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Allowance for Loan Losses (Allowance for Loan Losses by Segment & Impairment Methodology) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans Individually Evaluated for Impairment $ 29,991 $ 29,033
Related Allowance on Loans Individually Evaluated for Impairment 2,023 1,815
Loans Collectively Evaluated for Impairment 2,226,706 2,118,126
Related Allowance on Loans Collectively Evaluated for Impairment 20,857 19,821
Total loans 2,256,697 [1] 2,147,159 [1]
Allowance for Loan Losses 30,752 29,802
Commercial Mortgages [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans Individually Evaluated for Impairment 15,087 12,099
Related Allowance on Loans Individually Evaluated for Impairment 939 329
Loans Collectively Evaluated for Impairment 678,134 612,714
Related Allowance on Loans Collectively Evaluated for Impairment 8,314 7,866
Commercial Construction and Development [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans Individually Evaluated for Impairment 0 0
Related Allowance on Loans Individually Evaluated for Impairment 0 0
Loans Collectively Evaluated for Impairment 25,132 10,955
Related Allowance on Loans Collectively Evaluated for Impairment 218 95
Commercial Other [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans Individually Evaluated for Impairment 10,082 10,334
Related Allowance on Loans Individually Evaluated for Impairment 571 839
Loans Collectively Evaluated for Impairment 490,892 478,526
Related Allowance on Loans Collectively Evaluated for Impairment 5,935 5,361
Residential Segment [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans Individually Evaluated for Impairment 4,350 5,988
Related Allowance on Loans Individually Evaluated for Impairment 510 495
Loans Collectively Evaluated for Impairment 711,062 694,426
Related Allowance on Loans Collectively Evaluated for Impairment 3,754 4,199
Consumer Segment [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans Individually Evaluated for Impairment 472 612
Related Allowance on Loans Individually Evaluated for Impairment 3 152
Loans Collectively Evaluated for Impairment 321,486 321,505
Related Allowance on Loans Collectively Evaluated for Impairment 2,636 2,300
Unallocated [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 0
Allowance for Loan Losses $ 7,872 $ 8,166
[1] Includes net unamortized loan origination costs of $39 thousand and $31 thousand, respectively, and net unamortized premiums on purchased loans of $76 thousand and $67 thousand, respectively, at September 30, 2012 and December 31, 2011.