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Borrowed Funds (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Borrowed Funds [Abstract]                
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Maximum Amount Available $ 248,933,000              
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Amount of Available, Unused Funds 67,532,000              
Disclosure of Repurchase Agreements [Abstract]                
Repurchase Agreements for municipal and commercial customers 101,504,000 90,515,000            
Total 282,905,000 265,663,000 304,749,000 248,926,000 240,151,000 255,616,000 249,336,000 217,534,000
Municipal and commercial customers (in hundredths) 0.20%-1.89% 0.40%-2.09%            
Range of Repurchase agreements' maturity dates one to 365              
Amount of Line of credit with correspondent banks   48,000,000            
Credit facility with Federal Reserve Bank 115,839,000              
Federal Home Loan Bank, Advances, Maturities Summary [Abstract]                
2013 Maturity 41,245,000 0            
2014 Maturity 10,000,000 10,000,000            
2015 Maturity 40,000,000 40,000,000            
2016 Maturity 30,000,000 30,000,000            
2017 Maturity 30,000,000 50,163,000            
2018 and thereafter 30,156,000              
Total $ 181,401,000 $ 175,148,000            
Federal Home Loan Bank, Advances, Maturities Summary by Interest Rate Type, Interest Rate Range [Abstract]                
2013 (in hundredths) 0.16%-0.31% -            
2016 (in hundredths) 2.36%-2.44% 1.31%-1.39%            
2017 (in hundredths) 0.99%-3.69% 0.00%-3.69%            
2018 and thereafter (in hundredths) 0.00%-3.25%