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Securities- Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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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 | $ 1,882,672 | $ 1,017,346
Investments with an unrealized loss of less than 12 months, unrealized losses | 38,834 | 9,021
Investments with an unrealized loss of 12 months or longer, fair value | 438,993 | 361,724
Investments with an unrealized loss of 12 months or longer, unrealized losses | 18,121 | 8,526
Total investments with an unrealized loss, fair value | 2,321,665 | 1,379,070
Total investments with an unrealized loss, unrealized losses | 56,955 | 17,547
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 | 30,780 | 29,948
Investments with an unrealized loss of less than 12 months, unrealized losses | 26 | 60
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 | 30,780 | 29,948
Total investments with an unrealized loss, unrealized losses | 26 | 60
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 | 134,322 | 173,677
Investments with an unrealized loss of less than 12 months, unrealized losses | 3,308 | 1,766
Investments with an unrealized loss of 12 months or longer, fair value | 27,480 | 0
Investments with an unrealized loss of 12 months or longer, unrealized losses | 678 | 0
Total investments with an unrealized loss, fair value | 161,802 | 173,677
Total investments with an unrealized loss, unrealized losses | 3,986 | 1,766
Mortgage-backed securities |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 720,677 | 607,408
Investments with an unrealized loss of less than 12 months, unrealized losses | 19,811 | 5,042
Investments with an unrealized loss of 12 months or longer, fair value | 339,377 | 285,561
Investments with an unrealized loss of 12 months or longer, unrealized losses | 14,331 | 7,082
Total investments with an unrealized loss, fair value | 1,060,054 | 892,969
Total investments with an unrealized loss, unrealized losses | 34,142 | 12,124
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 | 860,821 | 115,403
Investments with an unrealized loss of less than 12 months, unrealized losses | 14,143 | 1,408
Investments with an unrealized loss of 12 months or longer, fair value | 62,029 | 50,083
Investments with an unrealized loss of 12 months or longer, unrealized losses | 2,979 | 1,226
Total investments with an unrealized loss, fair value | 922,850 | 165,486
Total investments with an unrealized loss, unrealized losses | 17,122 | 2,634
Asset-backed securities |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 102,604 | 68,742
Investments with an unrealized loss of less than 12 months, unrealized losses | 583 | 198
Investments with an unrealized loss of 12 months or longer, fair value | 5,636 | 14,136
Investments with an unrealized loss of 12 months or longer, unrealized losses | 6 | 118
Total investments with an unrealized loss, fair value | 108,240 | 82,878
Total investments with an unrealized loss, unrealized losses | 589 | 316
Corporate notes |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 33,468 | 22,168
Investments with an unrealized loss of less than 12 months, unrealized losses | 963 | 547
Investments with an unrealized loss of 12 months or longer, fair value | 4,471 | 11,944
Investments with an unrealized loss of 12 months or longer, unrealized losses | 127 | 100
Total investments with an unrealized loss, fair value | 37,939 | 34,112
Total investments with an unrealized loss, unrealized losses | $ 1,090 | $ 647

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