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Fair Value Measurements, Quantitative Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Impaired Loans [Member] | Commercial Real Estate [Member] | Income Approach [Member]  
Quantitative Information [Abstract]  
Impaired Loans $ 2,595
Unobservable inputs Capitalization Rate
Impaired Loans [Member] | Commercial Real Estate [Member] | Income Approach [Member] | Minimum [Member]  
Quantitative Information [Abstract]  
Capitalization rate 3.25%
Impaired Loans [Member] | Commercial Real Estate [Member] | Income Approach [Member] | Maximum [Member]  
Quantitative Information [Abstract]  
Capitalization rate 3.25%
Impaired Loans [Member] | Commercial Real Estate [Member] | Income Approach [Member] | Weighted Average [Member]  
Quantitative Information [Abstract]  
Capitalization rate 3.25%
Impaired Loans [Member] | Residential 1st Mortgages [Member] | Sales Comparison Approach [Member]  
Quantitative Information [Abstract]  
Impaired Loans $ 997
Unobservable inputs Adjustment for Difference Between Comparable Sales
Impaired Loans [Member] | Residential 1st Mortgages [Member] | Sales Comparison Approach [Member] | Minimum [Member]  
Quantitative Information [Abstract]  
Adjustment for difference between comparable sales 1.00%
Impaired Loans [Member] | Residential 1st Mortgages [Member] | Sales Comparison Approach [Member] | Maximum [Member]  
Quantitative Information [Abstract]  
Adjustment for difference between comparable sales 4.00%
Impaired Loans [Member] | Residential 1st Mortgages [Member] | Sales Comparison Approach [Member] | Weighted Average [Member]  
Quantitative Information [Abstract]  
Adjustment for difference between comparable sales 2.00%
Impaired Loans [Member] | Home Equity Lines and Loans [Member] | Sales Comparison Approach [Member]  
Quantitative Information [Abstract]  
Impaired Loans $ 75
Unobservable inputs Adjustment for Difference Between Comparable Sales
Impaired Loans [Member] | Home Equity Lines and Loans [Member] | Sales Comparison Approach [Member] | Minimum [Member]  
Quantitative Information [Abstract]  
Adjustment for difference between comparable sales 1.00%
Impaired Loans [Member] | Home Equity Lines and Loans [Member] | Sales Comparison Approach [Member] | Maximum [Member]  
Quantitative Information [Abstract]  
Adjustment for difference between comparable sales 2.00%
Impaired Loans [Member] | Home Equity Lines and Loans [Member] | Sales Comparison Approach [Member] | Weighted Average [Member]  
Quantitative Information [Abstract]  
Adjustment for difference between comparable sales 2.00%
Impaired Loans [Member] | Commercial [Member] | Income Approach [Member]  
Quantitative Information [Abstract]  
Impaired Loans $ 1,514
Unobservable inputs Capitalization Rate
Impaired Loans [Member] | Commercial [Member] | Income Approach [Member] | Minimum [Member]  
Quantitative Information [Abstract]  
Capitalization rate 2.95%
Impaired Loans [Member] | Commercial [Member] | Income Approach [Member] | Maximum [Member]  
Quantitative Information [Abstract]  
Capitalization rate 8.70%
Impaired Loans [Member] | Commercial [Member] | Income Approach [Member] | Weighted Average [Member]  
Quantitative Information [Abstract]  
Capitalization rate 3.40%
Other Real Estate [Member] | Real Estate Construction [Member] | Sales Comparison Approach [Member]  
Quantitative Information [Abstract]  
Other Real Estate $ 873
Unobservable inputs Adjustment for Difference Between Comparable Sales
Other Real Estate [Member] | Real Estate Construction [Member] | Sales Comparison Approach [Member] | Minimum [Member]  
Quantitative Information [Abstract]  
Adjustment for difference between comparable sales 10.00%
Other Real Estate [Member] | Real Estate Construction [Member] | Sales Comparison Approach [Member] | Maximum [Member]  
Quantitative Information [Abstract]  
Adjustment for difference between comparable sales 10.00%
Other Real Estate [Member] | Real Estate Construction [Member] | Sales Comparison Approach [Member] | Weighted Average [Member]  
Quantitative Information [Abstract]  
Adjustment for difference between comparable sales 10.00%