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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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