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Fair Value of Financial Instruments, Fair Values of Financial Instruments, Assets, Quantitative Information (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
MSRs [Member] | Market Approach [Member] | Recurring [Member]    
Quantitative Information about Level 3 Fair Value Measurements [Abstract]    
Fair value estimate $ 473 $ 557
Valuation techniques Market Approach Market Approach
Unobservable input Weighted average prepayment speed Weighted average prepayment speed
Weighted average 3.95% 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 25.50% 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 1,597 2,136
Impaired Loans [Member] | Nonrecurring [Member] | Carrying Value [Member]    
Quantitative Information about Level 3 Fair Value Measurements [Abstract]    
Fair value estimate $ 1,597 $ 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 26.00% 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 20.90% 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 691 767
Real Estate Acquired Through Foreclosure [Member] | Nonrecurring [Member] | Carrying Value [Member]    
Quantitative Information about Level 3 Fair Value Measurements [Abstract]    
Fair value estimate $ 691 $ 767