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Securities (Continuous Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | $ 5,932,965 | $ 1,519,603
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (106,229) | (15,456)
Available-for-sale debt securities, More than 12 Months, Fair Value | 1,778,987 | 342,859
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (66,622) | (7,005)
Available-for-sale debt securities, Fair Value, Total | 7,711,952 | 1,862,462
Available-for-sale debt securities, Gross Unrealized Loss, Total | (172,851) | (22,461)
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 935,776 | 352,521
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (14,689) | (1,260)
Available-for-sale debt securities, More than 12 Months, Fair Value | 47,881 | 0
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (1,998) | 0
Available-for-sale debt securities, Fair Value, Total | 983,657 | 352,521
Available-for-sale debt securities, Gross Unrealized Loss, Total | (16,687) | (1,260)
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 | 773,647 |
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (18,000) |
Available-for-sale debt securities, More than 12 Months, Fair Value | 402,907 |
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (16,710) |
Available-for-sale debt securities, Fair Value, Total | 1,176,554 |
Available-for-sale debt securities, Gross Unrealized Loss, Total | (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 | 440,734 | 292,596
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (13,589) | (5,656)
Available-for-sale debt securities, More than 12 Months, Fair Value | 257,745 | 3,543
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (15,265) | (54)
Available-for-sale debt securities, Fair Value, Total | 698,479 | 296,139
Available-for-sale debt securities, Gross Unrealized Loss, Total | (28,854) | (5,710)
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 | 2,138,542 | 342,561
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (37,691) | (1,611)
Available-for-sale debt securities, More than 12 Months, Fair Value | 330,522 | 0
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (11,444) | 0
Available-for-sale debt securities, Fair Value, Total | 2,469,064 | 342,561
Available-for-sale debt securities, Gross Unrealized Loss, Total | (49,135) | (1,611)
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 177,065 | 24,529
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (5,682) | (88)
Available-for-sale debt securities, More than 12 Months, Fair Value | 17,003 | 0
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (606) | 0
Available-for-sale debt securities, Fair Value, Total | 194,068 | 24,529
Available-for-sale debt securities, Gross Unrealized Loss, Total | (6,288) | (88)
Non-agency commercial mortgage-backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 301,925 | 58,738
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (4,158) | (1,230)
Available-for-sale debt securities, More than 12 Months, Fair Value | 40,013 | 7,920
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (1,319) | 0
Available-for-sale debt securities, Fair Value, Total | 341,938 | 66,658
Available-for-sale debt securities, Gross Unrealized Loss, Total | (5,477) | (1,230)
Non-agency residential mortgage-backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 707,792 | 90,156
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (8,966) | (506)
Available-for-sale debt securities, More than 12 Months, Fair Value | 6,431 | 0
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (11) | 0
Available-for-sale debt securities, Fair Value, Total | 714,223 | 90,156
Available-for-sale debt securities, Gross Unrealized Loss, Total | (8,977) | (506)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 183,916 | 251,674
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (3,084) | (3,645)
Available-for-sale debt securities, More than 12 Months, Fair Value | 251,494 | 9,798
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (13,505) | (203)
Available-for-sale debt securities, Fair Value, Total | 435,410 | 261,472
Available-for-sale debt securities, Gross Unrealized Loss, Total | (16,589) | (3,848)
Foreign government bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 27,097 | 106,828
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (5) | (1,460)
Available-for-sale debt securities, More than 12 Months, Fair Value | 133,279 | 0
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (3,476) | 0
Available-for-sale debt securities, Fair Value, Total | 160,376 | 106,828
Available-for-sale debt securities, Gross Unrealized Loss, Total | (3,481) | (1,460)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 24,885 | 0
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (301) | 0
Available-for-sale debt securities, More than 12 Months, Fair Value | 0 | 34,104
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | 0 | (242)
Available-for-sale debt securities, Fair Value, Total | 24,885 | 34,104
Available-for-sale debt securities, Gross Unrealized Loss, Total | (301) | (242)
Collateralized loan obligations (“CLOs”) |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 221,586 | 0
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (64) | 0
Available-for-sale debt securities, More than 12 Months, Fair Value | 291,712 | 287,494
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (2,288) | (6,506)
Available-for-sale debt securities, Fair Value, Total | 513,298 | 287,494
Available-for-sale debt securities, Gross Unrealized Loss, Total | $ (2,352) | $ (6,506)

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