Investment Securities, AFS and HTM Contractual Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One	$ 3,750
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five	7,739
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	2,603
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost	14,092
Available for Sale, Total debt securities	6,411,899	$ 5,367,813
Fair Value
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	2,063
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	7,655
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	2,585
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	12,303
Available for Sale, Total debt securities	$ 6,366,586	5,397,563
Ratio of Fair Value to Amortized Cost, AFS	99.30%
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One	$ 820,235
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five	825
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10	8,078
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10	763,540
Held to Maturity, Total Debt Securities	1,592,678
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,510,775	3,602,576
Fair Value
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	818,331
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	779
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	7,932
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	642,564
Held to Maturity, Securities, Debt Securities	1,469,606
Debt Securities, Held-to-Maturity, Fair Value	$ 3,091,818	3,190,994
Ratio of Fair Value to Amortized Cost, HTM	88.10%
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	292,007	302,817
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	246,460	258,827
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Amortized Cost
Available for Sale, Total debt securities	89,197	95,977
Fair Value
Available for Sale, Total debt securities	88,212	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	120,221	283
Fair Value
Available for Sale, Total debt securities	120,070	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	142,709	134,142
Fair Value
Available for Sale, Total debt securities	137,288	129,863
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	790,729	823,630
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	660,737	696,462
US Government Sponsored-Enterprise Insured Loans \| Commercial Mortgage-Backed Securities [Member]
Amortized Cost
Available for Sale, Total debt securities	414,880	17,959
Fair Value
Available for Sale, Total debt securities	410,221	16,958
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	757,723	763,370
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	644,300	650,366
Government National Mortgage Association (GNMA) [Member] \| Residential Mortgage-Backed Securities [Member]
Amortized Cost
Available for Sale, Total debt securities	5,518,890	5,000,015
Fair Value
Available for Sale, Total debt securities	5,491,648	5,039,829
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	37,215	39,123
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	34,626	36,884
Government National Mortgage Association (GNMA) [Member] \| Commercial Mortgage-Backed Securities [Member]
Amortized Cost
Available for Sale, Total debt securities	111,910	113,374
Fair Value
Available for Sale, Total debt securities	106,844	109,556
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	40,423	44,552
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	$ 36,089	$ 40,138

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