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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | $ 17,508 | $ 110,081
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 301 | 2,548
12 months or more, fair value | 178,856 | 492,727
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,619 | 12,610
Total, fair value | 196,364 | 602,808
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 1,920 | 15,158
Obligations of U.S. Government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value |  | 19,622
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 322
12 months or more, fair value |  | 78,876
Securities Available for Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses |  | 1,106
Total, fair value |  | 98,498
Securities Available for Sale Continuous Unrealized Loss Position, Total Aggregate Losses |  | 1,428
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | 386 | 3,102
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 15
12 months or more, fair value | 839 | 14,156
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 182
Total, fair value | 1,225 | 17,258
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 1 | 197
Agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | 17,122 | 87,357
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 300 | 2,211
12 months or more, fair value | 178,017 | 389,770
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,619 | 11,285
Total, fair value | 195,139 | 477,127
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 1,919 | 13,496
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-sale [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 in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 + Details
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