Fair Value (Details 3) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Fair value measurements for financial instruments
Recorded Investment	$ 4,793	$ 7,338
Fair Value, Measurements, Nonrecurring | Residential Real Estate
Fair value measurements for financial instruments
Recorded Investment	117	77
Fair Value, Measurements, Nonrecurring | Consumer
Fair value measurements for financial instruments
Recorded Investment	14	2
Fair Value, Measurements, Nonrecurring | Sales Comparison Valuation | Commercial real estate
Fair value measurements for financial instruments
Recorded Investment	$ 23	$ 23
Fair Value Measurements Valuation Technique(s) Description	Sales Comparison	Sales comparison
Fair Value, Measurements, Nonrecurring | Sales Comparison Valuation | Commercial real estate | Weighted Average
Fair value measurements for financial instruments
Adjustment for differences between earning multiplier and comparable sales, Percent	(24.02%)	(24.02%)
Fair Value, Measurements, Nonrecurring | Sales Comparison Valuation | Residential Real Estate
Fair value measurements for financial instruments
Recorded Investment	$ 117	$ 77
Fair Value Measurements Valuation Technique(s) Description	Sales comparison	Sales comparison
Fair Value, Measurements, Nonrecurring | Sales Comparison Valuation | Residential Real Estate | Minimum
Fair value measurements for financial instruments
Adjustment for differences between earning multiplier and comparable sales, Percent	(28.20%)	(12.97%)
Fair Value, Measurements, Nonrecurring | Sales Comparison Valuation | Residential Real Estate | Maximum
Fair value measurements for financial instruments
Adjustment for differences between earning multiplier and comparable sales, Percent	20.17%	14.22%
Fair Value, Measurements, Nonrecurring | Sales Comparison Valuation | Residential Real Estate | Weighted Average
Fair value measurements for financial instruments
Adjustment for differences between earning multiplier and comparable sales, Percent	(12.45%)	(3.38%)
Fair Value, Measurements, Nonrecurring | Sales Comparison Valuation | Consumer
Fair value measurements for financial instruments
Recorded Investment	$ 14	$ 2
Fair Value Measurements Valuation Technique(s) Description	Sales comparison	Sales comparison
Fair Value, Measurements, Nonrecurring | Sales Comparison Valuation | Consumer | Minimum
Fair value measurements for financial instruments
Adjustment for differences between earning multiplier and comparable sales, Percent	(16.18%)	(20.00%)
Fair Value, Measurements, Nonrecurring | Sales Comparison Valuation | Consumer | Maximum
Fair value measurements for financial instruments
Adjustment for differences between earning multiplier and comparable sales, Percent	16.18%	20.00%
Fair Value, Measurements, Nonrecurring | Sales Comparison Valuation | Consumer | Weighted Average
Fair value measurements for financial instruments
Adjustment for differences between earning multiplier and comparable sales, Percent	0.00%	0.00%
Fair Value, Measurements, Nonrecurring | Sales Comparison Valuation | Other Real Estate Owned Residential
Fair value measurements for financial instruments
Recorded Investment		$ 16
Fair Value Measurements Valuation Technique(s) Description		Sales comparison
Fair Value, Measurements, Nonrecurring | Sales Comparison Valuation | Other Real Estate Owned Residential | Minimum
Fair value measurements for financial instruments
Adjustment for differences between earning multiplier and comparable sales, Percent		(10.36%)
Fair Value, Measurements, Nonrecurring | Sales Comparison Valuation | Other Real Estate Owned Residential | Maximum
Fair value measurements for financial instruments
Adjustment for differences between earning multiplier and comparable sales, Percent		17.10%
Fair Value, Measurements, Nonrecurring | Sales Comparison Valuation | Other Real Estate Owned Residential | Weighted Average
Fair value measurements for financial instruments
Adjustment for differences between earning multiplier and comparable sales, Percent		(1.90%)
Fair Value, Measurements, Nonrecurring | Quoted price for loan relationship | Commercial real estate
Fair value measurements for financial instruments
Recorded Investment		$ 339
Fair Value Measurements Valuation Technique(s) Description		Quoted price for loan relationship
Fair Value, Measurements, Nonrecurring | Quoted price for loan relationship | Commercial real estate | Weighted Average
Fair value measurements for financial instruments
Adjustment for differences between earning multiplier and comparable sales, Percent		35.77%
Fair Value, Measurements, Nonrecurring | Quoted price for loan relationship | Commercial
Fair value measurements for financial instruments
Recorded Investment		$ 113
Fair Value Measurements Valuation Technique(s) Description		Quoted price for loan relationship
Fair Value, Measurements, Nonrecurring | Quoted price for loan relationship | Commercial | Weighted Average
Fair value measurements for financial instruments
Adjustment for differences between earning multiplier and comparable sales, Percent		34.98%