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Securities - Schedule of Debt Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
AFS debt securities: |  |
Amortized Cost | $ 11,505,775 | $ 6,916,491
Gross Unrealized Gains | 15,273 | 783
Gross Unrealized Losses | (674,237) | (728,937)
Fair Value | 10,846,811 | 6,188,337
HTM debt securities |  |
Amortized Cost | 2,917,413 | 2,956,040
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (529,659) | (502,069)
Fair Value | 2,387,754 | 2,453,971
Total debt securities |  |
Amortized Cost | 14,423,188 | 9,872,531
Gross Unrealized Gains | 15,273 | 783
Gross Unrealized Losses | (1,203,896) | (1,231,006)
Fair Value | 13,234,565 | 8,642,308
AFS and HTM, accrued interest | 45,000 | 44,000
Government National Mortgage Association (GNMA) |  |
AFS debt securities: |  |
Amortized Cost | 7,300,000 | 1,300,000
Fair Value | 7,200,000 | 1,200,000
HTM debt securities |  |
Amortized Cost | 86,000 | 92,000
Fair Value | 68,000 | 75,000
U.S. Treasury securities |  |
AFS debt securities: |  |
Amortized Cost | 676,300 | 1,112,587
Gross Unrealized Gains | 0 | 101
Gross Unrealized Losses | (38,035) | (52,313)
Fair Value | 638,265 | 1,060,375
HTM debt securities |  |
Amortized Cost | 535,080 | 529,548
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (35,222) | (40,997)
Fair Value | 499,858 | 488,551
U.S. government agency and U.S. government-sponsored enterprise debt securities |  |
AFS debt securities: |  |
Amortized Cost | 308,220 | 412,086
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (45,633) | (47,640)
Fair Value | 262,587 | 364,446
HTM debt securities |  |
Amortized Cost | 1,004,479 | 1,001,836
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (200,259) | (186,904)
Fair Value | 804,220 | 814,932
US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
AFS debt securities: |  |
Amortized Cost | 472,535 | 531,377
Gross Unrealized Gains | 886 | 158
Gross Unrealized Losses | (47,207) | (63,276)
Fair Value | 426,214 | 468,259
HTM debt securities |  |
Amortized Cost | 486,388 | 493,348
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (91,461) | (88,968)
Fair Value | 394,927 | 404,380
US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
AFS debt securities: |  |
Amortized Cost | 7,974,768 | 1,956,927
Gross Unrealized Gains | 12,278 | 380
Gross Unrealized Losses | (248,786) | (229,713)
Fair Value | 7,738,260 | 1,727,594
HTM debt securities |  |
Amortized Cost | 703,833 | 742,436
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (155,626) | (142,119)
Fair Value | 548,207 | 600,317
Municipal securities |  |
AFS debt securities: |  |
Amortized Cost | 287,301 | 297,283
Gross Unrealized Gains | 38 | 75
Gross Unrealized Losses | (37,186) | (36,342)
Fair Value | 250,153 | 261,016
HTM debt securities |  |
Amortized Cost | 187,633 | 188,872
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (47,091) | (43,081)
Fair Value | 140,542 | 145,791
Non-agency commercial mortgage-backed Securities |  |
AFS debt securities: |  |
Amortized Cost | 294,235 | 409,578
Gross Unrealized Gains | 2 | 0
Gross Unrealized Losses | (35,767) | (42,062)
Fair Value | 258,470 | 367,516
Non-agency residential mortgage-backed Securities |  |
AFS debt securities: |  |
Amortized Cost | 514,527 | 643,335
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (80,919) | (89,664)
Fair Value | 433,608 | 553,671
Corporate debt securities |  |
AFS debt securities: |  |
Amortized Cost | 653,500 | 653,501
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (127,334) | (151,076)
Fair Value | 526,166 | 502,425
Foreign government bonds |  |
AFS debt securities: |  |
Amortized Cost | 244,803 | 239,333
Gross Unrealized Gains | 2,069 | 69
Gross Unrealized Losses | (12,992) | (11,528)
Fair Value | 233,880 | 227,874
Asset-backed securities |  |
AFS debt securities: |  |
Amortized Cost | 35,086 | 43,234
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (371) | (934)
Fair Value | 34,715 | 42,300
Collateralized loan obligations (“CLOs”) |  |
AFS debt securities: |  |
Amortized Cost | 44,500 | 617,250
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (7) | (4,389)
Fair Value | $ 44,493 | $ 612,861

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