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Securities (Continuous Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | $ 5,031,239 | $ 1,519,603
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (170,164) | (15,456)
Available-for-sale debt securities, 12 Months or More, Fair Value | 320,850 | 342,859
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (2,622) | (7,005)
Available-for-sale debt securities fair value, Total | 5,352,089 | 1,862,462
Available-for-sale debt securities, Gross Unrealized Loss, Total | (172,786) | (22,461)
U.S. Treasury securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 775,801 | 352,521
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (15,697) | (1,260)
Available-for-sale debt securities, 12 Months or More, Fair Value | 0 | 0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | 0 | 0
Available-for-sale debt securities fair value, Total | 775,801 | 352,521
Available-for-sale debt securities, Gross Unrealized Loss, Total | (15,697) | (1,260)
U.S. government agency and U.S. government-sponsored enterprise debt securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 954,894 |
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (47,586) |
Available-for-sale debt securities, 12 Months or More, Fair Value | 0 |
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | 0 |
Available-for-sale debt securities fair value, Total | 954,894 |
Available-for-sale debt securities, Gross Unrealized Loss, Total | (47,586) |
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 615,193 | 292,596
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (25,203) | (5,656)
Available-for-sale debt securities, 12 Months or More, Fair Value | 3,474 | 3,543
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (51) | (54)
Available-for-sale debt securities fair value, Total | 618,667 | 296,139
Available-for-sale debt securities, Gross Unrealized Loss, Total | (25,254) | (5,710)
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 1,464,574 | 342,561
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (41,264) | (1,611)
Available-for-sale debt securities, 12 Months or More, Fair Value | 358 | 0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (1) | 0
Available-for-sale debt securities fair value, Total | 1,464,932 | 342,561
Available-for-sale debt securities, Gross Unrealized Loss, Total | (41,265) | (1,611)
Municipal securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 199,225 | 24,529
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (4,959) | (88)
Available-for-sale debt securities, 12 Months or More, Fair Value | 0 | 0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | 0 | 0
Available-for-sale debt securities fair value, Total | 199,225 | 24,529
Available-for-sale debt securities, Gross Unrealized Loss, Total | (4,959) | (88)
Non-agency commercial mortgage-backed securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 114,971 | 58,738
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (4,374) | (1,230)
Available-for-sale debt securities, 12 Months or More, Fair Value | 15,578 | 7,920
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (9) | 0
Available-for-sale debt securities fair value, Total | 130,549 | 66,658
Available-for-sale debt securities, Gross Unrealized Loss, Total | (4,383) | (1,230)
Non-agency residential mortgage-backed securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 391,444 | 90,156
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (3,659) | (506)
Available-for-sale debt securities, 12 Months or More, Fair Value | 0 | 0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | 0 | 0
Available-for-sale debt securities fair value, Total | 391,444 | 90,156
Available-for-sale debt securities, Gross Unrealized Loss, Total | (3,659) | (506)
Corporate debt securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 347,934 | 251,674
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (25,316) | (3,645)
Available-for-sale debt securities, 12 Months or More, Fair Value | 9,974 | 9,798
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (27) | (203)
Available-for-sale debt securities fair value, Total | 357,908 | 261,472
Available-for-sale debt securities, Gross Unrealized Loss, Total | (25,343) | (3,848)
Foreign government bonds |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 155,299 | 106,828
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (2,092) | (1,460)
Available-for-sale debt securities, 12 Months or More, Fair Value | 0 | 0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | 0 | 0
Available-for-sale debt securities fair value, Total | 155,299 | 106,828
Available-for-sale debt securities, Gross Unrealized Loss, Total | (2,092) | (1,460)
Asset-backed securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 11,904 | 0
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (14) | 0
Available-for-sale debt securities, 12 Months or More, Fair Value | 0 | 34,104
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | 0 | (242)
Available-for-sale debt securities fair value, Total | 11,904 | 34,104
Available-for-sale debt securities, Gross Unrealized Loss, Total | (14) | (242)
Collateralized loan obligations (“CLOs”) |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 0 | 0
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | 0 | 0
Available-for-sale debt securities, 12 Months or More, Fair Value | 291,466 | 287,494
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (2,534) | (6,506)
Available-for-sale debt securities fair value, Total | 291,466 | 287,494
Available-for-sale debt securities, Gross Unrealized Loss, Total | $ (2,534) | $ (6,506)

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