Quarterly report pursuant to Section 13 or 15(d)

Schedule of Mortgage Loans Held-for-Sale Reconciliation (Details)

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Schedule of Mortgage Loans Held-for-Sale Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans Held-for-sale, Mortgages, Unpaid Principal $ 11,093 $ 5,655    
Mortgage loans held-for-sale, at fair value 11,378 5,782 0 0
Assets Sold under Agreements to Repurchase, Market Value 11,884,236 7,457,095    
Loans Held-for-sale, Mortgages [Member]
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Assets Sold under Agreements to Repurchase, Market Value $ 4,763 $ 5,782