Fair Value Measurements (Fair Value of Assets Measured on Nonrecurring Basis) (Details) - Fair Value, Inputs, Level 3 [Member] - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Appraisal Of Collateral [Member]
Impaired loans:
Impaired loans	$ 577	$ 3,839
Other real estate owned	$ 979	$ 1,222
Appraisal Of Collateral [Member] | Maximum [Member]
Impaired loans:
Impaired loans, Appraisal adjustment, Range	17.00%	17.00%
Impaired loans, Liquidation expense, Range	10.00%	10.00%
Other real estate owned, Appraisal adjustment, Range	40.00%	40.00%
Other real estate owned, Liquidation expense, Range	10.00%	10.00%
Appraisal Of Collateral [Member] | Minimum [Member]
Impaired loans:
Impaired loans, Appraisal adjustment, Range	0.00%	0.00%
Impaired loans, Liquidation expense, Range	0.00%	0.00%
Other real estate owned, Appraisal adjustment, Range	15.00%	15.00%
Other real estate owned, Liquidation expense, Range	5.00%	5.00%
Discounted Cash Flow Analysis [Member]
Impaired loans:
Impaired loans	$ 5,900	$ 5,902
Discounted Cash Flow Analysis [Member] | Maximum [Member]
Impaired loans:
Impaired loans, Discount rate, Range	7.25%	7.25%
Discounted Cash Flow Analysis [Member] | Minimum [Member]
Impaired loans:
Impaired loans, Discount rate, Range	4.00%	4.00%