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6. Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Estimated fair value $ 186,263 $ 194,578
Level 1    
Estimated fair value 0 0
Level 2    
Estimated fair value 186,013 194,328
Level 3    
Estimated fair value 250 250
Mortgage-backed securities    
Estimated fair value 70,700 52,103
Mortgage-backed securities | Level 1    
Estimated fair value 0 0
Mortgage-backed securities | Level 2    
Estimated fair value 70,700 52,103
Mortgage-backed securities | Level 3    
Estimated fair value 0 0
U.S. Government sponsored enterprises    
Estimated fair value 29,118 34,634
U.S. Government sponsored enterprises | Level 1    
Estimated fair value 0 0
U.S. Government sponsored enterprises | Level 2    
Estimated fair value 29,118 34,634
U.S. Government sponsored enterprises | Level 3    
Estimated fair value 0 0
State and political subdivisions    
Estimated fair value 86,195 107,591
State and political subdivisions | Level 1    
Estimated fair value 0 0
State and political subdivisions | Level 2    
Estimated fair value 86,195 107,591
State and political subdivisions | Level 3    
Estimated fair value 0 0
Trust preferred securities    
Estimated fair value 250 250
Trust preferred securities | Level 1    
Estimated fair value 0 0
Trust preferred securities | Level 2    
Estimated fair value 0 0
Trust preferred securities | Level 3    
Estimated fair value $ 250 $ 250