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Investments, Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Investment (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Debt Securities [Abstract] |  |
Amortized cost | $ 393,165 | $ 287,521
Gross unrealized gains | 5,500 | 7,912
Gross unrealized losses | (1,622) | (244)
Fair value | 397,043 | 295,189
U.S. Agency Securities [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 67,288 | 79,065
Gross unrealized gains | 1,352 | 2,403
Gross unrealized losses | (384) | (52)
Fair value | 68,256 | 81,416
U.S. Treasury Securities [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 103,828 | 27,442
Gross unrealized gains | 238 | 601
Gross unrealized losses | (347) | 0
Fair value | 103,719 | 28,043
Obligations of State and Political Subdivisions [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 106,128 | 100,089
Gross unrealized gains | 2,778 | 2,938
Gross unrealized losses | (75) | (55)
Fair value | 108,831 | 102,972
Corporate Obligations [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 10,882 | 6,413
Gross unrealized gains | 70 | 96
Gross unrealized losses | (15) | 0
Fair value | 10,937 | 6,509
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 105,039 | 74,512
Gross unrealized gains | 1,062 | 1,874
Gross unrealized losses | (801) | (137)
Fair value | $ 105,300 | $ 76,249

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