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	Jun. 30, 2020	Dec. 31, 2019
Appraisal Of Collateral [Member]
Impaired loans:
Impaired loans	$ 1,877	$ 2,489
Other real estate owned	$ 38	$ 74
Appraisal Of Collateral [Member] | Maximum [Member]
Impaired loans:
Other real estate owned, Appraisal adjustment, Range	19.00%	31.00%
Appraisal Of Collateral [Member] | Minimum [Member]
Impaired loans:
Impaired loans, Appraisal adjustment, Range	10.00%
Other real estate owned, Appraisal adjustment, Range	0.00%	0.00%
Other real estate owned, Liquidation expense, Range		10.00%
Appraisal Of Collateral [Member] | Weighted Average [Member]
Impaired loans:
Impaired loans, Appraisal adjustment, Range	10.00%
Other real estate owned, Appraisal adjustment, Range	19.00%
Discounted Cash Flow Analysis [Member]
Impaired loans:
Impaired loans	$ 2,549	$ 2,599
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%
Discounted Cash Flow Analysis [Member] | Weighted Average [Member]
Impaired loans:
Impaired loans, Discount rate, Range	6.00%