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Securities - Schedule of Debt Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
AFS debt securities: |  |
Amortized Cost | $ 9,644,377 | $ 6,916,491
Gross Unrealized Gains | 4,357 | 783
Gross Unrealized Losses | (725,206) | (728,937)
Fair Value | 8,923,528 | 6,188,337
HTM debt securities: |  |
Amortized Cost | 2,938,250 | 2,956,040
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (533,023) | (502,069)
Fair Value | 2,405,227 | 2,453,971
Total debt securities |  |
Amortized Cost | 12,582,627 | 9,872,531
Gross Unrealized Gains | 4,357 | 783
Gross Unrealized Losses | (1,258,229) | (1,231,006)
Fair Value | 11,328,755 | 8,642,308
AFS and HTM, accrued interest | 44,000 | 44,000
Government National Mortgage Association (GNMA) |  |
AFS debt securities: |  |
Amortized Cost | 5,200,000 | 1,300,000
Fair Value | 5,200,000 | 1,200,000
HTM debt securities: |  |
Amortized Cost | 89,000 | 92,000
Fair Value | 71,000 | 75,000
U.S. Treasury securities |  |
AFS debt securities: |  |
Amortized Cost | 676,291 | 1,112,587
Gross Unrealized Gains | 0 | 101
Gross Unrealized Losses | (52,534) | (52,313)
Fair Value | 623,757 | 1,060,375
HTM debt securities: |  |
Amortized Cost | 532,294 | 529,548
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (44,587) | (40,997)
Fair Value | 487,707 | 488,551
U.S. government agency and U.S. government-sponsored enterprise debt securities |  |
AFS debt securities: |  |
Amortized Cost | 309,956 | 412,086
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (49,568) | (47,640)
Fair Value | 260,388 | 364,446
HTM debt securities: |  |
Amortized Cost | 1,003,094 | 1,001,836
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (200,199) | (186,904)
Fair Value | 802,895 | 814,932
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
AFS debt securities: |  |
Amortized Cost | 498,281 | 531,377
Gross Unrealized Gains | 113 | 158
Gross Unrealized Losses | (53,547) | (63,276)
Fair Value | 444,847 | 468,259
HTM debt securities: |  |
Amortized Cost | 490,502 | 493,348
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (90,358) | (88,968)
Fair Value | 400,144 | 404,380
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
AFS debt securities: |  |
Amortized Cost | 5,956,800 | 1,956,927
Gross Unrealized Gains | 3,109 | 380
Gross Unrealized Losses | (241,091) | (229,713)
Fair Value | 5,718,818 | 1,727,594
HTM debt securities: |  |
Amortized Cost | 724,039 | 742,436
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (151,928) | (142,119)
Fair Value | 572,111 | 600,317
Municipal securities |  |
AFS debt securities: |  |
Amortized Cost | 295,437 | 297,283
Gross Unrealized Gains | 34 | 75
Gross Unrealized Losses | (38,908) | (36,342)
Fair Value | 256,563 | 261,016
HTM debt securities: |  |
Amortized Cost | 188,321 | 188,872
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (45,951) | (43,081)
Fair Value | 142,370 | 145,791
Non-agency commercial mortgage-backed securities |  |
AFS debt securities: |  |
Amortized Cost | 360,613 | 409,578
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (39,976) | (42,062)
Fair Value | 320,637 | 367,516
Non-agency residential mortgage-backed securities |  |
AFS debt securities: |  |
Amortized Cost | 564,414 | 643,335
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (89,796) | (89,664)
Fair Value | 474,618 | 553,671
Corporate debt securities |  |
AFS debt securities: |  |
Amortized Cost | 653,501 | 653,501
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (146,371) | (151,076)
Fair Value | 507,130 | 502,425
Foreign government bonds |  |
AFS debt securities: |  |
Amortized Cost | 245,523 | 239,333
Gross Unrealized Gains | 1,101 | 69
Gross Unrealized Losses | (12,900) | (11,528)
Fair Value | 233,724 | 227,874
Asset-backed securities |  |
AFS debt securities: |  |
Amortized Cost | 39,061 | 43,234
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (468) | (934)
Fair Value | 38,593 | 42,300
Collateralized loan obligations (“CLOs”) |  |
AFS debt securities: |  |
Amortized Cost | 44,500 | 617,250
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (47) | (4,389)
Fair Value | $ 44,453 | $ 612,861

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