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6. Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Estimated fair value | $ 325,517 | $ 245,249
Level 1 |  |
Estimated fair value | 0 | 0
Level 2 |  |
Estimated fair value | 325,517 | 245,249
Level 3 |  |
Estimated fair value | 0 | 0
U.S. Treasuries |  |
Estimated fair value | 7,960 | 0
U.S. Treasuries | Level 1 |  |
Estimated fair value | 0 |
U.S. Treasuries | Level 2 |  |
Estimated fair value | 7,960 |
U.S. Treasuries | Level 3 |  |
Estimated fair value | 0 |
U.S. Government Sponsored Enterprises |  |
Estimated fair value | 13,019 | 7,507
U.S. Government Sponsored Enterprises | Level 1 |  |
Estimated fair value | 0 | 0
U.S. Government Sponsored Enterprises | Level 2 |  |
Estimated fair value | 13,019 | 7,507
U.S. Government Sponsored Enterprises | Level 3 |  |
Estimated fair value | 0 | 0
Mortgage-Backed Securities |  |
Estimated fair value | 185,703 | 145,314
Mortgage-Backed Securities | Level 1 |  |
Estimated fair value | 0 | 0
Mortgage-Backed Securities | Level 2 |  |
Estimated fair value | 185,703 | 145,314
Mortgage-Backed Securities | Level 3 |  |
Estimated fair value | 0 | 0
State and Political Subdivisions |  |
Estimated fair value | 118,835 | 92,428
State and Political Subdivisions | Level 1 |  |
Estimated fair value | 0 | 0
State and Political Subdivisions | Level 2 |  |
Estimated fair value | 118,835 | 92,428
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 | 1,372 | 1,320
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 | 1,372 | 1,320
Mutual funds held in deferred compensation trust | Level 3 |  |
Mutual funds held in deferred compensation trust | $ 0 | $ 0

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