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Accounting Policies (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Segment
Payment
Dec. 31, 2012
Dec. 31, 2011
Accounting Policies [Abstract]      
Maturity period of certificates of deposit in other banks 18 months    
Charge off threshold for unsecured commercial loans considered uncollectible 90 days    
Charge off threshold for closed-end consumer loans and uncollectible loans 120 days    
Number of monthly payments before loan charge off 5    
Allowance for Loan Losses [Abstract]      
Estimate change impact to provision for loan loss requirement in the most likely scenario $ 5,900,000    
Other real estate owned [Abstract]      
Other real estate owned frequency of period reviews minimum 12 months    
Other Real Estate Owned Frequency Of Period Reviews maximum 18 months    
Maximum frequency of periodic reviews of real estate owned generally 24 months    
Goodwill [Roll Forward]      
Beginning balance, January 1 65,490,000 65,490,000 65,499,000
Acquisition adjustments 0 0 (9,000)
Ending balance, December 31 65,490,000 65,490,000 65,490,000
Finite-lived Intangible Assets [Roll Forward]      
Beginning balance, January 1 904,000    
Ending balance, December 31 690,000 904,000  
Segment Reporting [Abstract]      
Number of operating segments 1    
Core Deposits [Member]
      
Finite-lived Intangible Assets [Roll Forward]      
Beginning balance, January 1 904,000 1,117,000 1,342,000
Amortization (214,000) (213,000) (213,000)
Acquisition adjustments 0 0 (12,000)
Ending balance, December 31 690,000 904,000 1,117,000
Amortization of intangible assets for year one 200,000    
Amortization of intangible assets for year two 200,000    
Amortization of intangible assets for year three 200,000    
Amortization of intangible assets for year four $ 100,000    
Minimum [Member]
      
Allowance for Loan Losses [Abstract]      
Historical loan loss review period (in quarters) 4    
Maximum [Member]
      
Allowance for Loan Losses [Abstract]      
Historical loan loss review period (in quarters) 8    
Building [Member]
      
Property, Plant and Equipment [Line Items]      
Useful life of assets 40 years    
Furniture, fixtures, and equipment [Member] | Minimum [Member]
      
Property, Plant and Equipment [Line Items]      
Useful life of assets 2 years    
Furniture, fixtures, and equipment [Member] | Maximum [Member]
      
Property, Plant and Equipment [Line Items]      
Useful life of assets 10 years