Quarterly report pursuant to Section 13 or 15(d)

Schedule of Available-for-sale Securities Reconciliation, Non-Agency Unamortized Net Discount and Designated Credit Reserves (Details)

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Schedule of Available-for-sale Securities Reconciliation, Non-Agency Unamortized Net Discount and Designated Credit Reserves (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Available-for-sale Securities, Designated Credit Reserve [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unamortized Discount, Beginning Balance $ (782,606) $ (145,855)
Available-for-sale Securities, Unamortized Discount, Acquisitions (590,090) (640,451)
Available-for-sale Securities, Unamortized Discount, Accretion 493 0
Available-for-sale Securities, Unamortized Discount, Credit Losses 33,622 3,011
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment (9,310) (3,665)
Available-for-sale Securities, Unamortized Discount, Transfers 0 579
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 8,154 13,443
Available-for-sale Securities, Unamortized Discount, Ending Balance (1,339,737) (772,938)
Available-for-sale Securities, Net, Unamortized [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unamortized Discount, Beginning Balance (540,969) (129,992)
Available-for-sale Securities, Unamortized Discount, Acquisitions (534,000) (483,479)
Available-for-sale Securities, Unamortized Discount, Accretion 98,685 32,305
Available-for-sale Securities, Unamortized Discount, Credit Losses 0 0
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment 0 0
Available-for-sale Securities, Unamortized Discount, Transfers 0 (579)
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 15,876 26,416
Available-for-sale Securities, Unamortized Discount, Ending Balance (960,408) (555,329)
Available-for-sale Securities, Unamortized Discount [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unamortized Discount, Beginning Balance (1,323,575) (275,847)
Available-for-sale Securities, Unamortized Discount, Acquisitions (1,124,090) (1,123,930)
Available-for-sale Securities, Unamortized Discount, Accretion 99,178 32,305
Available-for-sale Securities, Unamortized Discount, Credit Losses 33,622 3,011
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment (9,310) (3,665)
Available-for-sale Securities, Unamortized Discount, Transfers 0 0
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 24,030 39,859
Available-for-sale Securities, Unamortized Discount, Ending Balance $ (2,300,145) $ (1,328,267)