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Securities- Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 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 | $ 1,704,605 | $ 1,017,346
Investments with an unrealized loss of less than 12 months, unrealized losses | 36,950 | 9,021
Investments with an unrealized loss of 12 months or longer, fair value | 984,619 | 361,724
Investments with an unrealized loss of 12 months or longer, unrealized losses | 44,939 | 8,526
Total investments with an unrealized loss, fair value | 2,689,224 | 1,379,070
Total investments with an unrealized loss, unrealized losses | 81,889 | 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 | 30,284 | 29,948
Investments with an unrealized loss of less than 12 months, unrealized losses | 39 | 60
Investments with an unrealized loss of 12 months or longer, fair value | 244 | 0
Investments with an unrealized loss of 12 months or longer, unrealized losses | 6 | 0
Total investments with an unrealized loss, fair value | 30,528 | 29,948
Total investments with an unrealized loss, unrealized losses | 45 | 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 | 13,605 | 173,677
Investments with an unrealized loss of less than 12 months, unrealized losses | 360 | 1,766
Investments with an unrealized loss of 12 months or longer, fair value | 45,118 | 0
Investments with an unrealized loss of 12 months or longer, unrealized losses | 1,140 | 0
Total investments with an unrealized loss, fair value | 58,723 | 173,677
Total investments with an unrealized loss, unrealized losses | 1,500 | 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 | 289,149 | 607,408
Investments with an unrealized loss of less than 12 months, unrealized losses | 5,951 | 5,042
Investments with an unrealized loss of 12 months or longer, fair value | 807,418 | 285,561
Investments with an unrealized loss of 12 months or longer, unrealized losses | 37,412 | 7,082
Total investments with an unrealized loss, fair value | 1,096,567 | 892,969
Total investments with an unrealized loss, unrealized losses | 43,363 | 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 | 1,144,600 | 115,403
Investments with an unrealized loss of less than 12 months, unrealized losses | 29,599 | 1,408
Investments with an unrealized loss of 12 months or longer, fair value | 108,653 | 50,083
Investments with an unrealized loss of 12 months or longer, unrealized losses | 5,663 | 1,226
Total investments with an unrealized loss, fair value | 1,253,253 | 165,486
Total investments with an unrealized loss, unrealized losses | 35,262 | 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 | 204,638 | 68,742
Investments with an unrealized loss of less than 12 months, unrealized losses | 741 | 198
Investments with an unrealized loss of 12 months or longer, fair value | 4,505 | 14,136
Investments with an unrealized loss of 12 months or longer, unrealized losses | 18 | 118
Total investments with an unrealized loss, fair value | 209,143 | 82,878
Total investments with an unrealized loss, unrealized losses | 759 | 316
Corporate notes |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 22,329 | 22,168
Investments with an unrealized loss of less than 12 months, unrealized losses | 260 | 547
Investments with an unrealized loss of 12 months or longer, fair value | 18,681 | 11,944
Investments with an unrealized loss of 12 months or longer, unrealized losses | 700 | 100
Total investments with an unrealized loss, fair value | 41,010 | 34,112
Total investments with an unrealized loss, unrealized losses | $ 960 | $ 647

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