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Loans, net and allowance for loan losses, Changes in the Allowance for Loan Losses Account by Major Classification of Loans (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Changes in the allowance for loan losses account by major classification of loan [Roll Forward]          
Beginning Balance $ 5,589 $ 4,356 $ 5,349 $ 4,100  
Charge-offs (84) (23) (505) (199)  
Recoveries 21 16 37 27  
Provisions 390 804 1,035 1,225  
Ending balance 5,916 5,153 5,916 5,153  
Allowance for Loan and Lease Losses [Roll Forward]          
Ending balance 5,916 5,153 5,916 5,153  
Ending balance: individually evaluated for impairment 726   726   810
Ending balance: collectively evaluated for impairment 5,190   5,190   4,539
Loans receivable [Abstract]          
Ending balance 457,054   457,054   445,103
Ending balance: individually evaluated for impairment 12,868   12,868   17,492
Ending balance: collectively evaluated for impairment 444,186   444,186   427,611
Commercial [Member]
          
Changes in the allowance for loan losses account by major classification of loan [Roll Forward]          
Beginning Balance 2,186 1,695 2,047 1,696  
Charge-offs (5)   (207) (58)  
Recoveries 1   1    
Provisions (65) 410 276 467  
Ending balance 2,117 2,105 2,117 2,105  
Allowance for Loan and Lease Losses [Roll Forward]          
Ending balance 2,117 2,105 2,117 2,105  
Ending balance: individually evaluated for impairment 485   485   698
Ending balance: collectively evaluated for impairment 1,632   1,632   1,349
Loans receivable [Abstract]          
Ending balance 167,724   167,724   160,828
Ending balance: individually evaluated for impairment 6,650   6,650   8,433
Ending balance: collectively evaluated for impairment 161,074   161,074   152,395
Real Estate Commercial [Member]
          
Changes in the allowance for loan losses account by major classification of loan [Roll Forward]          
Beginning Balance 1,802 1,468 1,515 1,384  
Charge-offs     (100) (56)  
Recoveries   1   2  
Provisions 168 116 555 255  
Ending balance 1,970 1,585 1,970 1,585  
Allowance for Loan and Lease Losses [Roll Forward]          
Ending balance 1,970 1,585 1,970 1,585  
Ending balance: individually evaluated for impairment 122   122   40
Ending balance: collectively evaluated for impairment 1,848   1,848   1,475
Loans receivable [Abstract]          
Ending balance 154,442   154,442   145,554
Ending balance: individually evaluated for impairment 4,799   4,799   7,832
Ending balance: collectively evaluated for impairment 149,643   149,643   137,722
Real Estate Residential [Member]
          
Changes in the allowance for loan losses account by major classification of loan [Roll Forward]          
Beginning Balance 776 732 761 726  
Charge-offs     (21) (8)  
Recoveries   1   1  
Provisions 43 1 79 15  
Ending balance 819 734 819 734  
Allowance for Loan and Lease Losses [Roll Forward]          
Ending balance 819 734 819 734  
Ending balance: individually evaluated for impairment 118   118   71
Ending balance: collectively evaluated for impairment 701   701   690
Loans receivable [Abstract]          
Ending balance 115,033   115,033   118,125
Ending balance: individually evaluated for impairment 1,418   1,418   1,226
Ending balance: collectively evaluated for impairment 113,615   113,615   116,899
Consumer [Member]
          
Changes in the allowance for loan losses account by major classification of loan [Roll Forward]          
Beginning Balance 198 284 198 243  
Charge-offs (79) (23) (177) (77)  
Recoveries 20 14 36 24  
Provisions 58 14 140 99  
Ending balance 197 289 197 289  
Allowance for Loan and Lease Losses [Roll Forward]          
Ending balance 197 289 197 289  
Ending balance: individually evaluated for impairment 1   1   1
Ending balance: collectively evaluated for impairment 196   196   197
Loans receivable [Abstract]          
Ending balance 19,855   19,855   20,596
Ending balance: individually evaluated for impairment 1   1   1
Ending balance: collectively evaluated for impairment 19,854   19,854   20,595
Unallocated [Member]
          
Changes in the allowance for loan losses account by major classification of loan [Roll Forward]          
Beginning Balance 627 177 828 51  
Provisions 186 263 (15) 389  
Ending balance 813 440 813 440  
Allowance for Loan and Lease Losses [Roll Forward]          
Ending balance 813 440 813 440  
Ending balance: collectively evaluated for impairment $ 813   $ 813   $ 828