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Investments, Gross Unrealized Losses and Fair Value and Net Unrealized Gains (Losses) (Details) $ in Thousands | Sep. 30, 2021 USD ($) Security | Dec. 31, 2020 USD ($)
--- | --- | ---
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |
Less than twelve months, Fair value | $ 136,462 | $ 33,727
Twelve months or greater, Fair value | 11,879 | 5,633
Total, Fair value | 148,341 | 39,360
Less than twelve months, Gross unrealized losses | (1,372) | (206)
Twelve months or greater, Gross unrealized losses | (250) | (38)
Total, Gross Unrealized Losses | $ (1,622) | (244)
Number of securities owned with fair value less than cost | Security | 96 |
U.S. Agency Securities [Member] |  |
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |
Less than twelve months, Fair value | $ 9,391 | 13,720
Twelve months or greater, Fair value | 4,776 | 0
Total, Fair value | 14,167 | 13,720
Less than twelve months, Gross unrealized losses | (172) | (52)
Twelve months or greater, Gross unrealized losses | (212) | 0
Total, Gross Unrealized Losses | (384) | (52)
U.S. Treasury Securities [Member] |  |
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |
Less than twelve months, Fair value | 67,806 |
Twelve months or greater, Fair value | 0 |
Total, Fair value | 67,806 |
Less than twelve months, Gross unrealized losses | (347) |
Twelve months or greater, Gross unrealized losses | 0 |
Total, Gross Unrealized Losses | (347) |
Obligations of State and Political Subdivisions [Member] |  |
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |
Less than twelve months, Fair value | 13,289 | 5,407
Twelve months or greater, Fair value | 1,887 | 0
Total, Fair value | 15,176 | 5,407
Less than twelve months, Gross unrealized losses | (49) | (55)
Twelve months or greater, Gross unrealized losses | (26) | 0
Total, Gross Unrealized Losses | (75) | (55)
Corporate Obligations [Member] |  |
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |
Less than twelve months, Fair value | 4,485 |
Twelve months or greater, Fair value | 0 |
Total, Fair value | 4,485 |
Less than twelve months, Gross unrealized losses | (15) |
Twelve months or greater, Gross unrealized losses | 0 |
Total, Gross Unrealized Losses | (15) |
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |
Less than twelve months, Fair value | 41,491 | 14,600
Twelve months or greater, Fair value | 5,216 | 5,633
Total, Fair value | 46,707 | 20,233
Less than twelve months, Gross unrealized losses | (789) | (99)
Twelve months or greater, Gross unrealized losses | (12) | (38)
Total, Gross Unrealized Losses | $ (801) | $ (137)

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