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Loans, Allowance for Loan Losses and Credit Quality (Details 10) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Impaired loans by loan portfolio    
Related Allowance $ 2,755 $ 2,682
Impaired Financing Receivable, Recorded Investment, Total 69,590 61,701
Impaired Financing Receivable, Unpaid Principal Balance 73,358 65,432
WITH NO RELATED ALLOWANCE RECORDED: [Member]
   
Impaired loans by loan portfolio    
Recorded Investment 33,521 24,840
Unpaid Principal Balance 35,393 26,465
Related Allowance      
WITH AN ALLOWANCE RECORDED: [Member]
   
Impaired loans by loan portfolio    
Recorded Investment 36,069 36,861
Unpaid Principal Balance 37,965 38,967
Related Allowance 2,755 2,682
Commercial and Industrial [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
   
Impaired loans by loan portfolio    
Recorded Investment 7,434 3,380
Unpaid Principal Balance 8,427 4,365
Related Allowance      
Commercial and Industrial [Member] | WITH AN ALLOWANCE RECORDED: [Member]
   
Impaired loans by loan portfolio    
Recorded Investment 1,017 2,228
Unpaid Principal Balance 1,517 2,280
Related Allowance 281 562
Commercial Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
   
Impaired loans by loan portfolio    
Recorded Investment 18,387 19,433
Unpaid Principal Balance 19,054 20,010
Related Allowance      
Commercial Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member]
   
Impaired loans by loan portfolio    
Recorded Investment 17,266 18,043
Unpaid Principal Balance 17,645 19,344
Related Allowance 737 457
Commercial Construction [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
   
Impaired loans by loan portfolio    
Recorded Investment    843
Unpaid Principal Balance    843
Related Allowance      
Commercial Construction [Member] | WITH AN ALLOWANCE RECORDED: [Member]
   
Impaired loans by loan portfolio    
Recorded Investment      
Unpaid Principal Balance      
Related Allowance      
Small Business [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
   
Impaired loans by loan portfolio    
Recorded Investment 1,439 1,131
Unpaid Principal Balance 1,506 1,193
Related Allowance      
Small Business [Member] | WITH AN ALLOWANCE RECORDED: [Member]
   
Impaired loans by loan portfolio    
Recorded Investment 1,197 1,195
Unpaid Principal Balance 1,229 1,218
Related Allowance 201 148
Residential Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
   
Impaired loans by loan portfolio    
Recorded Investment 2,702   
Unpaid Principal Balance 2,755   
Related Allowance      
Residential Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member]
   
Impaired loans by loan portfolio    
Recorded Investment 13,571 12,984
Unpaid Principal Balance 14,480 13,651
Related Allowance 1,326 1,245
Consumer - Home Equity [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
   
Impaired loans by loan portfolio    
Recorded Investment 3,485 22
Unpaid Principal Balance 3,576 22
Related Allowance      
Consumer - Home Equity [Member] | WITH AN ALLOWANCE RECORDED: [Member]
   
Impaired loans by loan portfolio    
Recorded Investment 799 304
Unpaid Principal Balance 874 349
Related Allowance 36 31
Consumer - Other [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
   
Impaired loans by loan portfolio    
Recorded Investment 74 31
Unpaid Principal Balance 75 32
Related Allowance      
Consumer - Other [Member] | WITH AN ALLOWANCE RECORDED: [Member]
   
Impaired loans by loan portfolio    
Recorded Investment 2,219 2,107
Unpaid Principal Balance 2,220 2,125
Related Allowance $ 174 $ 239