Loans and Allowance for Loan Losses (Additional Information) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
industry
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for Loan and Lease Losses, Period Increase (Decrease) $ (474,000)    
Increase (Decrease) in Finance Receivables 192,200,000    
Number of Portfolio Concentration Industries 2    
Non-residential building operator loans expressed as a percentage of the total commercial real estate loans 26.00%    
Lodging loans expressed as a percentage of the total commercial real estate loans 27.00%    
Foregone interest 842,000 990,000 1,100,000
Residential real estate loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable in Process of Foreclosure 4,900,000 4,400,000  
Loans Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans restructured due to credit difficulties that are now performing 4,500,000 5,500,000  
Financing Receivables Impaired Troubled Debt Restructuring Non-Performing $ 1,500,000 $ 1,600,000  
Consumer loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
loans in foreclosure percentage of non-performing loans 61.00% 35.00%