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Fair Value Part 3 (Details) (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities held to maturity $ 45,484,000   $ 57,705,000  
Net LHFI 5,444,437,000   5,767,966,000  
Net acquired loans 143,270,000   76,302,000  
FDIC indemnification assets 23,979,000   28,348,000 0
Deposits 7,804,041,000   7,566,363,000  
Subordinated notes 49,863,000   49,839,000  
Junior subordinated debt securities 61,856,000   61,856,000  
Nonfinancial Assets and Liabilities [Abstract]        
Foreclosed assets measured at fair value 32,400,000 49,000,000    
Allowance for possible loan losses, Charge-offs 8,500,000 6,000,000    
Foreclosed assets re-measured after initial recognition 29,700,000 56,800,000    
Write-downs Of Allowance For Foreclosed Assets After Initial Recognition 4,800,000 10,800,000    
Outstanding balances in impaired loans 36,500,000   68,900,000  
Fair Value, Inputs, Level 2 [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and short-term investments 214,483,000   211,883,000  
Securities held to maturity 45,484,000   57,705,000  
Deposits 7,804,041,000   7,566,363,000  
Short-term liabilities 492,323,000   692,128,000  
Subordinated notes 49,863,000   49,839,000  
Junior subordinated debt securities 61,856,000   61,856,000  
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and short-term investments 214,483,000   211,883,000  
Securities held to maturity 50,272,000   62,515,000  
Deposits 7,812,355,000   7,575,064,000  
Short-term liabilities 492,323,000   692,128,000  
Subordinated notes 53,457,000   51,438,000  
Junior subordinated debt securities 38,969,000   35,876,000  
Fair Value, Inputs, Level 3 [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net LHFI 5,444,437,000   5,767,966,000  
Net acquired loans 143,270,000   76,302,000  
FDIC indemnification assets 23,979,000   28,348,000  
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net LHFI 5,528,840,000   5,848,791,000  
Net acquired loans 143,270,000   76,302,000  
FDIC indemnification assets $ 23,979,000   $ 28,348,000