Investment Securities, AFS and HTM Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
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
Available for Sale, Total debt securities	5,521,236	$ 5,367,813
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	4,421
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	597
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	6,018
Available for Sale, Total debt securities	$ 5,514,456	5,397,563
Ratio of Fair Value to Amortized Cost, AFS	99.90%
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One	$ 647,686
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five	1,862
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10	7,298
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10	963,072
Held to Maturity, Total Debt Securities	1,619,918
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,570,901	3,602,576
Fair Value
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	644,429
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	1,767
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	7,103
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	810,615
Held to Maturity, Securities, Debt Securities	1,463,914
Debt Securities, Held-to-Maturity, Fair Value	$ 3,122,449	3,190,994
Ratio of Fair Value to Amortized Cost, HTM	87.40%
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Amortized Cost
Available for Sale, Total debt securities	$ 0
Fair Value
Available for Sale, Total debt securities	0
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	298,196	302,817
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	253,234	258,827
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Amortized Cost
Available for Sale, Total debt securities	92,852	95,977
Fair Value
Available for Sale, Total debt securities	91,828	95,046
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
Available for Sale, Total debt securities	63,257	283
Fair Value
Available for Sale, Total debt securities	63,301	269
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-Enterprise Insured Loans \| Residential Mortgage-Backed Securities [Member]
Amortized Cost
Available for Sale, Total debt securities	136,572	134,142
Fair Value
Available for Sale, Total debt securities	131,583	129,863
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	811,047	823,630
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	681,846	696,462
US Government Sponsored-Enterprise Insured Loans \| Commercial Mortgage-Backed Securities [Member]
Amortized Cost
Available for Sale, Total debt securities	17,864	17,959
Fair Value
Available for Sale, Total debt securities	16,936	16,958
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	761,410	763,370
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	649,810	650,366
Government National Mortgage Association (GNMA) [Member] \| Residential Mortgage-Backed Securities [Member]
Amortized Cost
Available for Sale, Total debt securities	5,091,918	5,000,015
Fair Value
Available for Sale, Total debt securities	5,096,659	5,039,829
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	38,021	39,123
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	35,689	36,884
Government National Mortgage Association (GNMA) [Member] \| Commercial Mortgage-Backed Securities [Member]
Amortized Cost
Available for Sale, Total debt securities	112,710	113,374
Fair Value
Available for Sale, Total debt securities	108,131	109,556
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	42,309	44,552
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	$ 37,956	$ 40,138

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