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Investment Securities, AFS and HTM Contractual Maturities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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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 | 5,193,828 | $ 4,605,954
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 | 3,034 |
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 1,391 |
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 594 |
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value | 6,019 |
Available for Sale, Total debt securities | $ 5,217,278 | 4,581,434
Ratio of Fair Value to Amortized Cost, AFS | 100.50% |
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One | $ 4,384 |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five | 93,085 |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10 | 220,964 |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 | 1,319,880 |
Held to Maturity, Total Debt Securities | 1,638,313 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 3,636,139 | 3,738,747
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One | 4,385 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 93,182 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 217,504 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 1,171,339 |
Held to Maturity, Securities, Debt Securities | 1,486,410 |
Debt Securities, Held-to-Maturity, Fair Value | $ 3,182,394 | 3,185,494
Ratio of Fair Value to Amortized Cost, HTM | 87.50% |
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 | 307,569 | 324,182
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | 261,038 | 266,353
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] |  |
Amortized Cost |  |
Available for Sale, Total debt securities | 98,889 | 108,319
Fair Value |  |
Available for Sale, Total debt securities | 98,198 | 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 | 363 | 495
Fair Value |  |
Available for Sale, Total debt securities | 348 | 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 | 128,541 | 120,272
Fair Value |  |
Available for Sale, Total debt securities | 123,560 | 110,928
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 836,619 | 885,476
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | 705,725 | 721,946
US Government Sponsored-Enterprise Insured Loans | Commercial Mortgage-Backed Securities [Member] |  |
Amortized Cost |  |
Available for Sale, Total debt securities | 18,054 | 18,332
Fair Value |  |
Available for Sale, Total debt securities | 16,999 | 17,000
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 766,482 | 772,456
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | 649,352 | 623,595
Government National Mortgage Association (GNMA) [Member] | Residential Mortgage-Backed Securities [Member] |  |
Amortized Cost |  |
Available for Sale, Total debt securities | 4,827,672 | 4,236,199
Fair Value |  |
Available for Sale, Total debt securities | 4,862,225 | 4,227,727
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 40,301 | 43,693
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | 37,871 | 39,927
Government National Mortgage Association (GNMA) [Member] | Commercial Mortgage-Backed Securities [Member] |  |
Amortized Cost |  |
Available for Sale, Total debt securities | 114,247 | 116,275
Fair Value |  |
Available for Sale, Total debt securities | 109,930 | 111,475
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 46,855 | 52,219
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | $ 41,998 | $ 46,032

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