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Allowance for Credit Losses - Allowance for Credit Losses (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
quarter
Sep. 30, 2012
Sep. 30, 2013
quarter
Sep. 30, 2012
Mar. 31, 2013
Dec. 31, 2012
quarter
Mar. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]              
Lookback period used in reserve analysis 20   20     16  
Financing Receivable, Allowance for Credit Losses [Roll Forward]              
Allowance for credit losses, beginning balance     $ 10,133,000 $ 11,396,000 $ 9,601,000   $ 10,140,000
Provision charged to operations 0 0 0 500,000      
Losses charged to allowance (56,000) (220,000) (792,000) (2,401,000)      
Recoveries 187,000 294,000 391,000 719,000      
Allowance for credit losses, ending balance 9,732,000 10,214,000 9,732,000 10,214,000 9,601,000   10,140,000
Ending balance: individually evaluated for impairment 1,081,000   1,081,000     510,000  
Ending balance: collectively evaluated for impairment 8,651,000   8,651,000     9,623,000  
Commercial
              
Financing Receivable, Allowance for Credit Losses [Roll Forward]              
Allowance for credit losses, beginning balance     2,676,000 2,266,000 2,792,000   2,799,000
Provision charged to operations (52,000) (329,000) 622,000 33,000      
Losses charged to allowance (5,000) (1,000) (706,000) (123,000)      
Recoveries 111,000 209,000 254,000 502,000      
Allowance for credit losses, ending balance 2,846,000 2,678,000 2,846,000 2,678,000 2,792,000   2,799,000
Ending balance: individually evaluated for impairment 632,000   632,000     40,000  
Ending balance: collectively evaluated for impairment 2,214,000   2,214,000     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 5,057,000   5,474,000
Provision charged to operations (331,000) 532,000 (1,151,000) 643,000      
Losses charged to allowance 0 0 0 (1,792,000)      
Recoveries 8,000 0 8,000 0      
Allowance for credit losses, ending balance 4,734,000 6,006,000 4,734,000 6,006,000 5,057,000   5,474,000
Ending balance: individually evaluated for impairment 214,000   214,000     465,000  
Ending balance: collectively evaluated for impairment 4,520,000   4,520,000     5,412,000  
Consumer
              
Financing Receivable, Allowance for Credit Losses [Roll Forward]              
Allowance for credit losses, beginning balance     1,541,000 1,836,000 1,252,000   1,494,000
Provision charged to operations 48,000 151,000 (267,000) (56,000)      
Losses charged to allowance (51,000) (219,000) (86,000) (486,000)      
Recoveries 68,000 85,000 129,000 217,000      
Allowance for credit losses, ending balance 1,317,000 1,511,000 1,317,000 1,511,000 1,252,000   1,494,000
Ending balance: individually evaluated for impairment 235,000   235,000     5,000  
Ending balance: collectively evaluated for impairment 1,082,000   1,082,000     1,536,000  
Unallocated
              
Financing Receivable, Allowance for Credit Losses [Roll Forward]              
Allowance for credit losses, beginning balance     39,000 139,000 500,000   373,000
Provision charged to operations 335,000 (354,000) 796,000 (120,000)      
Losses charged to allowance 0 0 0 0      
Recoveries 0 0 0 0      
Allowance for credit losses, ending balance 835,000 19,000 835,000 19,000 500,000   373,000
Ending balance: individually evaluated for impairment 0   0     0  
Ending balance: collectively evaluated for impairment $ 835,000   $ 835,000     $ 39,000