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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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