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Securities- Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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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 | $ 428,261 | $ 1,586,756
Investments with an unrealized loss of less than 12 months, unrealized losses | 3,217 | 38,920
Investments with an unrealized loss of 12 months or longer, fair value | 696,427 | 1,161,369
Investments with an unrealized loss of 12 months or longer, unrealized losses | 17,016 | 32,811
Total investments with an unrealized loss, fair value | 1,124,688 | 2,748,125
Total investments with an unrealized loss, unrealized losses | 20,233 | 71,731
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 | 9,622 | 30,054
Investments with an unrealized loss of less than 12 months, unrealized losses | 4 | 22
Investments with an unrealized loss of 12 months or longer, fair value | 0 | 246
Investments with an unrealized loss of 12 months or longer, unrealized losses | 0 | 3
Total investments with an unrealized loss, fair value | 9,622 | 30,300
Total investments with an unrealized loss, unrealized losses | 4 | 25
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 | 2,942 | 13,697
Investments with an unrealized loss of less than 12 months, unrealized losses | 5 | 328
Investments with an unrealized loss of 12 months or longer, fair value | 33,247 | 42,539
Investments with an unrealized loss of 12 months or longer, unrealized losses | 829 | 1,018
Total investments with an unrealized loss, fair value | 36,189 | 56,236
Total investments with an unrealized loss, unrealized losses | 834 | 1,346
Mortgage-backed securities |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 116,784 | 203,299
Investments with an unrealized loss of less than 12 months, unrealized losses | 515 | 2,134
Investments with an unrealized loss of 12 months or longer, fair value | 210,395 | 882,231
Investments with an unrealized loss of 12 months or longer, unrealized losses | 3,150 | 26,500
Total investments with an unrealized loss, fair value | 327,179 | 1,085,530
Total investments with an unrealized loss, unrealized losses | 3,665 | 28,634
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 | 214,033 | 1,044,757
Investments with an unrealized loss of less than 12 months, unrealized losses | 1,874 | 30,780
Investments with an unrealized loss of 12 months or longer, fair value | 383,023 | 198,610
Investments with an unrealized loss of 12 months or longer, unrealized losses | 11,813 | 4,078
Total investments with an unrealized loss, fair value | 597,056 | 1,243,367
Total investments with an unrealized loss, unrealized losses | 13,687 | 34,858
Asset-backed securities |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 69,921 | 268,677
Investments with an unrealized loss of less than 12 months, unrealized losses | 699 | 4,118
Investments with an unrealized loss of 12 months or longer, fair value | 57,709 | 11,828
Investments with an unrealized loss of 12 months or longer, unrealized losses | 503 | 227
Total investments with an unrealized loss, fair value | 127,630 | 280,505
Total investments with an unrealized loss, unrealized losses | 1,202 | 4,345
Corporate notes |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 14,959 | 26,272
Investments with an unrealized loss of less than 12 months, unrealized losses | 120 | 1,538
Investments with an unrealized loss of 12 months or longer, fair value | 12,053 | 25,915
Investments with an unrealized loss of 12 months or longer, unrealized losses | 721 | 985
Total investments with an unrealized loss, fair value | 27,012 | 52,187
Total investments with an unrealized loss, unrealized losses | $ 841 | $ 2,523

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