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Loans (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]      
Troubled Debt Restructuring, Classification removed $ 966,000    
Partial Charge-Offs On Impaired Loans 54,400,000   63,300,000
Impaired Financing Receivable, Related Allowance 11,322,000   10,451,000
Recorded investment, related to loans 24,100,000   21,400,000
TDRs included in nonaccrual loan totals 70,700,000   76,300,000
TDRs included in accruing loan totals 18,000,000   18,800,000
Nonaccrual TDRs considered current 27,600,000   50,600,000
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR 2,700,000   4,000,000
Specific reserves related to troubled debt restructuring 8,200,000   7,500,000
Additional specific reserves related to troubled debt restructurings 18,000 238,000  
Modified substandard commercial loans, total recorded investment 392,000 800,000  
Modified substandard consumer loans, total recorded investment 5,700,000 6,600,000  
Loan Modifications on Nonacrrual status 900,000 300,000  
Loan past due period before entering default status 30 days    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period 2,860,000 7,079,000  
Financing Receivable With No Related Allowance Recorded [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Partial Charge-Offs On Impaired Loans 49,200,000   58,100,000
Financing Receivable With A Related Allowance Recorded [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Partial Charge-Offs On Impaired Loans 5,100,000   5,200,000
Commercial Real Estate [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period 872,000 198,000  
Commercial Real Estate [Member] | Financing Receivable With No Related Allowance Recorded [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Related Allowance 0   0
Commercial Real Estate [Member] | Financing Receivable With A Related Allowance Recorded [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Related Allowance 5,514,000   5,496,000
Accruing [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans modified during period 499,000 768,000  
Nonaccrual [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans modified during period $ 2,400,000 $ 6,300,000