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Investments, Gross Unrealized Losses and Fair Value and Net Unrealized Gains (Losses) (Details) $ in Thousands | Mar. 31, 2024 USD ($) Security | Dec. 31, 2023 USD ($)
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Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |
Number of securities owned with fair value less than cost | Security | 323 |
Less than twelve months, Fair value | $ 17,025 | $ 10,690
Less than twelve months, Gross unrealized losses | (452) | (296)
Twelve months or greater, Fair value | 374,546 | 392,449
Twelve months or greater, Gross unrealized losses | (37,862) | (35,731)
Total, Fair value | 391,571 | 403,139
Total, Gross Unrealized Losses | (38,314) | (36,027)
U.S. Agency Securities [Member] |  |
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |
Less than twelve months, Fair value | 0 | 0
Less than twelve months, Gross unrealized losses | 0 | 0
Twelve months or greater, Fair value | 55,384 | 58,753
Twelve months or greater, Gross unrealized losses | (6,173) | (5,799)
Total, Fair value | 55,384 | 58,753
Total, Gross Unrealized Losses | (6,173) | (5,799)
U.S. Treasury Securities [Member] |  |
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |
Less than twelve months, Fair value | 0 | 0
Less than twelve months, Gross unrealized losses | 0 | 0
Twelve months or greater, Fair value | 134,113 | 143,288
Twelve months or greater, Gross unrealized losses | (9,421) | (9,197)
Total, Fair value | 134,113 | 143,288
Total, Gross Unrealized Losses | (9,421) | (9,197)
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 | 881 | 0
Less than twelve months, Gross unrealized losses | (1) | 0
Twelve months or greater, Fair value | 91,299 | 93,535
Twelve months or greater, Gross unrealized losses | (6,698) | (6,190)
Total, Fair value | 92,180 | 93,535
Total, Gross Unrealized Losses | (6,699) | (6,190)
Corporate Obligations [Member] |  |
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |
Less than twelve months, Fair value | 1,494 | 1,487
Less than twelve months, Gross unrealized losses | (263) | (265)
Twelve months or greater, Fair value | 8,203 | 8,320
Twelve months or greater, Gross unrealized losses | (1,077) | (971)
Total, Fair value | 9,697 | 9,807
Total, Gross Unrealized Losses | (1,340) | (1,236)
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 | 14,650 | 9,203
Less than twelve months, Gross unrealized losses | (188) | (31)
Twelve months or greater, Fair value | 85,547 | 88,553
Twelve months or greater, Gross unrealized losses | (14,493) | (13,574)
Total, Fair value | 100,197 | 97,756
Total, Gross Unrealized Losses | $ (14,681) | $ (13,605)

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