Loans and Allowance for Loan Losses (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Dec. 31, 2010
Allowance for loan losses and recorded investment in loans by portfolio class based on impairment method            
Individually evaluated for impairment, Loan balance $ 8,785   $ 4,427      
Individually evaluated for impairment, Allowance 114   411      
Collectively evaluated for impairment, Loan balance 650,948   507,367      
Collectively evaluated for impairment, Allowance 5,865   4,365      
Total Loans Balance 659,733   511,794      
Total, Allowance 5,979 5,360 4,776 4,043 3,739 2,889
Commercial [Member]
           
Allowance for loan losses and recorded investment in loans by portfolio class based on impairment method            
Individually evaluated for impairment, Loan balance 121   155      
Individually evaluated for impairment, Allowance              
Collectively evaluated for impairment, Loan balance 27,066   20,471      
Collectively evaluated for impairment, Allowance 425   321      
Total Loans Balance 27,187   20,626      
Total, Allowance 425 390 321 321 294 261
Consumer [Member]
           
Allowance for loan losses and recorded investment in loans by portfolio class based on impairment method            
Individually evaluated for impairment, Loan balance 4           
Individually evaluated for impairment, Allowance              
Collectively evaluated for impairment, Loan balance 709   998      
Collectively evaluated for impairment, Allowance 22   16      
Total Loans Balance 713   998      
Total, Allowance 22 19 16 17 18 21
Residential one-to-four family [Member]
           
Allowance for loan losses and recorded investment in loans by portfolio class based on impairment method            
Individually evaluated for impairment, Loan balance 5,674   3,149      
Individually evaluated for impairment, Allowance 74   97      
Collectively evaluated for impairment, Loan balance 224,636   189,146      
Collectively evaluated for impairment, Allowance 1,124   889      
Total Loans Balance 230,310   192,295      
Total, Allowance 1,198 1,086 986 1,063 1,019 1,057
Commercial real estate [Member]
           
Allowance for loan losses and recorded investment in loans by portfolio class based on impairment method            
Individually evaluated for impairment, Loan balance 2,369           
Individually evaluated for impairment, Allowance              
Collectively evaluated for impairment, Loan balance 241,045   166,261      
Collectively evaluated for impairment, Allowance 2,832   1,969      
Total Loans Balance 243,414   166,261      
Total, Allowance 2,832 2,620 1,969 1,518 1,375 1,136
Construction [Member]
           
Allowance for loan losses and recorded investment in loans by portfolio class based on impairment method            
Individually evaluated for impairment, Loan balance              
Individually evaluated for impairment, Allowance              
Collectively evaluated for impairment, Loan balance 15,645   15,198      
Collectively evaluated for impairment, Allowance 192   188      
Total Loans Balance 15,645   15,198      
Total, Allowance 192 168 188 183 186 140
Equity lines of credit [Member]
           
Allowance for loan losses and recorded investment in loans by portfolio class based on impairment method            
Individually evaluated for impairment, Loan balance 617   1,123      
Individually evaluated for impairment, Allowance 40   314      
Collectively evaluated for impairment, Loan balance 61,464   48,892      
Collectively evaluated for impairment, Allowance 417   318      
Total Loans Balance 62,081   50,015      
Total, Allowance 457 375 632 314 317 236
Indirect auto [Member]
           
Allowance for loan losses and recorded investment in loans by portfolio class based on impairment method            
Individually evaluated for impairment, Loan balance              
Individually evaluated for impairment, Allowance              
Collectively evaluated for impairment, Loan balance 80,383   66,401      
Collectively evaluated for impairment, Allowance 804   664      
Total Loans Balance 80,383   66,401      
Total, Allowance 804 702 664 627 524 38
Unallocated [Member]
           
Allowance for loan losses and recorded investment in loans by portfolio class based on impairment method            
Individually evaluated for impairment, Loan balance             
Individually evaluated for impairment, Allowance             
Collectively evaluated for impairment, Loan balance             
Collectively evaluated for impairment, Allowance 49          
Total Loans Balance             
Total, Allowance $ 49          $ 6