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Investments, Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Investment (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Debt Securities [Abstract] |  |
Amortized cost | $ 481,924 | $ 486,993
Gross unrealized gains | 78 | 50
Gross unrealized losses | (38,587) | (47,537)
Allowance for credit losses | 0 | 0
Fair value | 443,415 | 439,506
U.S. Agency Securities [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 77,060 | 78,556
Gross unrealized gains | 0 | 0
Gross unrealized losses | (6,211) | (7,879)
Allowance for credit losses | 0 | 0
Fair value | 70,849 | 70,677
U.S. Treasury Securities [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 162,300 | 162,236
Gross unrealized gains | 0 | 0
Gross unrealized losses | (10,590) | (13,666)
Allowance for credit losses | 0 | 0
Fair value | 151,710 | 148,570
Obligations of State and Political Subdivisions [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 120,128 | 120,562
Gross unrealized gains | 66 | 35
Gross unrealized losses | (8,656) | (10,297)
Allowance for credit losses | 0 | 0
Fair value | 111,538 | 110,300
Corporate Obligations [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 10,324 | 10,335
Gross unrealized gains | 0 | 0
Gross unrealized losses | (972) | (952)
Allowance for credit losses | 0 | 0
Fair value | 9,352 | 9,383
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 112,112 | 115,304
Gross unrealized gains | 12 | 15
Gross unrealized losses | (12,158) | (14,743)
Allowance for credit losses | 0 | 0
Fair value | $ 99,966 | $ 100,576

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