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Allowance for Loan Losses (Allowance for Loan Losses by Segment & Impairment Methodology) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans Individually Evaluated for Impairment $ 39,260 $ 35,547
Related Allowance on Loans Individually Evaluated for Impairment 5,026 2,880
Loans Collectively Evaluated for Impairment 2,285,785 2,258,456
Related Allowance on Loans Collectively Evaluated for Impairment 17,815 19,700
Total loans 2,325,045 [1] 2,294,003 [1]
Allowance for Loan Losses 31,139 30,873
Commercial Mortgages [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans Individually Evaluated for Impairment 24,553 20,250
Related Allowance on Loans Individually Evaluated for Impairment 3,609 1,720
Loans Collectively Evaluated for Impairment 705,415 690,563
Related Allowance on Loans Collectively Evaluated for Impairment 5,998 7,687
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 34,179 27,842
Related Allowance on Loans Collectively Evaluated for Impairment 246 224
Commercial Other [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans Individually Evaluated for Impairment 9,676 10,989
Related Allowance on Loans Individually Evaluated for Impairment 683 694
Loans Collectively Evaluated for Impairment 503,324 502,775
Related Allowance on Loans Collectively Evaluated for Impairment 5,283 5,302
Residential Segment [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans Individually Evaluated for Impairment 4,632 3,868
Related Allowance on Loans Individually Evaluated for Impairment 701 463
Loans Collectively Evaluated for Impairment 719,729 713,813
Related Allowance on Loans Collectively Evaluated for Impairment 3,832 3,806
Consumer Segment [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans Individually Evaluated for Impairment 399 440
Related Allowance on Loans Individually Evaluated for Impairment 33 3
Loans Collectively Evaluated for Impairment 323,138 323,463
Related Allowance on Loans Collectively Evaluated for Impairment 2,456 2,681
Unallocated [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 0
Allowance for Loan Losses $ 8,298 $ 8,293
[1] Includes net unamortized loan origination costs of $56 thousand and $39 thousand, respectively, and net unamortized premiums on purchased loans of $42 thousand and $83 thousand, respectively, at March 31, 2013 and December 31, 2012.