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Securities- Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | $ 345,221 | $ 781,054
Investments with an unrealized loss of less than 12 months, unrealized losses | 6,979 | 7,851
Investments with an unrealized loss of 12 months or longer, fair value | 619,882 | 516,267
Investments with an unrealized loss of 12 months or longer, unrealized losses | 33,712 | 9,934
Total investments with an unrealized loss, fair value | 965,103 | 1,297,321
Total investments with an unrealized loss, unrealized losses | 40,691 | 17,785
U.S. Treasury securities |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 0 | 40,505
Investments with an unrealized loss of less than 12 months, unrealized losses | 0 | 14
Investments with an unrealized loss of 12 months or longer, fair value | 0 | 0
Investments with an unrealized loss of 12 months or longer, unrealized losses | 0 | 0
Total investments with an unrealized loss, fair value | 0 | 40,505
Total investments with an unrealized loss, unrealized losses | 0 | 14
U.S. government agency securities |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 0 | 1,222
Investments with an unrealized loss of less than 12 months, unrealized losses | 0 | 1
Investments with an unrealized loss of 12 months or longer, fair value | 6,507 | 30,892
Investments with an unrealized loss of 12 months or longer, unrealized losses | 32 | 709
Total investments with an unrealized loss, fair value | 6,507 | 32,114
Total investments with an unrealized loss, unrealized losses | 32 | 710
Mortgage-backed securities |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 59,233 | 458,881
Investments with an unrealized loss of less than 12 months, unrealized losses | 614 | 5,102
Investments with an unrealized loss of 12 months or longer, fair value | 43,978 | 163,767
Investments with an unrealized loss of 12 months or longer, unrealized losses | 773 | 2,674
Total investments with an unrealized loss, fair value | 103,211 | 622,648
Total investments with an unrealized loss, unrealized losses | 1,387 | 7,776
State and municipal securities |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 182,186 | 204,958
Investments with an unrealized loss of less than 12 months, unrealized losses | 3,557 | 1,938
Investments with an unrealized loss of 12 months or longer, fair value | 496,371 | 244,884
Investments with an unrealized loss of 12 months or longer, unrealized losses | 28,448 | 5,311
Total investments with an unrealized loss, fair value | 678,557 | 449,842
Total investments with an unrealized loss, unrealized losses | 32,005 | 7,249
Asset-backed securities |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 59,994 | 75,488
Investments with an unrealized loss of less than 12 months, unrealized losses | 1,260 | 796
Investments with an unrealized loss of 12 months or longer, fair value | 54,376 | 59,816
Investments with an unrealized loss of 12 months or longer, unrealized losses | 1,350 | 497
Total investments with an unrealized loss, fair value | 114,370 | 135,304
Total investments with an unrealized loss, unrealized losses | 2,610 | 1,293
Corporate notes |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 43,808 | 0
Investments with an unrealized loss of less than 12 months, unrealized losses | 1,548 | 0
Investments with an unrealized loss of 12 months or longer, fair value | 18,650 | 16,908
Investments with an unrealized loss of 12 months or longer, unrealized losses | 3,109 | 743
Total investments with an unrealized loss, fair value | 62,458 | 16,908
Total investments with an unrealized loss, unrealized losses | $ 4,657 | $ 743

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