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Allowance for Loan Losses (Details 1) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Summary of Primary Segments of Loan Portfolio              
Individually evaluated for impairment $ 3,053   $ 3,870         
Collectively evaluated for impairment 681,753   659,867        
Total Loans 684,806   663,737        
Specific reserve allocation 891   968        
General reserve allocation 12,426   13,655        
Total allowance for loan losses 13,317 13,778 14,623    16,958 18,025 19,765
Commercial [Member]
             
Summary of Primary Segments of Loan Portfolio              
Individually evaluated for impairment               
Collectively evaluated for impairment 95,444   83,124        
Total Loans 95,444   83,124        
Specific reserve allocation      0        
General reserve allocation 2,352   2,365        
Total allowance for loan losses 2,352 2,483 2,365   4,554 5,687 3,851
Commercial loans secured by real estate [Member]
             
Summary of Primary Segments of Loan Portfolio              
Individually evaluated for impairment 3,053   3,870         
Collectively evaluated for impairment 354,757   345,908        
Total Loans 357,810   349,778        
Specific reserve allocation 891   968        
General reserve allocation 7,487   8,432        
Total allowance for loan losses 8,378 8,555 9,400    9,227 9,108 12,717
Real estate-mortgage [Member]
             
Summary of Primary Segments of Loan Portfolio              
Individually evaluated for impairment               
Collectively evaluated for impairment 214,110   212,663        
Total Loans 214,110   212,663        
Specific reserve allocation      0        
General reserve allocation 1,206   1,270        
Total allowance for loan losses 1,206 1,250 1,270    1,294 1,250 1,117
Consumer [Member]
             
Summary of Primary Segments of Loan Portfolio              
Individually evaluated for impairment               
Collectively evaluated for impairment 17,442   18,172        
Total Loans 17,442   18,172        
Specific reserve allocation      0        
General reserve allocation 155   174        
Total allowance for loan losses 155 166 174    193 198 206
Allocation for General Risk [Member]
             
Summary of Primary Segments of Loan Portfolio              
Specific reserve allocation      0        
General reserve allocation 1,226   1,414        
Total allowance for loan losses $ 1,226 $ 1,324 $ 1,414    $ 1,690 $ 1,782 $ 1,874