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Investment Securities, AFS and HTM Expected Maturities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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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 |
Debt Securities, Available-for-Sale, Amortized Cost, Total | 4,605,954 | $ 3,749,814
Fair Value |  |
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One | 997 |
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 3,026 |
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 1,387 |
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 585 |
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value | 5,994 |
Total debt securities, AFS Fair Value | $ 4,581,434 | 3,600,892
Ratio of Fair Value to Amortized Cost, AFS | 99.50% |
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One | $ 17,800 |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five | 62,054 |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10 | 187,803 |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 | 1,393,065 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost | 1,660,722 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 3,738,747 | 3,860,235
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One | 17,746 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 61,286 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 179,653 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 1,228,957 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value | 1,487,641 |
Debt Securities, Held-to-Maturity, Fair Value | $ 3,185,494 | 3,380,624
Ratio of Fair Value to Amortized Cost, HTM | 85.20% |
Residential Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans [Member] |  |
Amortized Cost |  |
Debt Securities, Available-for-Sale, Amortized Cost, Total | $ 120,272 | 1,274,052
Fair Value |  |
Total debt securities, AFS Fair Value | 110,928 | 1,120,794
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 885,476 | 941,973
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | 721,946 | 804,393
Residential Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member] |  |
Amortized Cost |  |
Debt Securities, Available-for-Sale, Amortized Cost, Total | 4,236,199 | 2,021,242
Fair Value |  |
Total debt securities, AFS Fair Value | 4,227,727 | 2,042,675
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 43,693 | 48,979
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | 39,927 | 46,170
Mortgage-Backed Securities, Issued by Private Enterprises [Member] |  |
Amortized Cost |  |
Debt Securities, Available-for-Sale, Amortized Cost, Total | 0 |
Fair Value |  |
Total debt securities, AFS Fair Value | 0 |
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 324,182 | 345,083
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | 266,353 | 289,507
Commercial Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans [Member] |  |
Amortized Cost |  |
Debt Securities, Available-for-Sale, Amortized Cost, Total | 18,332 | 18,691
Fair Value |  |
Total debt securities, AFS Fair Value | 17,000 | 16,937
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 772,456 | 780,995
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | 623,595 | 632,914
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member] |  |
Amortized Cost |  |
Debt Securities, Available-for-Sale, Amortized Cost, Total | 116,275 | 161,928
Fair Value |  |
Total debt securities, AFS Fair Value | 111,475 | 154,793
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 52,219 | 59,733
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | 46,032 | 52,619
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] |  |
Amortized Cost |  |
Debt Securities, Available-for-Sale, Amortized Cost, Total | 108,319 | 135,832
Fair Value |  |
Total debt securities, AFS Fair Value | 107,839 | 133,975
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 |  |
Debt Securities, Available-for-Sale, Amortized Cost, Total | 495 | 1,077
Fair Value |  |
Total debt securities, AFS Fair Value | 471 | $ 1,051
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 |

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