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Fair Value of Financial Instruments, Fair Values of Financial Instruments, Assets, Quantitative Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2016
Recurring [Member] | Level 3 [Member]                
Quantitative Information about Level 3 Fair Value Measurements [Abstract]                
Weighted average prepayment speed     3.94%   3.94%      
Mortgage Servicing Rights [Member]                
Quantitative Information about Level 3 Fair Value Measurements [Abstract]                
Fair value estimate $ 501 $ 511 $ 501 $ 511 $ 477 $ 499 $ 546 $ 557
Valuation adjustment 2 (35) 24 (46)        
Interest Rate Lock Commitments [Member]                
Quantitative Information about Level 3 Fair Value Measurements [Abstract]                
Fair value estimate 168 23 168 23 $ 22 $ 184 $ 169 $ 162
Valuation adjustment (16) $ (146) $ 146 $ (139)        
Impaired loans [Member] | Nonrecurring [Member] | Minimum [Member]                
Quantitative Information about Level 3 Fair Value Measurements [Abstract]                
Weighted average discount rate     0.00%   0.00%      
Impaired loans [Member] | Nonrecurring [Member] | Maximum [Member]                
Quantitative Information about Level 3 Fair Value Measurements [Abstract]                
Weighted average discount rate     27.00%   33.00%      
Impaired loans [Member] | Nonrecurring [Member] | Weighted Average [Member]                
Quantitative Information about Level 3 Fair Value Measurements [Abstract]                
Weighted average discount rate     11.00%   14.50%      
Impaired loans [Member] | Nonrecurring [Member] | Level 3 [Member]                
Quantitative Information about Level 3 Fair Value Measurements [Abstract]                
Fair value estimate 9,305   $ 9,305   $ 2,793      
Impaired loans [Member] | Nonrecurring [Member] | Carrying Value [Member]                
Quantitative Information about Level 3 Fair Value Measurements [Abstract]                
Fair value estimate 9,305   $ 9,305   $ 2,793      
Foreclosed real estate [Member] | Nonrecurring [Member] | Minimum [Member]                
Quantitative Information about Level 3 Fair Value Measurements [Abstract]                
Weighted average discount rate     0.00%   0.00%      
Foreclosed real estate [Member] | Nonrecurring [Member] | Maximum [Member]                
Quantitative Information about Level 3 Fair Value Measurements [Abstract]                
Weighted average discount rate     9.00%   22.00%      
Foreclosed real estate [Member] | Nonrecurring [Member] | Weighted Average [Member]                
Quantitative Information about Level 3 Fair Value Measurements [Abstract]                
Weighted average discount rate     8.60%   11.50%      
Foreclosed real estate [Member] | Nonrecurring [Member] | Level 3 [Member]                
Quantitative Information about Level 3 Fair Value Measurements [Abstract]                
Fair value estimate 171   $ 171   $ 178      
Foreclosed real estate [Member] | Nonrecurring [Member] | Carrying Value [Member]                
Quantitative Information about Level 3 Fair Value Measurements [Abstract]                
Fair value estimate 171   171   178      
Market Approach [Member] | Mortgage Servicing Rights [Member] | Recurring [Member] | Level 3 [Member]                
Quantitative Information about Level 3 Fair Value Measurements [Abstract]                
Fair value estimate 501   501   477      
Market Approach [Member] | Interest Rate Lock Commitments [Member] | Recurring [Member] | Level 3 [Member]                
Quantitative Information about Level 3 Fair Value Measurements [Abstract]                
Fair value estimate $ 168   $ 168   $ 22      
Market Approach [Member] | Interest Rate Lock Commitments [Member] | Recurring [Member] | Level 3 [Member] | Minimum [Member]                
Quantitative Information about Level 3 Fair Value Measurements [Abstract]                
Range of pull through rate     80.00%   80.00%      
Market Approach [Member] | Interest Rate Lock Commitments [Member] | Recurring [Member] | Level 3 [Member] | Maximum [Member]                
Quantitative Information about Level 3 Fair Value Measurements [Abstract]                
Range of pull through rate     95.00%   95.00%      
Market Approach [Member] | Interest Rate Lock Commitments [Member] | Recurring [Member] | Level 3 [Member] | Weighted Average [Member]                
Quantitative Information about Level 3 Fair Value Measurements [Abstract]                
Range of pull through rate     90.00%   90.00%