Loans (Details Textual) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Loans (Textual) [Abstract]    
Percentage of outstanding principal balances of commercial real estate loans secured by owner-occupied properties 82.00%  
Troubled debt restructurings, loans $ 8,300,000 $ 8,500,000
Reserves allocated to customers whose loan terms are modified in troubled debt restructurings 600,000 516,000
Loans classified as troubled debt restructurings - Modified Terms 7,600,000  
Loans classified as troubled debt restructurings - Nonaccrual Status 631,000  
Outstanding balance of commercial loans classified under credit risk, minimum amount 275,000  
Loans listed as not rated under risk category, maximum amount 275,000  
Non-performing loans past due days and greater 90 days  
Loans serviced for others $ 56,000,000 $ 50,000,000