Available-for-sale	269	471
HTM investment securities
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Debt Securities, Held-to-Maturity, Fair Value	0
Other Debt Obligations [Member]
AFS investment securities
Debt Securities, Available-for-Sale, Amortized Cost	3,000	3,000
Debt Securities, Available-for-Sale, Unrealized Gain	0	0
Debt Securities, Available-for-sale, Unrealized Loss	(2)	(11)
Debt Securities, Available-for-sale	$ 2,998	$ 2,989

Amortized cost of 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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