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Securities - Schedule of Available-for-sale and Held-to-maturity Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
AFS debt securities: |  |
Amortized Cost | $ 6,879,225 | $ 10,087,179
Gross Unrealized Gains |  | 51,025
Gross Unrealized Losses |  | (172,851)
Fair Value | 6,034,993 | 9,965,353
HTM debt securities |  |
Amortized Cost | 3,001,868 | 0
Fair Value | 2,455,171 |
Total debt securities |  |
Amortized Cost | 9,881,093 |
Gross Unrealized Gains | 498 |
Gross Unrealized Losses | (1,391,427) |
Fair Value | 8,490,164 |
Debt securities available for sale |  |
AFS debt securities: |  |
Amortized Cost | 6,879,225 |
Gross Unrealized Gains | 498 |
Gross Unrealized Losses | (844,730) |
Fair Value | 6,034,993 |
Held-to-Maturity Securities |  |
HTM debt securities |  |
Amortized Cost | 3,001,868 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (546,697) |
Fair Value | 2,455,171 |
U.S. Treasury securities |  |
AFS debt securities: |  |
Amortized Cost | 676,306 | 1,049,238
Gross Unrealized Gains |  | 130
Gross Unrealized Losses |  | (16,687)
Fair Value |  | 1,032,681
U.S. Treasury securities | Debt securities available for sale |  |
AFS debt securities: |  |
Amortized Cost | 676,306 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (70,103) |
Fair Value | 606,203 |
U.S. Treasury securities | Held-to-Maturity Securities |  |
HTM debt securities |  |
Amortized Cost | 524,081 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (52,612) |
Fair Value | 471,469 |
U.S. government agency and U.S. government-sponsored enterprise debt securities |  |
AFS debt securities: |  |
Amortized Cost | 517,806 | 1,333,984
Gross Unrealized Gains |  | 2,697
Gross Unrealized Losses |  | (34,710)
Fair Value |  | 1,301,971
U.S. government agency and U.S. government-sponsored enterprise debt securities | Debt securities available for sale |  |
AFS debt securities: |  |
Amortized Cost | 517,806 |
Gross Unrealized Gains | 67 |
Gross Unrealized Losses | (56,266) |
Fair Value | 461,607 |
U.S. government agency and U.S. government-sponsored enterprise debt securities | Held-to-Maturity Securities |  |
HTM debt securities |  |
Amortized Cost | 998,972 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (209,560) |
Fair Value | 789,412 |
US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
AFS debt securities: |  |
Amortized Cost |  | 1,242,043
Gross Unrealized Gains |  | 15,791
Gross Unrealized Losses |  | (28,854)
Fair Value |  | 1,228,980
US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities | Debt securities available for sale |  |
AFS debt securities: |  |
Amortized Cost | 577,392 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (77,123) |
Fair Value | 500,269 |
US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities | Held-to-Maturity Securities |  |
HTM debt securities |  |
Amortized Cost | 506,965 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (98,566) |
Fair Value | 408,399 |
US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
AFS debt securities: |  |
Amortized Cost |  | 2,968,789
Gross Unrealized Gains |  | 8,629
Gross Unrealized Losses |  | (49,135)
Fair Value |  | 2,928,283
US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities | Debt securities available for sale |  |
AFS debt securities: |  |
Amortized Cost | 2,011,054 |
Gross Unrealized Gains | 41 |
Gross Unrealized Losses | (248,900) |
Fair Value | 1,762,195 |
US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities | Held-to-Maturity Securities |  |
HTM debt securities |  |
Amortized Cost | 782,141 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (148,230) |
Fair Value | 633,911 |
Municipal securities: |  |
AFS debt securities: |  |
Amortized Cost | 303,884 | 519,381
Gross Unrealized Gains |  | 10,065
Gross Unrealized Losses |  | (6,288)
Fair Value |  | 523,158
Municipal securities: | Debt securities available for sale |  |
AFS debt securities: |  |
Amortized Cost | 303,884 |
Gross Unrealized Gains | 3 |
Gross Unrealized Losses | (46,788) |
Fair Value | 257,099 |
Municipal securities: | Held-to-Maturity Securities |  |
HTM debt securities |  |
Amortized Cost | 189,709 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (37,729) |
Fair Value | 151,980 |
Non-agency commercial mortgage-backed Securities |  |
AFS debt securities: |  |
Amortized Cost |  | 498,920
Gross Unrealized Gains |  | 3,000
Gross Unrealized Losses |  | (5,477)
Fair Value |  | 496,443
Non-agency commercial mortgage-backed Securities | Debt securities available for sale |  |
AFS debt securities: |  |
Amortized Cost | 447,512 |
Gross Unrealized Gains | 213 |
Gross Unrealized Losses | (49,396) |
Fair Value | 398,329 |
Non-agency residential mortgage-backed Securities |  |
AFS debt securities: |  |
Amortized Cost |  | 889,937
Gross Unrealized Gains |  | 971
Gross Unrealized Losses |  | (8,977)
Fair Value |  | 881,931
Non-agency residential mortgage-backed Securities | Debt securities available for sale |  |
AFS debt securities: |  |
Amortized Cost | 762,202 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (112,978) |
Fair Value | 649,224 |
Corporate debt securities |  |
AFS debt securities: |  |
Amortized Cost | 673,502 | 657,516
Gross Unrealized Gains |  | 8,738
Gross Unrealized Losses |  | (16,589)
Fair Value |  | 649,665
Corporate debt securities | Debt securities available for sale |  |
AFS debt securities: |  |
Amortized Cost | 673,502 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (147,228) |
Fair Value | 526,274 |
Foreign government bonds |  |
AFS debt securities: |  |
Amortized Cost | 241,165 | 260,447
Gross Unrealized Gains |  | 767
Gross Unrealized Losses |  | (3,481)
Fair Value |  | 257,733
Foreign government bonds | Debt securities available for sale |  |
AFS debt securities: |  |
Amortized Cost | 241,165 |
Gross Unrealized Gains | 174 |
Gross Unrealized Losses | (14,286) |
Fair Value | 227,053 |
Asset-backed securities |  |
AFS debt securities: |  |
Amortized Cost | 51,152 | 74,674
Gross Unrealized Gains |  | 185
Gross Unrealized Losses |  | (301)
Fair Value |  | 74,558
Asset-backed securities | Debt securities available for sale |  |
AFS debt securities: |  |
Amortized Cost | 51,152 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (2,076) |
Fair Value | 49,076 |
CLOs |  |
AFS debt securities: |  |
Amortized Cost | 617,250 | 592,250
Gross Unrealized Gains |  | 52
Gross Unrealized Losses |  | (2,352)
Fair Value |  | $ 589,950
CLOs | Debt securities available for sale |  |
AFS debt securities: |  |
Amortized Cost | 617,250 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (19,586) |
Fair Value | $ 597,664 |

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