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Fair Value (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Estimated Fair Value	$ 394,084,000	$ 445,394,000
U.S. Government sponsored enterprises
Estimated Fair Value	10,745,000	11,539,000
U.S. Government sponsored enterprises | Level 1
Estimated Fair Value	0	0
U.S. Government sponsored enterprises | Level 2
Estimated Fair Value	10,745,000	11,539,000
U.S. Government sponsored enterprises | Level 3
Estimated Fair Value	0	0
Mortgage-backed securities
Estimated Fair Value	259,867,000	273,838,000
Mortgage-backed securities | Level 1
Estimated Fair Value	0	0
Mortgage-backed securities | Level 2
Estimated Fair Value	259,867,000	273,838,000
Mortgage-backed securities | Level 3
Estimated Fair Value	0	0
State and political subdivisions
Estimated Fair Value	98,344,000	150,203,000
State and political subdivisions | Level 1
Estimated Fair Value	0	0
State and political subdivisions | Level 2
Estimated Fair Value	98,344,000	150,203,000
State and political subdivisions | Level 3
Estimated Fair Value	0	0
US Treasury Securities [Member]
Estimated Fair Value	9,838,000	9,814,000
US Treasury Securities [Member] | Level 1
Estimated Fair Value	0	0
US Treasury Securities [Member] | Level 2
Estimated Fair Value	9,838,000	9,814,000
US Treasury Securities [Member] | Level 3
Estimated Fair Value	0	0
Mutual funds held in deferred compensation trust
Mutual Funds Held In Deferred Compensation Trust	1,850,000	1,327,000
Mutual funds held in deferred compensation trust | Level 1
Mutual Funds Held In Deferred Compensation Trust	0	0
Mutual funds held in deferred compensation trust | Level 2
Mutual Funds Held In Deferred Compensation Trust	1,850,000	1,327,000
Mutual funds held in deferred compensation trust | Level 3
Mutual Funds Held In Deferred Compensation Trust	$ 0	$ 0

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