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
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans Held-for-sale, Mortgages, Unpaid Principal $ 228,840 $ 56,976    
Loans Held-for-sale, Mortgages, Fair Value Adjustment (36,423) 1,631    
Mortgage loans held-for-sale, at fair value 192,417 58,607 5,711 5,782
Assets Sold under Agreements to Repurchase, Market Value 15,096,848 14,287,224    
Loans Held-for-sale, Mortgages [Member]
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Assets Sold under Agreements to Repurchase, Market Value $ 25,909 $ 52,529