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 9 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Sep. 30, 2010
Level 3 [Member]
Municipal securities [Member]
Sep. 30, 2010
Level 3 [Member]
Automobile Loan [Member]
Sep. 30, 2010
Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Transfer in of Level 3 Assets         $ 323,600,000 $ 180,000,000  
Transfer out of Level 3 Assets             184,000,000
Fair Values of Assets and Liabilities (Textuals) [Abstract]              
Mortgage loans held for sale, aggregate outstanding principal 317,121,000 317,121,000 749,982,000 675,009,000      
Federal Agencies: mortgage-backed securities transferred to held-to-maturity securities portfolio 469,100,000            
Impaired loans fair value based upon collateral value 91,000,000 91,000,000          
Non recurring fair value impairment recorded within the provision for credit losses   25,500,000          
OREO assets, fair value 38,000,000 38,000,000          
Losses recorded within non interest expense   $ 1,800,000