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Securities - Schedule of Debt Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
AFS debt securities: |  |
Amortized Cost | $ 6,891,522 | $ 10,087,179
Gross Unrealized Gains | 1,340 | 51,025
Gross Unrealized Losses | (637,358) | (172,851)
Fair Value | 6,255,504 | 9,965,353
HTM debt securities: |  |
Amortized Cost | 3,028,302 | 0
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (371,753) |
Fair Value | 2,656,549 |
Total debt securities |  |
Amortized Cost | 9,919,824 |
Gross Unrealized Gains | 1,340 |
Gross Unrealized Losses | (1,009,111) |
Fair Value | 8,912,053 |
U.S. Treasury securities |  |
AFS debt securities: |  |
Amortized Cost | 676,320 | 1,049,238
Gross Unrealized Gains | 0 | 130
Gross Unrealized Losses | (51,634) | (16,687)
Fair Value | 624,686 | 1,032,681
HTM debt securities: |  |
Amortized Cost | 521,352 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (34,831) |
Fair Value | 486,521 |
U.S. government agency and U.S. government-sponsored enterprise debt securities |  |
AFS debt securities: |  |
Amortized Cost | 324,463 | 1,333,984
Gross Unrealized Gains | 0 | 2,697
Gross Unrealized Losses | (39,218) | (34,710)
Fair Value | 285,245 | 1,301,971
HTM debt securities: |  |
Amortized Cost | 997,369 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (144,291) |
Fair Value | 853,078 |
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
AFS debt securities: |  |
Amortized Cost | 614,135 | 1,242,043
Gross Unrealized Gains | 125 | 15,791
Gross Unrealized Losses | (50,428) | (28,854)
Fair Value | 563,832 | 1,228,980
HTM debt securities: |  |
Amortized Cost | 512,391 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (62,563) |
Fair Value | 449,828 |
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
AFS debt securities: |  |
Amortized Cost | 2,097,339 | 2,968,789
Gross Unrealized Gains | 193 | 8,629
Gross Unrealized Losses | (187,292) | (49,135)
Fair Value | 1,910,240 | 2,928,283
HTM debt securities: |  |
Amortized Cost | 807,111 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (96,637) |
Fair Value | 710,474 |
Municipal securities |  |
AFS debt securities: |  |
Amortized Cost | 306,419 | 519,381
Gross Unrealized Gains | 22 | 10,065
Gross Unrealized Losses | (39,708) | (6,288)
Fair Value | 266,733 | 523,158
HTM debt securities: |  |
Amortized Cost | 190,079 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (33,431) |
Fair Value | 156,648 |
Non-agency commercial mortgage-backed securities |  |
AFS debt securities: |  |
Amortized Cost | 451,200 | 498,920
Gross Unrealized Gains | 247 | 3,000
Gross Unrealized Losses | (39,679) | (5,477)
Fair Value | 411,768 | 496,443
Non-agency residential mortgage-backed securities |  |
AFS debt securities: |  |
Amortized Cost | 808,012 | 889,937
Gross Unrealized Gains | 0 | 971
Gross Unrealized Losses | (81,023) | (8,977)
Fair Value | 726,989 | 881,931
Corporate debt securities |  |
AFS debt securities: |  |
Amortized Cost | 673,502 | 657,516
Gross Unrealized Gains | 105 | 8,738
Gross Unrealized Losses | (114,314) | (16,589)
Fair Value | 559,293 | 649,665
Foreign government bonds |  |
AFS debt securities: |  |
Amortized Cost | 253,118 | 260,447
Gross Unrealized Gains | 648 | 767
Gross Unrealized Losses | (10,769) | (3,481)
Fair Value | 242,997 | 257,733
Asset-backed securities |  |
AFS debt securities: |  |
Amortized Cost | 69,764 | 74,674
Gross Unrealized Gains | 0 | 185
Gross Unrealized Losses | (2,414) | (301)
Fair Value | 67,350 | 74,558
Collateralized loan obligations (“CLOs”) |  |
AFS debt securities: |  |
Amortized Cost | 617,250 | 592,250
Gross Unrealized Gains | 0 | 52
Gross Unrealized Losses | (20,879) | (2,352)
Fair Value | $ 596,371 | $ 589,950

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