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, 2013
Sep. 30, 2012
Available-for-sale Securities, Designated Credit Reserve [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unamortized Discount, Beginning Balance $ (1,290,946) $ (782,606)
Available-for-sale Securities, Unamortized Discount, Acquisitions (181,122) (590,090)
Available-for-sale Securities, Unamortized Discount, Accretion 886 493
Available-for-sale Securities, Unamortized Discount, Credit Losses 28,684 33,622
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment (1,662) (9,310)
Available-for-sale Securities, Unamortized Discount, Transfers 35,201 0
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 36,331 8,154
Available-for-sale Securities, Unamortized Discount, Ending Balance (1,372,628) (1,339,737)
Available-for-sale Securities, Net, Unamortized [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unamortized Discount, Beginning Balance (996,490) (540,969)
Available-for-sale Securities, Unamortized Discount, Acquisitions (390,269) (534,000)
Available-for-sale Securities, Unamortized Discount, Accretion 108,829 98,685
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 (35,201) 0
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 151,310 15,876
Available-for-sale Securities, Unamortized Discount, Ending Balance (1,161,821) (960,408)
Available-for-sale Securities, Unamortized Discount [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unamortized Discount, Beginning Balance (2,287,436) (1,323,575)
Available-for-sale Securities, Unamortized Discount, Acquisitions (571,391) (1,124,090)
Available-for-sale Securities, Unamortized Discount, Accretion 109,715 99,178
Available-for-sale Securities, Unamortized Discount, Credit Losses 28,684 33,622
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment (1,662) (9,310)
Available-for-sale Securities, Unamortized Discount, Transfers 0 0
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 187,641 24,030
Available-for-sale Securities, Unamortized Discount, Ending Balance $ (2,534,449) $ (2,300,145)