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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | $ 75,062 | $ 255,984
Less than 12 months, unrealized losses | 357 | (1,319)
12 months or more, fair value | 0 | 41,491
12 months or more, unrealized losses | 0 | (435)
Total, fair value | 75,062 | 297,475
Total, unrealized losses | 357 | (1,754)
Obligations of U.S. Government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | 4,997 |
Less than 12 months, unrealized losses | 3 |
12 months or more, fair value | 0 |
12 months or more, unrealized losses | 0 |
Total, fair value | 4,997 |
Total, unrealized losses | 3 |
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | 4,079 | 56,327
Less than 12 months, unrealized losses | 33 | 363
12 months or more, fair value | 0 | 0
12 months or more, unrealized losses | 0 | 0
Total, fair value | 4,079 | 56,327
Total, unrealized losses | 33 | 363
Agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | 65,986 | 131,693
Less than 12 months, unrealized losses | 321 | 756
12 months or more, fair value | 0 | 41,491
12 months or more, unrealized losses | 0 | 435
Total, fair value | 65,986 | 173,184
Total, unrealized losses | $ 321 | 1,191
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

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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 that have been in a loss position for less than twelve months for securities 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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