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Investments, Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Investment (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Debt Securities [Abstract] |  |
Amortized cost | $ 318,444 | $ 287,521
Gross unrealized gains | 5,497 | 7,912
Gross unrealized losses | (1,974) | (244)
Fair value | 321,967 | 295,189
U.S. Agency Securities [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 78,375 | 79,065
Gross unrealized gains | 2,020 | 2,403
Gross unrealized losses | (686) | (52)
Fair value | 79,709 | 81,416
U.S. Treasury Securities [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 39,995 | 27,442
Gross unrealized gains | 458 | 601
Gross unrealized losses | (91) | 0
Fair value | 40,362 | 28,043
Obligations of State and Political Subdivisions [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 101,007 | 100,089
Gross unrealized gains | 1,771 | 2,938
Gross unrealized losses | (433) | (55)
Fair value | 102,345 | 102,972
Corporate Obligations [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 6,902 | 6,413
Gross unrealized gains | 86 | 96
Gross unrealized losses | (5) | 0
Fair value | 6,983 | 6,509
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 92,165 | 74,512
Gross unrealized gains | 1,162 | 1,874
Gross unrealized losses | (759) | (137)
Fair value | $ 92,568 | $ 76,249

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