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Securities- Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 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 | $ 475,732 | $ 781,054
Investments with an unrealized loss of less than 12 months, unrealized losses | 5,889 | 7,851
Investments with an unrealized loss of 12 months or longer, fair value | 675,694 | 516,267
Investments with an unrealized loss of 12 months or longer, unrealized losses | 29,399 | 9,934
Total investments with an unrealized loss, fair value | 1,151,426 | 1,297,321
Total investments with an unrealized loss, unrealized losses | 35,288 | 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 | 25,973 | 40,505
Investments with an unrealized loss of less than 12 months, unrealized losses | 2 | 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 | 25,973 | 40,505
Total investments with an unrealized loss, unrealized losses | 2 | 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 | 10,576 | 1,222
Investments with an unrealized loss of less than 12 months, unrealized losses | 4 | 1
Investments with an unrealized loss of 12 months or longer, fair value | 6,360 | 30,892
Investments with an unrealized loss of 12 months or longer, unrealized losses | 25 | 709
Total investments with an unrealized loss, fair value | 16,936 | 32,114
Total investments with an unrealized loss, unrealized losses | 29 | 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 | 138,532 | 458,881
Investments with an unrealized loss of less than 12 months, unrealized losses | 1,746 | 5,102
Investments with an unrealized loss of 12 months or longer, fair value | 39,350 | 163,767
Investments with an unrealized loss of 12 months or longer, unrealized losses | 682 | 2,674
Total investments with an unrealized loss, fair value | 177,882 | 622,648
Total investments with an unrealized loss, unrealized losses | 2,428 | 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 | 199,365 | 204,958
Investments with an unrealized loss of less than 12 months, unrealized losses | 3,608 | 1,938
Investments with an unrealized loss of 12 months or longer, fair value | 539,131 | 244,884
Investments with an unrealized loss of 12 months or longer, unrealized losses | 24,676 | 5,311
Total investments with an unrealized loss, fair value | 738,496 | 449,842
Total investments with an unrealized loss, unrealized losses | 28,284 | 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 | 74,977 | 75,488
Investments with an unrealized loss of less than 12 months, unrealized losses | 355 | 796
Investments with an unrealized loss of 12 months or longer, fair value | 67,973 | 59,816
Investments with an unrealized loss of 12 months or longer, unrealized losses | 816 | 497
Total investments with an unrealized loss, fair value | 142,950 | 135,304
Total investments with an unrealized loss, unrealized losses | 1,171 | 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 | 26,309 | 0
Investments with an unrealized loss of less than 12 months, unrealized losses | 174 | 0
Investments with an unrealized loss of 12 months or longer, fair value | 22,880 | 16,908
Investments with an unrealized loss of 12 months or longer, unrealized losses | 3,200 | 743
Total investments with an unrealized loss, fair value | 49,189 | 16,908
Total investments with an unrealized loss, unrealized losses | $ 3,374 | $ 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=121645371&loc=d3e27337-111563 + Details
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