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Loans (Narrative) (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 2,497,023,000 $ 2,146,369,000
Residential Real Estate [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Construction loans 16,900,000 15,400,000
Gross loans 1,149,411,000 1,031,435,000
Commercial Real Estate [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Construction loans 26,200,000 15,400,000
Gross loans $ 1,001,453,000 $ 821,970,000