Fair Value Measurements (Fair Value Inputs, Assets, Quantitative Information) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Jun. 30, 2016	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired loans	$ 1,523	$ 4,217
Other real estate owned	1,677	3,274	$ 2,993	$ 3,871	$ 4,040	$ 3,309
Level 3 | Impaired Loans
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired loans	$ 85	$ 50
Valuation Techniques	Market approach	Market approach
Unobservable Input	Appraised value less selling costs of 5% to 10% Additional discounts of 5% to 50% to appraised value to reflect liquidation value	Appraised value less selling costs of 5% to 10% Additional discounts of 5% to 50% to appraised value to reflect liquidation value
Level 3 | Impaired Loans | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Selling costs (as a percent)	5.00%	5.00%
Discount to appraised value (as a percent)	5.00%	5.00%
Level 3 | Impaired Loans | Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Selling costs (as a percent)	10.00%	10.00%
Discount to appraised value (as a percent)	50.00%	50.00%
Level 3 | Other Real Estate Owned
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Other real estate owned	$ 1,677	$ 3,274
Valuation Techniques	Market approach	Market approach
Unobservable Input	Appraised value less selling costs of 5% to 10%	Appraised value less selling costs of 5% to 10%
Level 3 | Other Real Estate Owned | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Selling costs (as a percent)	5.00%	5.00%
Level 3 | Other Real Estate Owned | Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Selling costs (as a percent)	10.00%	10.00%