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6. Fair Value, Loans Impaired (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Mortgage loans held for sale $ 1,740 $ 857
Impaired loans 22,449 23,442
Other real estate $ 0 118
Mortgage loans held for sale [Member]    
Valuation Technique Rate lock commitment  
Significant Unobservable Inputs N/A  
General Range of Significant Unobservable Input Values N/A  
Impaired loans [Member]    
Valuation Technique Appraised value and discounted cash flows  
Significant Unobservable Inputs Discounts to reflect current market conditions and ultimate collectibility  
General Range of Significant Unobservable Input Values 0 - 25%  
Other real estate [Member]    
Valuation Technique Appraised value  
Significant Unobservable Inputs Discounts to reflect current market conditions and estimated costs to sell  
General Range of Significant Unobservable Input Values 0 - 25%  
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 1,740 857
Impaired loans 22,449 23,442
Other real estate $ 0 $ 118