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Allowance for Credit Losses - Allowance for Credit Losses (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
quarter
Mar. 31, 2012
Dec. 31, 2012
quarter
Financing Receivable, Allowance for Credit Losses [Line Items]      
Lookback period used in reserve analysis 20   16
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Allowance for credit losses, beginning balance $ 10,133,000 $ 11,396,000  
Provision charged to operations 0 400,000  
Losses charged to allowance (715,000) (1,669,000)  
Recoveries 71,000 158,000  
Allowance for credit losses, ending balance 9,489,000 10,285,000  
Ending balance: individually evaluated for impairment 605,000   510,000
Ending balance: collectively evaluated for impairment 8,884,000   9,623,000
Commercial
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Allowance for credit losses, beginning balance 2,676,000 2,266,000  
Provision charged to operations 241,000 485,000  
Losses charged to allowance (698,000) (106,000)  
Recoveries 42,000 69,000  
Allowance for credit losses, ending balance 2,261,000 2,714,000  
Ending balance: individually evaluated for impairment 35,000   40,000
Ending balance: collectively evaluated for impairment 2,226,000   2,636,000
Real Estate Portfolio Segment
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Allowance for credit losses, beginning balance 5,877,000 7,155,000  
Provision charged to operations (341,000) (542,000)  
Losses charged to allowance 0 (1,473,000)  
Recoveries 0 0  
Allowance for credit losses, ending balance 5,536,000 5,140,000  
Ending balance: individually evaluated for impairment 552,000   465,000
Ending balance: collectively evaluated for impairment 4,984,000   5,412,000
Consumer
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Allowance for credit losses, beginning balance 1,541,000 1,836,000  
Provision charged to operations (238,000) 307,000  
Losses charged to allowance (17,000) (90,000)  
Recoveries 29,000 89,000  
Allowance for credit losses, ending balance 1,315,000 2,142,000  
Ending balance: individually evaluated for impairment 18,000   5,000
Ending balance: collectively evaluated for impairment 1,297,000   1,536,000
Unallocated
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Allowance for credit losses, beginning balance 39,000 139,000  
Provision charged to operations 338,000 150,000  
Losses charged to allowance 0 0  
Recoveries 0 0  
Allowance for credit losses, ending balance 377,000 289,000  
Ending balance: individually evaluated for impairment 0   0
Ending balance: collectively evaluated for impairment $ 377,000   $ 39,000