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Loans and Related Allowance for Loan Losses (Narrative) (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
loan
Mar. 31, 2015
USD ($)
contract
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Financing Receivable, Modifications [Line Items]        
Commercial amount benchmark minimum for internal annual review $ 500,000      
Commercial amount benchmark minimum for annual review by independent reviewer 1,000,000      
Commercial amount benchmark minimum criticized relationships for annual review by independent reviewer 500,000      
Commerical amount benchmark internal impairment review 500,000      
Commerical amount benchmark internal impairment review minimum relationship amount 750,000      
Commercial amount benchmark to require external appraisal 500,000      
Nonaccrual loans 16,185,000   $ 15,498,000  
Reduction of the ALL resulting from change in evaluation method of loans 2,387      
Loans in process of foreclosure $ 1,700,000   $ 1,800,000  
Accruing loans past due 30 days or greater as percent of loan portfolio 0.46%   0.76%  
Total allowance for loan losses $ 12,256,000 $ 11,751,000 $ 11,922,000 $ 12,065,000
Partial Charge Off [Member]        
Financing Receivable, Modifications [Line Items]        
Nonaccrual loans $ 4,300,000   4,100,000  
New TDR [Member]        
Financing Receivable, Modifications [Line Items]        
Financing receivable, modifications, number of contracts 2 5    
Pre Existing TDR Loans Remodified After Maturity [Member]        
Financing Receivable, Modifications [Line Items]        
Financing receivable, modifications, number of contracts 1 8    
Unallocated [Member]        
Financing Receivable, Modifications [Line Items]        
Total allowance for loan losses $ 500,000      
Commercial real estate- non owner-occupied [Member]        
Financing Receivable, Modifications [Line Items]        
Nonaccrual loans $ 1,092,000   $ 1,308,000