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Short-Term Borrowings and Long-Term Debt Long Term (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument [Line Items]    
Federal Home Loan Bank advances and long-term debt $ 1,040,149,000 $ 1,119,450,000
Federal Home Loan Bank Advances [Member]
   
Debt Instrument [Line Items]    
Federal Home Loan Bank advances and long-term debt 666,565,000 736,043,000
Debt, Weighted Average Interest Rate 4.14%  
Debt Instrument, Unused Borrowing Capacity, Amount 970,000,000  
Debt Instrument, Maturity Date Dec. 31, 2027  
Subordinated Debt [Member]
   
Debt Instrument [Line Items]    
Federal Home Loan Bank advances and long-term debt 200,000,000 200,000,000
Junior Subordinated Debt [Member]
   
Debt Instrument [Line Items]    
Federal Home Loan Bank advances and long-term debt 175,260,000 185,570,000
Other Debt Obligations [Member]
   
Debt Instrument [Line Items]    
Federal Home Loan Bank advances and long-term debt 1,585,000 1,430,000
Unamortized Issue Costs [Member]
   
Debt Instrument [Line Items]    
Federal Home Loan Bank advances and long-term debt $ (3,261,000) $ (3,593,000)
Line of Credit [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 1.50%