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Allowance for Loan Losses (Allowance for Loan Losses by Segment & Impairment Methodology) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans Individually Evaluated for Impairment $ 18,763 $ 29,033
Related Allowance on Loans Individually Evaluated for Impairment 1,311 1,815
Loans Collectively Evaluated for Impairment 2,195,079 2,118,126
Related Allowance on Loans Collectively Evaluated for Impairment 21,131 19,821
Total loans 2,213,842 [1] 2,147,159 [1]
Allowance for Loan Losses 30,448 29,802
Commercial Mortgages [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans Individually Evaluated for Impairment 3,849 12,099
Related Allowance on Loans Individually Evaluated for Impairment 204 329
Loans Collectively Evaluated for Impairment 660,561 612,714
Related Allowance on Loans Collectively Evaluated for Impairment 8,741 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 17,365 10,955
Related Allowance on Loans Collectively Evaluated for Impairment 164 95
Commercial Other [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans Individually Evaluated for Impairment 10,319 10,334
Related Allowance on Loans Individually Evaluated for Impairment 523 839
Loans Collectively Evaluated for Impairment 499,901 478,526
Related Allowance on Loans Collectively Evaluated for Impairment 5,716 5,361
Residential Segment [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans Individually Evaluated for Impairment 4,228 5,988
Related Allowance on Loans Individually Evaluated for Impairment 582 495
Loans Collectively Evaluated for Impairment 697,791 694,426
Related Allowance on Loans Collectively Evaluated for Impairment 4,131 4,199
Consumer Segment [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans Individually Evaluated for Impairment 367 612
Related Allowance on Loans Individually Evaluated for Impairment 2 152
Loans Collectively Evaluated for Impairment 319,461 321,505
Related Allowance on Loans Collectively Evaluated for Impairment 2,379 2,300
Unallocated [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 0
Allowance for Loan Losses $ 8,006 $ 8,166
[1] Includes net unamortized loan origination costs of $6 thousand and $31 thousand, respectively, and net unamortized premiums on purchased loans of $58 thousand and $67 thousand, respectively, at June 30, 2012 and December 31, 2011.