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3. Loans Impaired, Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Mortgage loans held for sale $ 857 $ 5,709
Impaired loans 23,442 25,772
Other real estate 118 283
Level 1    
Mortgage loans held for sale 0 0
Impaired loans 0 0
Other real estate 0 0
Level 2    
Mortgage loans held for sale 0 0
Impaired loans 0 0
Other real estate 0 0
Level 3    
Mortgage loans held for sale 857 5,709
Impaired loans 23,442 25,772
Other real estate $ 118 $ 283