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Securities (Continuous Unrealized Losses) (Details) - USD ($) $ in Thousands | Jun. 30, 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 | $ 4,169,504 | $ 1,519,603
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (80,246) | (15,456)
Available-for-sale debt securities, 12 Months or More, Fair Value | 509,227 | 342,859
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (8,545) | (7,005)
Available-for-sale debt securities fair value, Total | 4,678,731 | 1,862,462
Available-for-sale debt securities, Gross Unrealized Loss, Total | (88,791) | (22,461)
U.S. Treasury securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 544,599 | 352,521
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (6,098) | (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 | 544,599 | 352,521
Available-for-sale debt securities, Gross Unrealized Loss, Total | (6,098) | (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 | 782,327 |
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (17,402) |
Available-for-sale debt securities, 12 Months or More, Fair Value | 23,776 |
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (1,200) |
Available-for-sale debt securities fair value, Total | 806,103 |
Available-for-sale debt securities, Gross Unrealized Loss, Total | (18,602) |
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 | 491,515 | 292,596
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (11,487) | (5,656)
Available-for-sale debt securities, 12 Months or More, Fair Value | 28,399 | 3,543
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (1,196) | (54)
Available-for-sale debt securities fair value, Total | 519,914 | 296,139
Available-for-sale debt securities, Gross Unrealized Loss, Total | (12,683) | (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 | 1,346,061 | 342,561
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (25,170) | (1,611)
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 | 1,346,061 | 342,561
Available-for-sale debt securities, Gross Unrealized Loss, Total | (25,170) | (1,611)
Municipal securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 108,695 | 24,529
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (1,637) | (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 | 108,695 | 24,529
Available-for-sale debt securities, Gross Unrealized Loss, Total | (1,637) | (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 | 102,043 | 58,738
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (1,806) | (1,230)
Available-for-sale debt securities, 12 Months or More, Fair Value | 15,579 | 7,920
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (8) | 0
Available-for-sale debt securities fair value, Total | 117,622 | 66,658
Available-for-sale debt securities, Gross Unrealized Loss, Total | (1,814) | (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 | 464,404 | 90,156
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (2,216) | (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 | 464,404 | 90,156
Available-for-sale debt securities, Gross Unrealized Loss, Total | (2,216) | (506)
Corporate debt securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 254,723 | 251,674
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (11,277) | (3,645)
Available-for-sale debt securities, 12 Months or More, Fair Value | 57,100 | 9,798
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (2,900) | (203)
Available-for-sale debt securities fair value, Total | 311,823 | 261,472
Available-for-sale debt securities, Gross Unrealized Loss, Total | (14,177) | (3,848)
Foreign government bonds |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 59,189 | 106,828
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (3,146) | (1,460)
Available-for-sale debt securities, 12 Months or More, Fair Value | 92,844 | 0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (770) | 0
Available-for-sale debt securities fair value, Total | 152,033 | 106,828
Available-for-sale debt securities, Gross Unrealized Loss, Total | (3,916) | (1,460)
Asset-backed securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 15,948 | 0
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (7) | 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 | 15,948 | 34,104
Available-for-sale debt securities, Gross Unrealized Loss, Total | (7) | (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 | 291,529 | 287,494
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (2,471) | (6,506)
Available-for-sale debt securities fair value, Total | 291,529 | 287,494
Available-for-sale debt securities, Gross Unrealized Loss, Total | $ (2,471) | $ (6,506)

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