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Fair Value (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Estimated fair value | $ 402,905,000 | $ 245,249,000
Mutual funds held in deferred compensation trust |  |
Mutual funds held in deferred compensation trust | 1,514,000 | 1,320,000
Mortgage-Backed Securities |  |
Estimated fair value | 223,305,000 | 145,314,000
U.S. Government Sponsored Enterprises [Member] |  |
Estimated fair value | 14,677,000 | 7,507,000
State and Political Subdivisions |  |
Estimated fair value | 156,933,000 | 92,428,000
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 2 | State and Political Subdivisions |  |
Estimated fair value | 156,933,000 | 92,428,000
Level 2 | Mortgage-Backed Securities |  |
Estimated fair value | 223,305,000 | 145,314,000
Level 2 | U.S. Government Sponsored Enterprises |  |
Estimated fair value | 14,677,000 | 7,507,000
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 | 402,905,000 | 245,249,000
Level 2 | Mutual funds held in deferred compensation trust |  |
Mutual funds held in deferred compensation trust | 1,514,000 | 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
U.S. Treasuries [Member] | Level 1 |  |
Estimated fair value | 0 |
U.S. Treasuries [Member] | Level 2 |  |
Estimated fair value | 7,990,000 |
U.S. Treasuries [Member] |  |
Estimated fair value | $ 7,990,000 |

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