Loans (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
Ending allowance balances attributable to loans:            
Individually evaluated for impairment $ 892   $ 522      
Collectively evaluated for impairment 3,769   3,560      
Total ending allowance balance 4,661 4,471 4,082 4,116 4,054 4,031
Loans:            
Loans individually evaluated for impairment 10,143   7,263      
Loans collectively evaluated for impairment 342,337   316,692      
Total ending Loans balance 352,480   323,955      
Commercial [Member]
           
Ending allowance balances attributable to loans:            
Individually evaluated for impairment 86   165      
Collectively evaluated for impairment 906   859      
Total ending allowance balance 992 896 1,024 968 1,012 1,179
Loans:            
Loans individually evaluated for impairment 3,915   4,605      
Loans collectively evaluated for impairment 94,068   85,223      
Total ending Loans balance 97,983   89,828      
Commercial Real Estate [Member]
           
Ending allowance balances attributable to loans:            
Individually evaluated for impairment 688   304      
Collectively evaluated for impairment 1,347   1,369      
Total ending allowance balance 2,035 1,927 1,673 1,474 1,558 1,183
Loans:            
Loans individually evaluated for impairment 4,911   2,476      
Loans collectively evaluated for impairment 113,376   103,856      
Total ending Loans balance 118,287   106,332      
Residential Real Estate [Member]
           
Ending allowance balances attributable to loans:            
Individually evaluated for impairment 57   53      
Collectively evaluated for impairment 959   841      
Total ending allowance balance 1,016 1,051 894 1,008 776 1,057
Loans:            
Loans individually evaluated for impairment 1,151   182      
Loans collectively evaluated for impairment 107,299   103,336      
Total ending Loans balance 108,450   103,518      
Construction & Land Development [Member]
           
Ending allowance balances attributable to loans:            
Individually evaluated for impairment 61   0      
Collectively evaluated for impairment 241   180      
Total ending allowance balance 302 217 180 235 272 213
Loans:            
Loans individually evaluated for impairment 166   0      
Loans collectively evaluated for impairment 21,296   18,061      
Total ending Loans balance 21,462   18,061      
Consumer [Member]
           
Ending allowance balances attributable to loans:            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 82   78      
Total ending allowance balance 82 64 78 78 81 80
Loans:            
Loans individually evaluated for impairment 0   0      
Loans collectively evaluated for impairment 6,298   6,216      
Total ending Loans balance 6,298   6,216      
Unallocated [Member]
           
Ending allowance balances attributable to loans:            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 234   233      
Total ending allowance balance $ 234 $ 316 $ 233 $ 353 $ 355 $ 319