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Fair Value (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Estimated fair value	$ 367,529,000	$ 245,249,000
Mutual funds held in deferred compensation trust
Mutual funds held in deferred compensation trust	1,421,000	1,320,000
Mortgage-Backed Securities
Estimated fair value	209,118,000	145,314,000
U.S. Government Sponsored Enterprises [Member]
Estimated fair value	15,194,000	7,507,000
State and Political Subdivisions
Estimated fair value	135,257,000	92,428,000
U.S. Treasuries [Member]
Estimated fair value	7,960,000
Level 1 | Mortgage-Backed Securities
Estimated fair value	0	0
Level 1 | U.S. Government Sponsored Enterprises [Member]
Estimated fair value	0	0
Level 1 | State and Political Subdivisions
Estimated fair value	0	0
Level 1 | U.S. Treasuries [Member]
Estimated fair value	0
Level 2 | State and Political Subdivisions
Estimated fair value	135,257,000	92,428,000
Level 2 | Mortgage-Backed Securities
Estimated fair value	209,118,000	145,314,000
Level 2 | U.S. Government Sponsored Enterprises
Estimated fair value	15,194,000	7,507,000
Level 2 | U.S. Treasuries [Member]
Estimated fair value	7,960,000
Level 3 | Mortgage-Backed Securities
Estimated fair value	0	0
Level 3 | U.S. Treasuries
Estimated fair value	0
Level 3 | State and Political Subdivisions
Estimated fair value	0	0
Level 3 | U.S. Government Sponsored Enterprises
Estimated fair value	0	0
Level 1
Estimated fair value	0	0
Level 1 | Mutual funds held in deferred compensation trust
Mutual funds held in deferred compensation trust	0	0
Level 2
Estimated fair value	367,529,000	245,249,000
Level 2 | Mutual funds held in deferred compensation trust
Mutual funds held in deferred compensation trust	1,421,000	1,320,000
Level 3
Estimated fair value	0	0
Level 3 | Mutual funds held in deferred compensation trust
Mutual funds held in deferred compensation trust	$ 0	$ 0

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