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Premises And Equipment (Detail Of Premises And Equipment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Land $ 2,474 $ 2,474  
Buildings and leasehold improvements 27,448 25,034  
Furniture and equipment 8,738 8,085  
Less: accumulated depreciation (15,241) (14,919)  
Total 23,419 20,674  
Depreciation expense $ 1,551 $ 1,710 $ 1,629
Minimum [Member] | Buildings And Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful lives (in years) 5 years    
Minimum [Member] | Furniture And Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful lives (in years) 3 years    
Maximum [Member] | Buildings And Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful lives (in years) 39 years    
Maximum [Member] | Furniture And Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful lives (in years) 7 years