Loans (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Schedule of allowances for loan losses by portfolio segment        
Beginning balance $ 4,246 $ 4,028 $ 4,082 $ 4,031
Provision for possible loan losses 205 190 411 470
Charge-offs (85) (178) (164) (494)
Recoveries 105 14 142 47
Net charge-offs 20 (164) (22) (447)
Ending balance 4,471 4,054 4,471 4,054
Commercial [Member]
       
Schedule of allowances for loan losses by portfolio segment        
Beginning balance 976 996 1,024 1,179
Provision for possible loan losses (78) 118 (127) 129
Charge-offs (11) (103) (15) (307)
Recoveries 9 1 14 11
Net charge-offs (2) (102) (1) (296)
Ending balance 896 1,012 896 1,012
Commercial real estate [Member]
       
Schedule of allowances for loan losses by portfolio segment        
Beginning balance 1,649 1,513 1,673 1,183
Provision for possible loan losses 278 88 268 418
Charge-offs 0 (43) (14) (43)
Recoveries 0 0 0 0
Net charge-offs 0 (43) (14) (43)
Ending balance 1,927 1,558 1,927 1,558
Residential real estate [Member]
       
Schedule of allowances for loan losses by portfolio segment        
Beginning balance 939 1,067 894 1,057
Provision for possible loan losses 87 (275) 172 (206)
Charge-offs (59) (16) (104) (84)
Recoveries 84 0 89 9
Net charge-offs 25 (16) (15) (75)
Ending balance 1,051 776 1,051 776
Construction & land development [Member]
       
Schedule of allowances for loan losses by portfolio segment        
Beginning balance 184 158 180 80
Provision for possible loan losses 33 114 37 34
Charge-offs 0 0 0 (60)
Recoveries 0 0 0 27
Net charge-offs 0 0 0 (33)
Ending balance 217 272 217 272
Consumer [Member]
       
Schedule of allowances for loan losses by portfolio segment        
Beginning balance 74 83 78 213
Provision for possible loan losses (7) 1 (22) 59
Charge-offs (15) (16) (31) 0
Recoveries 12 13 39 0
Net charge-offs (3) (3) 8 0
Ending balance 64 81 64 81
Unallocated [Member]
       
Schedule of allowances for loan losses by portfolio segment        
Beginning balance 424 211 233 319
Provision for possible loan losses (108) 144 83 36
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Net charge-offs 0 0 0 0
Ending balance $ 316 $ 355 $ 316 $ 355