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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | $ 68,040 | $ 110,081
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 790 | 2,548
12 months or more, fair value | 359,064 | 492,727
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4,699 | 12,610
Total, fair value | 427,104 | 602,808
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 5,489 | 15,158
Obligations of U.S. Government-sponsored enterprises |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | 19,854 | 19,622
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 95 | 322
12 months or more, fair value | 29,796 | 78,876
Securities Available for Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses |  | 1,106
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 252 |
Total, fair value | 49,650 | 98,498
Securities Available for Sale Continuous Unrealized Loss Position, Total Aggregate Losses |  | 1,428
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 347 |
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | 680 | 3,102
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 10 | 15
12 months or more, fair value | 2,949 | 14,156
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 13 | 182
Total, fair value | 3,629 | 17,258
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 23 | 197
Agency mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | 47,506 | 87,357
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 685 | 2,211
12 months or more, fair value | 326,319 | 389,770
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4,434 | 11,285
Total, fair value | 373,825 | 477,127
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 5,119 | 13,496
US Treasury Bill Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 0
12 months or more, fair value |  | 9,925
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 37
Total, fair value |  | 9,925
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ 37

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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 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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