Allowance for Loan and Lease Losses (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]  
Beginning balance $ 529
Charge-offs 1
Recoveries 170
Provision (415)
Ending balance 285
Narrative [Abstract]  
Historical period for loss rates used in loan grading system (in months) 36 months
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loans, Commercial, Owner-Occupied [Member]
  
Financing Receivable, Allowance for Credit Losses [Roll Forward]  
Beginning balance 347
Charge-offs 1
Recoveries 46
Provision (207)
Ending balance 187
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loans, Commercial-Other [Member]
  
Financing Receivable, Allowance for Credit Losses [Roll Forward]  
Beginning balance 46
Charge-offs 0
Recoveries 44
Provision (56)
Ending balance 34
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
  
Financing Receivable, Allowance for Credit Losses [Roll Forward]  
Beginning balance 136
Charge-offs 0
Recoveries 80
Provision (152)
Ending balance 64
Unallocated Segment [Member] | Unallocated [Member]
  
Financing Receivable, Allowance for Credit Losses [Roll Forward]  
Beginning balance 0
Charge-offs 0
Recoveries 0
Provision 0
Ending balance $ 0