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Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
AFS investment securities |  |
Debt Securities, Available-for-Sale, Amortized Cost | $ 4,605,954 | $ 3,749,814
Debt Securities, Available-for-Sale, Unrealized Gain | 5,693 | 24,579
Debt Securities, Available-for-sale, Unrealized Loss | (30,213) | (173,501)
Debt Securities, Available-for-sale | 4,581,434 | 3,600,892
HTM investment securities |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 3,738,747 | 3,860,235
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain | 42,653 | 55,619
Held-to-maturity, Gross Unrealized Loss | (595,906) | (535,230)
Debt Securities, Held-to-Maturity, Fair Value | 3,185,494 | 3,380,624
US Treasury Securities [Member] |  |
AFS investment securities |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 39,984
Debt Securities, Available-for-Sale, Unrealized Gain |  | 0
Debt Securities, Available-for-sale, Unrealized Loss |  | (4,083)
Debt Securities, Available-for-sale |  | 35,902
HTM investment securities |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 1,000 | 999
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain | 0 | 0
Held-to-maturity, Gross Unrealized Loss | (1) | (36)
Debt Securities, Held-to-Maturity, Fair Value | 999 | 963
US States and Political Subdivisions Debt Securities [Member] |  |
AFS investment securities |  |
Debt Securities, Available-for-Sale, Amortized Cost | 3,063 | 94,008
Debt Securities, Available-for-Sale, Unrealized Gain | 0 | 23
Debt Securities, Available-for-sale, Unrealized Loss | (58) | (2,214)
Debt Securities, Available-for-sale | 3,005 | 91,817
HTM investment securities |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 1,659,722 | 1,682,473
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain | 1,122 | 5,638
Held-to-maturity, Gross Unrealized Loss | (174,202) | (134,053)
Debt Securities, Held-to-Maturity, Fair Value | 1,486,642 | 1,554,059
Residential Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans [Member] |  |
AFS investment securities |  |
Debt Securities, Available-for-Sale, Amortized Cost | 120,272 | 1,274,052
Debt Securities, Available-for-Sale, Unrealized Gain | 190 | 294
Debt Securities, Available-for-sale, Unrealized Loss | (9,534) | (153,552)
Debt Securities, Available-for-sale | 110,928 | 1,120,794
HTM investment securities |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 885,476 | 941,973
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain | 22,934 | 27,007
Held-to-maturity, Gross Unrealized Loss | (186,464) | (164,587)
Debt Securities, Held-to-Maturity, Fair Value | 721,946 | 804,393
Residential Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member] |  |
AFS investment securities |  |
Debt Securities, Available-for-Sale, Amortized Cost | 4,236,199 | 2,021,242
Debt Securities, Available-for-Sale, Unrealized Gain | 5,379 | 24,254
Debt Securities, Available-for-sale, Unrealized Loss | (13,851) | (2,822)
Debt Securities, Available-for-sale | 4,227,727 | 2,042,675
HTM investment securities |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 43,693 | 48,979
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain | 9 | 92
Held-to-maturity, Gross Unrealized Loss | (3,774) | (2,901)
Debt Securities, Held-to-Maturity, Fair Value | 39,927 | 46,170
Commercial Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans [Member] |  |
AFS investment securities |  |
Debt Securities, Available-for-Sale, Amortized Cost | 18,332 | 18,691
Debt Securities, Available-for-Sale, Unrealized Gain | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss | (1,332) | (1,755)
Debt Securities, Available-for-sale | 17,000 | 16,937
HTM investment securities |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 772,456 | 780,995
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain | 10,217 | 12,699
Held-to-maturity, Gross Unrealized Loss | (159,078) | (160,781)
Debt Securities, Held-to-Maturity, Fair Value | 623,595 | 632,914
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member] |  |
AFS investment securities |  |
Debt Securities, Available-for-Sale, Amortized Cost | 116,275 | 161,928
Debt Securities, Available-for-Sale, Unrealized Gain | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss | (4,800) | (7,135)
Debt Securities, Available-for-sale | 111,475 | 154,793
HTM investment securities |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 52,219 | 59,733
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain | 236 | 386
Held-to-maturity, Gross Unrealized Loss | (6,424) | (7,500)
Debt Securities, Held-to-Maturity, Fair Value | 46,032 | 52,619
Mortgage-Backed Securities, Issued by Private Enterprises [Member] |  |
AFS investment securities |  |
Debt Securities, Available-for-Sale, Amortized Cost | 0 |
Debt Securities, Available-for-sale | 0 |
HTM investment securities |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 324,182 | 345,083
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain | 8,135 | 9,796
Held-to-maturity, Gross Unrealized Loss | (65,963) | (65,372)
Debt Securities, Held-to-Maturity, Fair Value | 266,353 | 289,507
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] |  |
AFS investment securities |  |
Debt Securities, Available-for-Sale, Amortized Cost | 108,319 | 135,832
Debt Securities, Available-for-Sale, Unrealized Gain | 123 | 5
Debt Securities, Available-for-sale, Unrealized Loss | (604) | (1,862)
Debt Securities, Available-for-sale | 107,839 | 133,975
HTM investment securities |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 0 |
Debt Securities, Held-to-Maturity, Fair Value | 0 |
US Government-sponsored Enterprises Debt Securities [Member] |  |
AFS investment securities |  |
Debt Securities, Available-for-Sale, Amortized Cost | 495 | 1,077
Debt Securities, Available-for-Sale, Unrealized Gain | 0 | 2
Debt Securities, Available-for-sale, Unrealized Loss | (24) | (28)
Debt Securities, Available-for-sale | 471 | 1,051
HTM investment securities |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 0 |
Debt Securities, Held-to-Maturity, Fair Value | 0 |
Other Debt Obligations [Member] |  |
AFS investment securities |  |
Debt Securities, Available-for-Sale, Amortized Cost | 3,000 | 3,000
Debt Securities, Available-for-Sale, Unrealized Gain | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss | (11) | (50)
Debt Securities, Available-for-sale | $ 2,989 | $ 2,950

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