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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | $ 525,032 | $ 572,915
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 12,938 | 6,953
12 months or more, fair value | 134,492 | 12,229
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 6,087 | 589
Total, fair value | 659,524 | 585,144
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 19,025 | 7,542
Obligations of U.S. Government-sponsored enterprises |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | 98,044 | 89,309
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,858 |
Securities Available for Sale, Continuous Unrealized Loss Position, Less Than 12 Months, Aggregate Losses |  | 660
12 months or more, fair value | 0 | 0
Securities Available for Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Total, fair value | 98,044 | 89,309
Securities Available for Sale Continuous Unrealized Loss Position, Total Aggregate Losses |  | 660
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 1,858 |
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | 24,883 | 13,951
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 369 | 259
12 months or more, fair value | 364 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 25 | 0
Total, fair value | 25,247 | 13,951
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 394 | 259
Agency mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | 392,242 | 469,655
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 10,617 | 6,034
12 months or more, fair value | 134,128 | 12,229
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 6,062 | 589
Total, fair value | 526,370 | 481,884
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 16,679 | $ 6,623
US Treasury Bill Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | 9,863 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 94 |
12 months or more, fair value | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Total, fair value | 9,863 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 94 |

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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 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=82897076&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=82897076&loc=d3e27337-111563 + Details
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