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Investments, Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Investment (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Debt Securities [Abstract] |  |
Amortized cost | $ 364,036 | $ 287,521
Gross unrealized gains | 6,266 | 7,912
Gross unrealized losses | (1,300) | (244)
Fair value | 369,002 | 295,189
U.S. Agency Securities [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 83,329 | 79,065
Gross unrealized gains | 1,727 | 2,403
Gross unrealized losses | (545) | (52)
Fair value | 84,511 | 81,416
U.S. Treasury Securities [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 69,408 | 27,442
Gross unrealized gains | 404 | 601
Gross unrealized losses | (127) | 0
Fair value | 69,685 | 28,043
Obligations of State and Political Subdivisions [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 106,369 | 100,089
Gross unrealized gains | 2,858 | 2,938
Gross unrealized losses | (72) | (55)
Fair value | 109,155 | 102,972
Corporate Obligations [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 10,892 | 6,413
Gross unrealized gains | 67 | 96
Gross unrealized losses | (4) | 0
Fair value | 10,955 | 6,509
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 94,038 | 74,512
Gross unrealized gains | 1,210 | 1,874
Gross unrealized losses | (552) | (137)
Fair value | $ 94,696 | $ 76,249

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