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Securities - Schedule of Debt Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
AFS debt securities: |  |
Amortized Cost | $ 12,962,469 | $ 11,505,775
Gross Unrealized Gains | 27,372 | 15,273
Gross Unrealized Losses | (604,929) | (674,237)
Fair Value | 12,384,912 | 10,846,811
HTM debt securities: |  |
Amortized Cost | 2,905,341 | 2,917,413
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (470,049) | (529,659)
Fair Value | 2,435,292 | 2,387,754
Total debt securities |  |
Amortized Cost | 15,867,810 | 14,423,188
Gross Unrealized Gains | 27,372 | 15,273
Gross Unrealized Losses | (1,074,978) | (1,203,896)
Fair Value | 14,820,204 | 13,234,565
AFS and HTM, accrued interest | 44,000 | 45,000
Government National Mortgage Association (GNMA) |  |
AFS debt securities: |  |
Amortized Cost | 8,600,000 | 7,300,000
Fair Value | 8,500,000 | 7,200,000
HTM debt securities: |  |
Amortized Cost | 84,000 | 86,000
Fair Value | 68,000 | 68,000
U.S. Treasury securities |  |
AFS debt securities: |  |
Amortized Cost | 961,291 | 676,300
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (30,310) | (38,035)
Fair Value | 930,981 | 638,265
HTM debt securities: |  |
Amortized Cost | 536,459 | 535,080
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (27,846) | (35,222)
Fair Value | 508,613 | 499,858
U.S. government agency and U.S. government-sponsored enterprise debt securities |  |
AFS debt securities: |  |
Amortized Cost | 306,428 | 308,220
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (38,022) | (45,633)
Fair Value | 268,406 | 262,587
HTM debt securities: |  |
Amortized Cost | 1,005,347 | 1,004,479
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (173,991) | (200,259)
Fair Value | 831,356 | 804,220
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
AFS debt securities: |  |
Amortized Cost | 455,534 | 472,535
Gross Unrealized Gains | 2,616 | 886
Gross Unrealized Losses | (39,600) | (47,207)
Fair Value | 418,550 | 426,214
HTM debt securities: |  |
Amortized Cost | 481,507 | 486,388
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (78,425) | (91,461)
Fair Value | 403,082 | 394,927
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
AFS debt securities: |  |
Amortized Cost | 9,204,823 | 7,974,768
Gross Unrealized Gains | 23,770 | 12,278
Gross Unrealized Losses | (223,031) | (248,786)
Fair Value | 9,005,562 | 7,738,260
HTM debt securities: |  |
Amortized Cost | 694,808 | 703,833
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (141,240) | (155,626)
Fair Value | 553,568 | 548,207
Municipal securities |  |
AFS debt securities: |  |
Amortized Cost | 286,374 | 287,301
Gross Unrealized Gains | 0 | 38
Gross Unrealized Losses | (40,520) | (37,186)
Fair Value | 245,854 | 250,153
HTM debt securities: |  |
Amortized Cost | 187,220 | 187,633
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (48,547) | (47,091)
Fair Value | 138,673 | 140,542
Non-agency commercial mortgage-backed securities |  |
AFS debt securities: |  |
Amortized Cost | 268,913 | 294,235
Gross Unrealized Gains | 1 | 2
Gross Unrealized Losses | (32,314) | (35,767)
Fair Value | 236,600 | 258,470
Non-agency residential mortgage-backed securities |  |
AFS debt securities: |  |
Amortized Cost | 502,410 | 514,527
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (72,342) | (80,919)
Fair Value | 430,068 | 433,608
Corporate debt securities |  |
AFS debt securities: |  |
Amortized Cost | 653,500 | 653,500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (116,958) | (127,334)
Fair Value | 536,542 | 526,166
Foreign government bonds |  |
AFS debt securities: |  |
Amortized Cost | 244,459 | 244,803
Gross Unrealized Gains | 985 | 2,069
Gross Unrealized Losses | (11,253) | (12,992)
Fair Value | 234,191 | 233,880
Asset-backed securities |  |
AFS debt securities: |  |
Amortized Cost | 34,237 | 35,086
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (502) | (371)
Fair Value | 33,735 | 34,715
Collateralized loan obligations (“CLOs”) |  |
AFS debt securities: |  |
Amortized Cost | 44,500 | 44,500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (77) | (7)
Fair Value | $ 44,423 | $ 44,493

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