Fair Value Measurements, Quantitative Information (Details) - Appraised Collateral Values [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 3,024	$ 2,033
Valuation Technique(s)	Appraised Collateral Values	Appraised Collateral Values
Impaired Loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for time since appraisal	0.00%	0.00%
Selling costs	5.00%	5.00%
Holding period	0 months	6 months
Impaired Loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for time since appraisal	100.00%	65.00%
Selling costs	9.00%	9.00%
Holding period	24 months	12 months
Impaired Loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for time since appraisal	21.22%	28.98%
Selling costs	7.13%	7.56%
Holding period	8 months 9 days	11 months
Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 1,478	$ 839
Valuation Technique(s)	Appraised Collateral Values	Appraised Collateral Values
Other Real Estate Owned [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for time since appraisal	12.00%	10.00%
Other Real Estate Owned [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for time since appraisal	47.00%	67.00%
Other Real Estate Owned [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for time since appraisal	22.32%	25.45%