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Securities- Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 443,073 | $ 1,347,820
Investments with an unrealized loss of less than 12 months, unrealized losses | 5,501 | 26,783
Investments with an unrealized loss of 12 months or longer, fair value | 1,166,184 | 1,161,369
Investments with an unrealized loss of 12 months or longer, unrealized losses | 18,593 | 32,811
Total investments with an unrealized loss, fair value | 1,609,257 | 2,509,189
Total investments with an unrealized loss, unrealized losses | 24,094 | 59,594
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 | 29,824 | 30,054
Investments with an unrealized loss of less than 12 months, unrealized losses | 3 | 22
Investments with an unrealized loss of 12 months or longer, fair value | 248 | 246
Investments with an unrealized loss of 12 months or longer, unrealized losses | 2 | 3
Total investments with an unrealized loss, fair value | 30,072 | 30,300
Total investments with an unrealized loss, unrealized losses | 5 | 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 | 6,631 | 13,697
Investments with an unrealized loss of less than 12 months, unrealized losses | 58 | 328
Investments with an unrealized loss of 12 months or longer, fair value | 51,280 | 42,539
Investments with an unrealized loss of 12 months or longer, unrealized losses | 1,217 | 1,018
Total investments with an unrealized loss, fair value | 57,911 | 56,236
Total investments with an unrealized loss, unrealized losses | 1,275 | 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 | 82,112 | 203,299
Investments with an unrealized loss of less than 12 months, unrealized losses | 565 | 2,134
Investments with an unrealized loss of 12 months or longer, fair value | 987,424 | 882,231
Investments with an unrealized loss of 12 months or longer, unrealized losses | 15,760 | 26,500
Total investments with an unrealized loss, fair value | 1,069,536 | 1,085,530
Total investments with an unrealized loss, unrealized losses | 16,325 | 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 | 161,772 | 805,821
Investments with an unrealized loss of less than 12 months, unrealized losses | 2,622 | 18,643
Investments with an unrealized loss of 12 months or longer, fair value | 80,686 | 198,610
Investments with an unrealized loss of 12 months or longer, unrealized losses | 509 | 4,078
Total investments with an unrealized loss, fair value | 242,458 | 1,004,431
Total investments with an unrealized loss, unrealized losses | 3,131 | 22,721
Asset-backed securities |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 152,062 | 268,677
Investments with an unrealized loss of less than 12 months, unrealized losses | 1,534 | 4,118
Investments with an unrealized loss of 12 months or longer, fair value | 26,675 | 11,828
Investments with an unrealized loss of 12 months or longer, unrealized losses | 423 | 227
Total investments with an unrealized loss, fair value | 178,737 | 280,505
Total investments with an unrealized loss, unrealized losses | 1,957 | 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 | 10,672 | 26,272
Investments with an unrealized loss of less than 12 months, unrealized losses | 719 | 1,538
Investments with an unrealized loss of 12 months or longer, fair value | 19,871 | 25,915
Investments with an unrealized loss of 12 months or longer, unrealized losses | 682 | 985
Total investments with an unrealized loss, fair value | 30,543 | 52,187
Total investments with an unrealized loss, unrealized losses | $ 1,401 | $ 2,523

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