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Securities (Continuous Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | $ 1,506,992 | $ 1,388,661
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (23,670) | (18,990)
Available-for-sale debt securities, 12 Months or More, Fair Value | 90,974 | 351,048
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (1,777) | (4,249)
Available-for-sale debt securities Fair Value, Total | 1,597,966 | 1,739,709
Available-for-sale debt securities, Gross Unrealized Loss, Total | (25,447) | (23,239)
U.S. Treasury securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value |  | 0
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months |  | 0
Available-for-sale debt securities, 12 Months or More, Fair Value |  | 176,422
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More |  | (793)
Available-for-sale debt securities Fair Value, Total |  | 176,422
Available-for-sale debt securities, Gross Unrealized Loss, Total |  | (793)
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 | 336,399 | 310,349
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (2,410) | (4,407)
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 | 336,399 | 310,349
Available-for-sale debt securities, Gross Unrealized Loss, Total | (2,410) | (4,407)
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 | 224,593 | 204,675
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (4,194) | (2,346)
Available-for-sale debt securities, 12 Months or More, Fair Value | 10,456 | 108,314
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (67) | (2,548)
Available-for-sale debt securities Fair Value, Total | 235,049 | 312,989
Available-for-sale debt securities, Gross Unrealized Loss, Total | (4,261) | (4,894)
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 | 62,150 | 325,354
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (1,057) | (1,234)
Available-for-sale debt securities, 12 Months or More, Fair Value | 0 | 34,337
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | 0 | (243)
Available-for-sale debt securities Fair Value, Total | 62,150 | 359,691
Available-for-sale debt securities, Gross Unrealized Loss, Total | (1,057) | (1,477)
Municipal securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 151,283 | 31,130
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (1,346) | (109)
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 | 151,283 | 31,130
Available-for-sale debt securities, Gross Unrealized Loss, Total | (1,346) | (109)
Non-agency commercial mortgage-backed securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 66,469 | 7,914
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (1,210) | (6)
Available-for-sale debt securities, 12 Months or More, Fair Value | 7,907 | 0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (13) | 0
Available-for-sale debt securities Fair Value, Total | 74,376 | 7,914
Available-for-sale debt securities, Gross Unrealized Loss, Total | (1,223) | (6)
Non-agency residential mortgage-backed securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 135,192 | 42,894
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (475) | (285)
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 | 135,192 | 42,894
Available-for-sale debt securities, Gross Unrealized Loss, Total | (475) | (285)
Corporate debt securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 145,134 | 0
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (866) | 0
Available-for-sale debt securities, 12 Months or More, Fair Value | 9,463 | 9,888
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (537) | (113)
Available-for-sale debt securities Fair Value, Total | 154,597 | 9,888
Available-for-sale debt securities, Gross Unrealized Loss, Total | (1,403) | (113)
Foreign government bonds |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 102,350 | 129,074
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (1,534) | (407)
Available-for-sale debt securities, 12 Months or More, Fair Value | 0 | 9,900
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | 0 | (100)
Available-for-sale debt securities Fair Value, Total | 102,350 | 138,974
Available-for-sale debt securities, Gross Unrealized Loss, Total | (1,534) | (507)
Asset-backed securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 0 | 52,565
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | 0 | (902)
Available-for-sale debt securities, 12 Months or More, Fair Value | 63,148 | 12,187
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (1,160) | (452)
Available-for-sale debt securities Fair Value, Total | 63,148 | 64,752
Available-for-sale debt securities, Gross Unrealized Loss, Total | (1,160) | (1,354)
Collateralized loan obligations (“CLOs”) |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 283,422 | 284,706
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (10,578) | (9,294)
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 | 283,422 | 284,706
Available-for-sale debt securities, Gross Unrealized Loss, Total | $ (10,578) | $ (9,294)

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