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Securities- Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 1,930,176 | $ 1,017,346
Investments with an unrealized loss of less than 12 months, unrealized losses | 37,542 | 9,021
Investments with an unrealized loss of 12 months or longer, fair value | 367,056 | 361,724
Investments with an unrealized loss of 12 months or longer, unrealized losses | 14,543 | 8,526
Total investments with an unrealized loss, fair value | 2,297,232 | 1,379,070
Total investments with an unrealized loss, unrealized losses | 52,085 | 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 | 30,697 | 29,948
Investments with an unrealized loss of less than 12 months, unrealized losses | 56 | 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 | 30,697 | 29,948
Total investments with an unrealized loss, unrealized losses | 56 | 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 | 145,967 | 173,677
Investments with an unrealized loss of less than 12 months, unrealized losses | 2,904 | 1,766
Investments with an unrealized loss of 12 months or longer, fair value | 248 | 0
Investments with an unrealized loss of 12 months or longer, unrealized losses | 1 | 0
Total investments with an unrealized loss, fair value | 146,215 | 173,677
Total investments with an unrealized loss, unrealized losses | 2,905 | 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 | 779,194 | 607,408
Investments with an unrealized loss of less than 12 months, unrealized losses | 17,392 | 5,042
Investments with an unrealized loss of 12 months or longer, fair value | 297,735 | 285,561
Investments with an unrealized loss of 12 months or longer, unrealized losses | 12,002 | 7,082
Total investments with an unrealized loss, fair value | 1,076,929 | 892,969
Total investments with an unrealized loss, unrealized losses | 29,394 | 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 | 863,010 | 115,403
Investments with an unrealized loss of less than 12 months, unrealized losses | 15,987 | 1,408
Investments with an unrealized loss of 12 months or longer, fair value | 47,894 | 50,083
Investments with an unrealized loss of 12 months or longer, unrealized losses | 2,335 | 1,226
Total investments with an unrealized loss, fair value | 910,904 | 165,486
Total investments with an unrealized loss, unrealized losses | 18,322 | 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 | 79,428 | 68,742
Investments with an unrealized loss of less than 12 months, unrealized losses | 449 | 198
Investments with an unrealized loss of 12 months or longer, fair value | 9,482 | 14,136
Investments with an unrealized loss of 12 months or longer, unrealized losses | 56 | 118
Total investments with an unrealized loss, fair value | 88,910 | 82,878
Total investments with an unrealized loss, unrealized losses | 505 | 316
Corporate notes |  |
Available-for-sale securities, continuous unrealized loss position [Abstract] |  |
Investments with an unrealized loss of less than 12 months, fair value | 31,880 | 22,168
Investments with an unrealized loss of less than 12 months, unrealized losses | 754 | 547
Investments with an unrealized loss of 12 months or longer, fair value | 11,697 | 11,944
Investments with an unrealized loss of 12 months or longer, unrealized losses | 149 | 100
Total investments with an unrealized loss, fair value | 43,577 | 34,112
Total investments with an unrealized loss, unrealized losses | $ 903 | $ 647

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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