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Fair Value (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Impaired Financing Receivable, Carrying Value $ 105,900,000   $ 112,300,000  
Discount percentage applied to real estate appraised values 15.00%      
Discount percentage applied to lot development appraised values 6.00%      
Partial Charge-Offs On Impaired Loans 54,400,000   63,300,000  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 11,322,000   10,451,000  
Impaired Financing Receivable, Related Allowance 11,322,000   10,451,000  
Impaired loans carried at fair value 32,662,000   33,800,000  
Partial Charge-Offs On Impaired Loans carried at Fair Value 40,100,000   49,000,000  
Book value of impaired loans carried at fair value 40,900,000   41,000,000  
Remaining amount of impaired loans carried at cost 65,000,000   71,300,000  
Impaired Financing Receivable, carried at fair value, related expense 2,200,000 2,300,000    
MSR recorded at lower of cost or fair value 8,778,000 8,121,000 9,013,000 7,763,000
Mortgage Servicing Rights Fair Value 2,100,000   2,300,000  
Valuation allowance of MSR 1,031,000 2,262,000 1,031,000 2,324,000
MSRs recorded at cost 6,700,000   6,700,000  
Changes due to fair value adjustments 0 62,000    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 35,112,000   34,636,000  
Percent of OREO held at fair value 50.40% 53.50%    
Other Real Estate, Foreclosed Assets, and Repossessed Assets, Fair Value 17,700,000   18,526,000  
OREO valuation adjustments (416,000) 401,000    
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Impaired Financing Receivable, Related Allowance 8,259,000   7,200,000  
Financing Receivable, not collateral dependent [Domain]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Impaired Financing Receivable, Related Allowance $ 3,043,000   $ 3,300,000