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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | $ 255,984 | $ 110,081
Less than 12 months, unrealized losses | 1,319 | (2,548)
12 months or more, fair value | 41,491 | 492,727
12 months or more, unrealized losses | 435 | (12,610)
Total, fair value | 297,475 | 602,808
Total, unrealized losses | 1,754 | (15,158)
Obligations of U.S. Government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value |  | 19,622
Less than 12 months, unrealized losses |  | 322
12 months or more, fair value |  | 78,876
12 months or more, unrealized losses |  | 1,106
Total, fair value |  | 98,498
Total, unrealized losses |  | 1,428
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | 56,327 | 3,102
Less than 12 months, unrealized losses | 363 | 15
12 months or more, fair value | 0 | 14,156
12 months or more, unrealized losses | 0 | 182
Total, fair value | 56,327 | 17,258
Total, unrealized losses | 363 | 197
Agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | 131,693 | 87,357
Less than 12 months, unrealized losses | 756 | 2,211
12 months or more, fair value | 41,491 | 389,770
12 months or more, unrealized losses | 435 | 11,285
Total, fair value | 173,184 | 477,127
Total, unrealized losses | 1,191 | 13,496
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | 67,964 |
Less than 12 months, unrealized losses | 200 |
12 months or more, fair value | 0 |
12 months or more, unrealized losses | 0 |
Total, fair value | 67,964 |
Total, unrealized losses | $ 200 |
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value |  | 0
Less than 12 months, unrealized losses |  | 0
12 months or more, fair value |  | 9,925
12 months or more, unrealized losses |  | 37
Total, fair value |  | 9,925
Total, unrealized losses |  | $ 37

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