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Investment Securities, AFS and HTM Contractual Maturities (Details) - USD ($) $ in Thousands | Mar. 31, 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 | 4,789,259 | $ 4,605,954
Fair Value |  |
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One | 999 |
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 | 1,385 |
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 576 |
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value | 5,995 |
Available for Sale, Total debt securities | $ 4,796,570 | 4,581,434
Ratio of Fair Value to Amortized Cost, AFS | 100.20% |
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One | $ 11,023 |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five | 74,907 |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10 | 216,847 |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 | 1,347,262 |
Held to Maturity, Total Debt Securities | 1,650,039 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 3,705,857 | 3,738,747
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One | 10,999 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 74,159 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 207,000 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 1,163,656 |
Held to Maturity, Securities, Debt Securities | 1,455,814 |
Debt Securities, Held-to-Maturity, Fair Value | $ 3,174,170 | 3,185,494
Ratio of Fair Value to Amortized Cost, HTM | 85.70% |
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 | 320,057 | 324,182
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | 268,201 | 266,353
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] |  |
Amortized Cost |  |
Available for Sale, Total debt securities | 105,633 | 108,319
Fair Value |  |
Available for Sale, Total debt securities | 104,774 | 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 | 427 | 495
Fair Value |  |
Available for Sale, Total debt securities | 410 | 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 | 125,024 | 120,272
Fair Value |  |
Available for Sale, Total debt securities | 118,036 | 110,928
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 871,331 | 885,476
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | 723,822 | 721,946
US Government Sponsored-Enterprise Insured Loans | Commercial Mortgage-Backed Securities [Member] |  |
Amortized Cost |  |
Available for Sale, Total debt securities | 18,240 | 18,332
Fair Value |  |
Available for Sale, Total debt securities | 16,959 | 17,000
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 770,177 | 772,456
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | 640,734 | 623,595
Government National Mortgage Association (GNMA) [Member] | Residential Mortgage-Backed Securities [Member] |  |
Amortized Cost |  |
Available for Sale, Total debt securities | 4,418,218 | 4,236,199
Fair Value |  |
Available for Sale, Total debt securities | 4,438,964 | 4,227,727
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 42,972 | 43,693
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | 39,977 | 39,927
Government National Mortgage Association (GNMA) [Member] | Commercial Mortgage-Backed Securities [Member] |  |
Amortized Cost |  |
Available for Sale, Total debt securities | 115,654 | 116,275
Fair Value |  |
Available for Sale, Total debt securities | 111,433 | 111,475
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 51,281 | 52,219
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | $ 45,621 | $ 46,032

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