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Securities- Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 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 | $ 285,139 | $ 1,347,820
Investments with an unrealized loss of less than 12 months, unrealized losses | 2,316 | 26,783
Investments with an unrealized loss of 12 months or longer, fair value | 551,403 | 1,161,369
Investments with an unrealized loss of 12 months or longer, unrealized losses | 8,141 | 32,811
Total investments with an unrealized loss, fair value | 836,542 | 2,509,189
Total investments with an unrealized loss, unrealized losses | 10,457 | 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 | 0 | 30,054
Investments with an unrealized loss of less than 12 months, unrealized losses | 0 | 22
Investments with an unrealized loss of 12 months or longer, fair value | 250 | 246
Investments with an unrealized loss of 12 months or longer, unrealized losses | 0 | 3
Total investments with an unrealized loss, fair value | 250 | 30,300
Total investments with an unrealized loss, unrealized losses | 0 | 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 | 2,064 | 13,697
Investments with an unrealized loss of less than 12 months, unrealized losses | 9 | 328
Investments with an unrealized loss of 12 months or longer, fair value | 35,391 | 42,539
Investments with an unrealized loss of 12 months or longer, unrealized losses | 986 | 1,018
Total investments with an unrealized loss, fair value | 37,455 | 56,236
Total investments with an unrealized loss, unrealized losses | 995 | 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 | 84,937 | 203,299
Investments with an unrealized loss of less than 12 months, unrealized losses | 535 | 2,134
Investments with an unrealized loss of 12 months or longer, fair value | 471,224 | 882,231
Investments with an unrealized loss of 12 months or longer, unrealized losses | 5,896 | 26,500
Total investments with an unrealized loss, fair value | 556,161 | 1,085,530
Total investments with an unrealized loss, unrealized losses | 6,431 | 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 | 76,291 | 805,821
Investments with an unrealized loss of less than 12 months, unrealized losses | 489 | 18,643
Investments with an unrealized loss of 12 months or longer, fair value | 11,663 | 198,610
Investments with an unrealized loss of 12 months or longer, unrealized losses | 53 | 4,078
Total investments with an unrealized loss, fair value | 87,954 | 1,004,431
Total investments with an unrealized loss, unrealized losses | 542 | 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 | 104,510 | 268,677
Investments with an unrealized loss of less than 12 months, unrealized losses | 775 | 4,118
Investments with an unrealized loss of 12 months or longer, fair value | 22,373 | 11,828
Investments with an unrealized loss of 12 months or longer, unrealized losses | 201 | 227
Total investments with an unrealized loss, fair value | 126,883 | 280,505
Total investments with an unrealized loss, unrealized losses | 976 | 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 | 17,337 | 26,272
Investments with an unrealized loss of less than 12 months, unrealized losses | 508 | 1,538
Investments with an unrealized loss of 12 months or longer, fair value | 10,502 | 25,915
Investments with an unrealized loss of 12 months or longer, unrealized losses | 1,005 | 985
Total investments with an unrealized loss, fair value | 27,839 | 52,187
Total investments with an unrealized loss, unrealized losses | $ 1,513 | $ 2,523

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