Investment Securities, AFS and HTM Expected Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One	$ 1,000
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five	4,430
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	0
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10	633
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	6,063
Debt Securities, Available-for-Sale, Amortized Cost, Total	5,367,813	$ 4,605,954
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	3,602,519	3,738,687
Fair Value
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	1,000
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	4,422
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	0
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	620
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	6,042
Total debt securities, AFS Fair Value	$ 5,397,563	4,581,434
Ratio of Fair Value to Amortized Cost, AFS	100.60%
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One	$ 4,214
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five	99,077
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10	218,537
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10	1,307,256
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost	1,629,084
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,602,576	3,738,747
Fair Value
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	4,215
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	99,036
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	218,398
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	1,186,668
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value	1,508,317
Debt Securities, Held-to-Maturity, Fair Value	$ 3,190,994	3,185,494
Ratio of Fair Value to Amortized Cost, HTM	88.60%
Residential Mortgage-Backed Securities [Member] \| US Government Sponsored-Enterprise Insured Loans [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	$ 134,142	120,272
Fair Value
Total debt securities, AFS Fair Value	129,863	110,928
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	823,630	885,476
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	696,462	721,946
Residential Mortgage-Backed Securities [Member] \| Government National Mortgage Association (GNMA) [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	5,000,015	4,236,199
Fair Value
Total debt securities, AFS Fair Value	5,039,829	4,227,727
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	39,123	43,693
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	36,884	39,927
Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	0
Fair Value
Total debt securities, AFS Fair Value	0
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	302,817	324,182
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	258,827	266,353
Commercial Mortgage-Backed Securities [Member] \| US Government Sponsored-Enterprise Insured Loans [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	17,959	18,332
Fair Value
Total debt securities, AFS Fair Value	16,958	17,000
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	763,370	772,456
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	650,366	623,595
Commercial Mortgage-Backed Securities [Member] \| Government National Mortgage Association (GNMA) [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	113,374	116,275
Fair Value
Total debt securities, AFS Fair Value	109,556	111,475
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	44,552	52,219
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	40,138	46,032
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	95,977	108,319
Fair Value
Total debt securities, AFS Fair Value	95,046	107,839
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	0
US Government-sponsored Enterprises Debt Securities [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	283	495
Fair Value
Total debt securities, AFS Fair Value	269	$ 471
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	$ 0

Ratio of Fair Value to Amortized Cost, HTM

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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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