Investment Securities, AFS and HTM Contractual Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 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	3,040
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	1,390
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	5,007,880	$ 4,605,954
Fair Value
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	998
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	3,029
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	1,390
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	573
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	5,991
Available for Sale, Total debt securities	$ 5,036,508	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	$ 7,686
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five	89,077
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10	219,972
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10	1,327,280
Held to Maturity, Total Debt Securities	1,644,015
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,672,161	3,738,747
Fair Value
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	7,679
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	88,681
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	211,472
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	1,135,150
Held to Maturity, Securities, Debt Securities	1,442,982
Debt Securities, Held-to-Maturity, Fair Value	$ 3,140,331	3,185,494
Ratio of Fair Value to Amortized Cost, HTM	85.50%
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	313,439	324,182
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	262,536	266,353
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Amortized Cost
Available for Sale, Total debt securities	102,177	108,319
Fair Value
Available for Sale, Total debt securities	100,489	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
Available for Sale, Total debt securities	394	495
Fair Value
Available for Sale, Total debt securities	377	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
US Government Sponsored-Enterprise Insured Loans \| Residential Mortgage-Backed Securities [Member]
Amortized Cost
Available for Sale, Total debt securities	126,138	120,272
Fair Value
Available for Sale, Total debt securities	119,914	110,928
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	854,777	885,476
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	707,296	721,946
US Government Sponsored-Enterprise Insured Loans \| Commercial Mortgage-Backed Securities [Member]
Amortized Cost
Available for Sale, Total debt securities	18,147	18,332
Fair Value
Available for Sale, Total debt securities	16,937	17,000
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	768,503	772,456
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	644,422	623,595
Government National Mortgage Association (GNMA) [Member] \| Residential Mortgage-Backed Securities [Member]
Amortized Cost
Available for Sale, Total debt securities	4,640,079	4,236,199
Fair Value
Available for Sale, Total debt securities	4,682,415	4,227,727
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	42,028	43,693
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	39,136	39,927
Government National Mortgage Association (GNMA) [Member] \| Commercial Mortgage-Backed Securities [Member]
Amortized Cost
Available for Sale, Total debt securities	114,881	116,275
Fair Value
Available for Sale, Total debt securities	110,386	111,475
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	49,399	52,219
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	$ 43,959	$ 46,032

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