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Loans and Allowance for loan losses (Effect On Loan Loss Provision, Changes In Methodology In Prior Periods) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Provision for loan losses $ 282 $ 55
Calculated Provision Based On Prior Methodology [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Provision for loan losses   (990)
Difference [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Provision for loan losses   1,045
Commercial [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Provision for loan losses 240 334
Commercial [Member] | Calculated Provision Based On Prior Methodology [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Provision for loan losses   234
Commercial [Member] | Difference [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Provision for loan losses   100
Commercial Real Estate [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Provision for loan losses (501) (260)
Commercial Real Estate [Member] | Calculated Provision Based On Prior Methodology [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Provision for loan losses   (1,006)
Commercial Real Estate [Member] | Difference [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Provision for loan losses   746
Consumer [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Provision for loan losses 464 (83)
Consumer [Member] | Calculated Provision Based On Prior Methodology [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Provision for loan losses   (259)
Consumer [Member] | Difference [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Provision for loan losses   176
Residential [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Provision for loan losses $ 79 64
Residential [Member] | Calculated Provision Based On Prior Methodology [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Provision for loan losses   41
Residential [Member] | Difference [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Provision for loan losses   $ 23