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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | $ 305,210 | $ 289,095
Less than 12 months, unrealized losses | 2,210 | 4,492
12 months or more, fair value | 12,918 | 16,436
12 months or more, unrealized losses | 451 | 813
Total, fair value | 318,128 | 305,531
Total, unrealized losses | 2,661 | 5,305
Obligations of U.S. Government-sponsored enterprises |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | 10,142 |
Less than 12 months, unrealized losses | 6 |
12 months or more, fair value | 0 |
12 months or more, unrealized losses | 0 |
Total, fair value | 10,142 |
Total, unrealized losses | 6 |
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | 1,642 | 21,361
Less than 12 months, unrealized losses | 7 | 408
12 months or more, fair value | 0 | 3,553
12 months or more, unrealized losses | 0 | 320
Total, fair value | 1,642 | 24,914
Total, unrealized losses | 7 | 728
Agency mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | 293,426 | 267,734
Less than 12 months, unrealized losses | 2,197 | 4,084
12 months or more, fair value | 12,918 | 12,883
12 months or more, unrealized losses | 451 | 493
Total, fair value | 306,344 | 280,617
Total, unrealized losses | $ 2,648 | $ 4,577

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- Definition Amount of the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for securities which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Amount of the excess of amortized cost basis over fair value of securities in a loss position and categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + 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)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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