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Fair Value (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Estimated Fair Value	$ 426,804,000	$ 406,549,000
Level 1 | U.S. Treasuries
Estimated Fair Value	0	0
Level 2 | U.S. Treasuries
Estimated Fair Value	10,058,000	7,889,000
U.S. Government Sponsored Enterprises
Estimated Fair Value	12,692,000	14,267,000
U.S. Government Sponsored Enterprises | Level 1
Estimated Fair Value	0	0
U.S. Treasuries | Level 3
Estimated Fair Value	0	0
U.S. Government Sponsored Enterprises | Level 2
Estimated Fair Value	12,692,000	14,267,000
U.S. Government Sponsored Enterprises | Level 3
Estimated Fair Value	0	0
Mortgage-Backed Securities
Estimated Fair Value	248,200,000	217,152,000
Mortgage-Backed Securities | Level 1
Estimated Fair Value	0	0
Mortgage-Backed Securities | Level 2
Estimated Fair Value	248,200,000	217,152,000
Mortgage-Backed Securities | Level 3
Estimated Fair Value	0	0
State and Political Subdivisions
Estimated Fair Value	155,854,000	167,241,000
State and Political Subdivisions | Level 1
Estimated Fair Value	0	0
State and Political Subdivisions | Level 2
Estimated Fair Value	155,854,000	167,241,000
State and Political Subdivisions | Level 3
Estimated Fair Value	0	0
Mutual funds held in deferred compensation trust
Mutual Funds Held In Deferred Compensation Trust	1,332,000	1,510,000
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	1,332,000	1,510,000
Mutual funds held in deferred compensation trust | Level 3
Mutual Funds Held In Deferred Compensation Trust	0	0
US Treasury Securities [Member]
Estimated Fair Value	$ 10,058,000	$ 7,889,000

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