Loans And Related Allowances For Loan Loasses (Narrative)(Details) (USD $)
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Financing Receivable, Modifications [Line Items]            
Nonaccrual Loans Subject To Partial Charge Off $ 27,017,000   $ 38,188,000      
Impaired Financing Receivable, Related Allowance 1,616,000   3,951,000      
Loans and Leases Receivable, Allowance 16,770,000 17,213,000 19,480,000 21,001,000 21,409,000 22,138,000
Partial Charge Off [Member]
           
Financing Receivable, Modifications [Line Items]            
Nonaccrual Loans Subject To Partial Charge Off 11,500,000   13,400,000      
Troubled Debt Restructuring [Member]
           
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modifications, Number of Contracts 4          
Impaired Financing Receivable, Related Allowance 0          
Loans and Leases Receivable, Allowance 6,796          
Residential Mortgage [Member]
           
Financing Receivable, Modifications [Line Items]            
Loans and Leases Receivable, Allowance $ 3,457,000 $ 3,377,000 $ 3,430,000 $ 3,714,000 $ 3,851,000 $ 4,211,000
Residential Mortgage [Member] | Troubled Debt Restructuring [Member]
           
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modifications, Number of Contracts 2