Fair Value Measurements (Fair Value of Assets Measured on Nonrecurring Basis) (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Impaired loans:
Impaired loans	$ 6,190	$ 8,935
Other real estate owned	$ 1,809	$ 2,477
Maximum [Member]
Impaired loans:
Impaired loans, Appraisal adjustment, Range	30.00%	30.00%
Impaired loans, Liquidation expense, Range	10.00%	10.00%
Other real estate owned, Appraisal adjustment, Range	30.00%	30.00%
Other real estate owned, Liquidation expense, Range	10.00%	10.00%
Minimum [Member]
Impaired loans:
Impaired loans, Appraisal adjustment, Range	20.00%	20.00%
Impaired loans, Liquidation expense, Range	5.00%	5.00%
Other real estate owned, Appraisal adjustment, Range	20.00%	20.00%
Other real estate owned, Liquidation expense, Range	5.00%	5.00%