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Fair Value (Financial Instruments Measured At Fair Value On A Non-Recurring Basis) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Commercial [Member]    
Impaired loans:    
Impaired loans at Fair Value $ 111 $ 115
Impaired loans:    
Valuation Technique(s) Comparable sales approach  
Commercial [Member] | Weighted Average [Member]    
Impaired loans:    
Fair Value Inputs, Adjustment for differences between the comparable market transactions 3.48% 3.48%
Single-Family Residential [Member]    
Impaired loans:    
Impaired loans at Fair Value $ 115 $ 116
Impaired loans:    
Valuation Technique(s) Comparable sales approach  
Single-Family Residential [Member] | Minimum [Member]    
Impaired loans:    
Fair Value Inputs, Adjustment for differences between the comparable market transactions 1.81% 1.81%
Single-Family Residential [Member] | Maximum [Member]    
Impaired loans:    
Fair Value Inputs, Adjustment for differences between the comparable market transactions 3.61% 3.61%
Single-Family Residential [Member] | Weighted Average [Member]    
Impaired loans:    
Fair Value Inputs, Adjustment for differences between the comparable market transactions 2.91% 2.91%
Non-Owner Occupied [Member]    
Impaired loans:    
Impaired loans at Fair Value $ 2,815 $ 2,832
Impaired loans:    
Valuation Technique(s) Comparable sales approach  
Non-Owner Occupied [Member] | Minimum [Member]    
Impaired loans:    
Fair Value Inputs, Adjustment for differences between the comparable market transactions 3.48% 3.48%
Non-Owner Occupied [Member] | Maximum [Member]    
Impaired loans:    
Fair Value Inputs, Adjustment for differences between the comparable market transactions 9.64% 9.64%
Non-Owner Occupied [Member] | Weighted Average [Member]    
Impaired loans:    
Fair Value Inputs, Adjustment for differences between the comparable market transactions 5.15% 5.15%