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Investments, Gross Unrealized Losses and Fair Value and Net Unrealized Gains (Losses) (Details) $ in Thousands | Mar. 31, 2022 USD ($) Security | Dec. 31, 2021 USD ($)
--- | --- | ---
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |
Number of securities owned with fair value less than cost | Security | 268 |
Less than twelve months, Fair value | $ 322,280 | $ 211,396
Twelve months or greater, Fair value | 34,671 | 18,416
Total, Fair value | 356,951 | 229,812
Less than twelve months, Gross unrealized losses | (17,862) | (3,261)
Twelve months or greater, Gross unrealized losses | (3,605) | (736)
Total, Gross Unrealized Losses | (21,467) | (3,997)
U.S. Agency Securities [Member] |  |
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |
Less than twelve months, Fair value | 36,781 | 26,754
Twelve months or greater, Fair value | 11,106 | 7,542
Total, Fair value | 47,887 | 34,296
Less than twelve months, Gross unrealized losses | (1,989) | (387)
Twelve months or greater, Gross unrealized losses | (1,376) | (447)
Total, Gross Unrealized Losses | (3,365) | (834)
U.S. Treasury Securities [Member] |  |
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |
Less than twelve months, Fair value | 130,927 | 106,794
Twelve months or greater, Fair value | 2,036 | 0
Total, Fair value | 132,963 | 106,794
Less than twelve months, Gross unrealized losses | (7,187) | (1,459)
Twelve months or greater, Gross unrealized losses | (128) | 0
Total, Gross Unrealized Losses | (7,315) | (1,459)
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 | 79,321 | 10,744
Twelve months or greater, Fair value | 2,674 | 2,899
Total, Fair value | 81,995 | 13,643
Less than twelve months, Gross unrealized losses | (3,786) | (26)
Twelve months or greater, Gross unrealized losses | (243) | (26)
Total, Gross Unrealized Losses | (4,029) | (52)
Corporate Obligations [Member] |  |
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |
Less than twelve months, Fair value | 8,311 | 6,922
Twelve months or greater, Fair value | 483 | 0
Total, Fair value | 8,794 | 6,922
Less than twelve months, Gross unrealized losses | (306) | (84)
Twelve months or greater, Gross unrealized losses | (17) | 0
Total, Gross Unrealized Losses | (323) | (84)
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 | 66,940 | 60,182
Twelve months or greater, Fair value | 18,372 | 7,975
Total, Fair value | 85,312 | 68,157
Less than twelve months, Gross unrealized losses | (4,594) | (1,305)
Twelve months or greater, Gross unrealized losses | (1,841) | (263)
Total, Gross Unrealized Losses | $ (6,435) | $ (1,568)

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