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Securities - Continuous Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | $ 1,451,466 | $ 5,932,965
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (104,682) | (106,229)
Available-for-sale debt securities, More than 12 Months, Fair Value | 4,332,275 | 1,778,987
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (740,048) | (66,622)
Available-for-sale debt securities, Fair Value, Total | 5,783,741 | 7,711,952
Available-for-sale debt securities, Gross Unrealized Loss, Total | (844,730) | (172,851)
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 131,843 | 935,776
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (8,761) | (14,689)
Available-for-sale debt securities, More than 12 Months, Fair Value | 474,360 | 47,881
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (61,342) | (1,998)
Available-for-sale debt securities, Fair Value, Total | 606,203 | 983,657
Available-for-sale debt securities, Gross Unrealized Loss, Total | (70,103) | (16,687)
U.S. government agency and U.S. government-sponsored enterprise debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 97,403 | 773,647
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (6,902) | (18,000)
Available-for-sale debt securities, More than 12 Months, Fair Value | 214,136 | 402,907
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (49,364) | (16,710)
Available-for-sale debt securities, Fair Value, Total | 311,539 | 1,176,554
Available-for-sale debt securities, Gross Unrealized Loss, Total | (56,266) | (34,710)
US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 252,144 | 440,734
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (30,029) | (13,589)
Available-for-sale debt securities, More than 12 Months, Fair Value | 248,125 | 257,745
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (47,094) | (15,265)
Available-for-sale debt securities, Fair Value, Total | 500,269 | 698,479
Available-for-sale debt securities, Gross Unrealized Loss, Total | (77,123) | (28,854)
US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 307,536 | 2,138,542
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (20,346) | (37,691)
Available-for-sale debt securities, More than 12 Months, Fair Value | 1,448,658 | 330,522
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (228,554) | (11,444)
Available-for-sale debt securities, Fair Value, Total | 1,756,194 | 2,469,064
Available-for-sale debt securities, Gross Unrealized Loss, Total | (248,900) | (49,135)
Municipal securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 95,655 | 177,065
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (10,194) | (5,682)
Available-for-sale debt securities, More than 12 Months, Fair Value | 159,439 | 17,003
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (36,594) | (606)
Available-for-sale debt securities, Fair Value, Total | 255,094 | 194,068
Available-for-sale debt securities, Gross Unrealized Loss, Total | (46,788) | (6,288)
Non-agency commercial mortgage-backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 106,184 | 301,925
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (3,309) | (4,158)
Available-for-sale debt securities, More than 12 Months, Fair Value | 282,301 | 40,013
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (46,087) | (1,319)
Available-for-sale debt securities, Fair Value, Total | 388,485 | 341,938
Available-for-sale debt securities, Gross Unrealized Loss, Total | (49,396) | (5,477)
Non-agency residential mortgage-backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 22,715 | 707,792
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (1,546) | (8,966)
Available-for-sale debt securities, More than 12 Months, Fair Value | 626,509 | 6,431
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (111,432) | (11)
Available-for-sale debt securities, Fair Value, Total | 649,224 | 714,223
Available-for-sale debt securities, Gross Unrealized Loss, Total | (112,978) | (8,977)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 173,595 | 183,916
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (17,907) | (3,084)
Available-for-sale debt securities, More than 12 Months, Fair Value | 352,679 | 251,494
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (129,321) | (13,505)
Available-for-sale debt securities, Fair Value, Total | 526,274 | 435,410
Available-for-sale debt securities, Gross Unrealized Loss, Total | (147,228) | (16,589)
Foreign government bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 107,576 | 27,097
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (429) | (5)
Available-for-sale debt securities, More than 12 Months, Fair Value | 36,143 | 133,279
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (13,857) | (3,476)
Available-for-sale debt securities, Fair Value, Total | 143,719 | 160,376
Available-for-sale debt securities, Gross Unrealized Loss, Total | (14,286) | (3,481)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 12,450 | 24,885
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (524) | (301)
Available-for-sale debt securities, More than 12 Months, Fair Value | 36,626 | 0
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (1,552) | 0
Available-for-sale debt securities, Fair Value, Total | 49,076 | 24,885
Available-for-sale debt securities, Gross Unrealized Loss, Total | (2,076) | (301)
Collateralized loan obligations (“CLOs”) |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 144,365 | 221,586
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (4,735) | (64)
Available-for-sale debt securities, More than 12 Months, Fair Value | 453,299 | 291,712
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (14,851) | (2,288)
Available-for-sale debt securities, Fair Value, Total | 597,664 | 513,298
Available-for-sale debt securities, Gross Unrealized Loss, Total | $ (19,586) | $ (2,352)

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