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Fair Value of Financial Instruments, Assets, Quantitative Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
MSRs [Member]      
Quantitative Information about Level 3 Fair Value Measurements [Abstract]      
Fair Value Estimate $ 477 $ 557 $ 623
Valuation adjustment (80) (66)  
MSRs [Member] | Market Approach [Member] | Recurring [Member]      
Quantitative Information about Level 3 Fair Value Measurements [Abstract]      
Fair Value Estimate $ 477 $ 557  
Valuation Techniques Market Approach Market Approach  
Unobservable Input Weighted average prepayment speed Weighted average prepayment speed  
Weighted average 3.94% 3.95%  
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 33.00% 2.00%  
Impaired Loans [Member] | Nonrecurring [Member] | Weighted Average [Member]      
Quantitative Information about Level 3 Fair Value Measurements [Abstract]      
Weighted average discount rate 14.50% 2.00%  
Impaired Loans [Member] | Nonrecurring [Member] | Quoted Prices (Level 1) [Member]      
Quantitative Information about Level 3 Fair Value Measurements [Abstract]      
Fair Value Estimate $ 0 $ 0  
Impaired Loans [Member] | Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Quantitative Information about Level 3 Fair Value Measurements [Abstract]      
Fair Value Estimate 0 0  
Impaired Loans [Member] | Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Quantitative Information about Level 3 Fair Value Measurements [Abstract]      
Fair Value Estimate 2,793 2,136  
Impaired Loans [Member] | Nonrecurring [Member] | Carrying Value [Member]      
Quantitative Information about Level 3 Fair Value Measurements [Abstract]      
Fair Value Estimate $ 2,793 $ 2,136  
Real Estate Acquired Through Foreclosure [Member] | Nonrecurring [Member] | Minimum [Member]      
Quantitative Information about Level 3 Fair Value Measurements [Abstract]      
Weighted average discount rate 0.00% 0.00%  
Real Estate Acquired Through Foreclosure [Member] | Nonrecurring [Member] | Maximum [Member]      
Quantitative Information about Level 3 Fair Value Measurements [Abstract]      
Weighted average discount rate 22.00% 10.00%  
Real Estate Acquired Through Foreclosure [Member] | Nonrecurring [Member] | Weighted Average [Member]      
Quantitative Information about Level 3 Fair Value Measurements [Abstract]      
Weighted average discount rate 11.50% 10.00%  
Real Estate Acquired Through Foreclosure [Member] | Nonrecurring [Member] | Quoted Prices (Level 1) [Member]      
Quantitative Information about Level 3 Fair Value Measurements [Abstract]      
Fair Value Estimate $ 0 $ 0  
Real Estate Acquired Through Foreclosure [Member] | Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Quantitative Information about Level 3 Fair Value Measurements [Abstract]      
Fair Value Estimate 0 0  
Real Estate Acquired Through Foreclosure [Member] | Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Quantitative Information about Level 3 Fair Value Measurements [Abstract]      
Fair Value Estimate 178 767  
Real Estate Acquired Through Foreclosure [Member] | Nonrecurring [Member] | Carrying Value [Member]      
Quantitative Information about Level 3 Fair Value Measurements [Abstract]      
Fair Value Estimate $ 178 $ 767