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Loans Held for Sale (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for sale $ 3,178,597 $ 2,725,286
Government insured pool buyouts [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for sale 1,972,701 1,939,114
Mortgage warehouse [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for sale 1,105,985 761,818
Other [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for sale $ 99,911 $ 24,354