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Investments, Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Investment (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Debt Securities [Abstract] |  |
Amortized cost | $ 442,926 | $ 453,343
Gross unrealized gains | 253 | 285
Gross unrealized losses | (38,314) | (36,027)
Allowance for credit losses | 0 | 0
Fair value | 404,865 | 417,601
U.S. Agency Securities [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 63,572 | 66,569
Gross unrealized gains | 2 | 1
Gross unrealized losses | (6,173) | (5,799)
Allowance for credit losses | 0 | 0
Fair value | 57,401 | 60,771
U.S. Treasury Securities [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 143,534 | 152,485
Gross unrealized gains | 0 | 0
Gross unrealized losses | (9,421) | (9,197)
Allowance for credit losses | 0 | 0
Fair value | 134,113 | 143,288
Obligations of State and Political Subdivisions [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 106,054 | 107,945
Gross unrealized gains | 12 | 32
Gross unrealized losses | (6,699) | (6,190)
Allowance for credit losses | 0 | 0
Fair value | 99,367 | 101,787
Corporate Obligations [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 13,409 | 13,394
Gross unrealized gains | 234 | 245
Gross unrealized losses | (1,340) | (1,236)
Allowance for credit losses | 0 | 0
Fair value | 12,303 | 12,403
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 116,357 | 112,950
Gross unrealized gains | 5 | 7
Gross unrealized losses | (14,681) | (13,605)
Allowance for credit losses | 0 | 0
Fair value | $ 101,681 | $ 99,352

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