Quarterly report pursuant to Section 13 or 15(d)

Fair Values of Assets and Liabilities (Details Textuals)

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Fair Values of Assets and Liabilities (Details Textuals) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage loans held for sale $ 222,900,000   $ 222,900,000  
Fair Values of Assets and Liabilities (Textuals) [Abstract]        
Mortgage loans held for sale, aggregate outstanding principal 214,700,000   214,700,000  
Federal Agencies: mortgage-backed securities transferred to held-to-maturity securities portfolio 469,100,000      
Impaired loans fair value based upon collateral value 83,700,000   83,700,000  
Non recurring fair value impairment recorded within the provision for credit losses     21,200,000  
OREO assets, fair value 38,700,000   38,700,000  
Losses recorded within non interest expense     1,100,000  
Level 2 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains resulting from changes in fair value of loans 11,700,000 19,400,000 44,500,000 34,500,000
Held as loans change in Fair value 1,800,000 8,800,000 7,900,000 11,300,000
Net gains and losses, before tax, from fair value changes reflected in interest expense (1,400,000) (5,900,000) (3,600,000) (2,200,000)
Level 3 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net Gains And Losses Before Tax From Fair Value Changes Reflected In Interest And Fee Income 1,100,000 (3,300,000) (1,400,000) 4,300,000
Net gain associated with instrument specific credit risk 2,100,000 100,000 2,200,000 600,000
Municipal securities [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Transfer in of Level 3 Assets       323,600,000
Asset-backed Securities [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Transfer out of Level 3 Assets       184,100,000
Automobile Loan [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Transfer in of Level 3 Assets       $ 180,000,000