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Securities- Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 365,407 | $ 781,054
Investments with an unrealized loss of less than 12 months, unrealized losses | 17,559 | 7,851
Investments with an unrealized loss of 12 months or longer, fair value | 632,574 | 516,267
Investments with an unrealized loss of 12 months or longer, unrealized losses | 45,350 | 9,934
Total investments with an unrealized loss, fair value | 997,981 | 1,297,321
Total investments with an unrealized loss, unrealized losses | 62,909 | 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 | 26,858 | 30,892
Investments with an unrealized loss of 12 months or longer, unrealized losses | 1,072 | 709
Total investments with an unrealized loss, fair value | 26,858 | 32,114
Total investments with an unrealized loss, unrealized losses | 1,072 | 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 | 127,612 | 458,881
Investments with an unrealized loss of less than 12 months, unrealized losses | 1,599 | 5,102
Investments with an unrealized loss of 12 months or longer, fair value | 61,820 | 163,767
Investments with an unrealized loss of 12 months or longer, unrealized losses | 1,337 | 2,674
Total investments with an unrealized loss, fair value | 189,432 | 622,648
Total investments with an unrealized loss, unrealized losses | 2,936 | 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 | 137,622 | 204,958
Investments with an unrealized loss of less than 12 months, unrealized losses | 6,616 | 1,938
Investments with an unrealized loss of 12 months or longer, fair value | 487,471 | 244,884
Investments with an unrealized loss of 12 months or longer, unrealized losses | 35,555 | 5,311
Total investments with an unrealized loss, fair value | 625,093 | 449,842
Total investments with an unrealized loss, unrealized losses | 42,171 | 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 | 80,904 | 75,488
Investments with an unrealized loss of less than 12 months, unrealized losses | 7,905 | 796
Investments with an unrealized loss of 12 months or longer, fair value | 48,125 | 59,816
Investments with an unrealized loss of 12 months or longer, unrealized losses | 5,686 | 497
Total investments with an unrealized loss, fair value | 129,029 | 135,304
Total investments with an unrealized loss, unrealized losses | 13,591 | 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 | 19,269 | 0
Investments with an unrealized loss of less than 12 months, unrealized losses | 1,439 | 0
Investments with an unrealized loss of 12 months or longer, fair value | 8,300 | 16,908
Investments with an unrealized loss of 12 months or longer, unrealized losses | 1,700 | 743
Total investments with an unrealized loss, fair value | 27,569 | 16,908
Total investments with an unrealized loss, unrealized losses | $ 3,139 | $ 743

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 + Details
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