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
 6 Months Ended
Jun. 30, 2013
Jun. 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 (158,955) (553,552)
Available-for-sale Securities, Unamortized Discount, Accretion 886 250
Available-for-sale Securities, Unamortized Discount, Credit Losses 22,658 17,908
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment (1,662) (8,751)
Available-for-sale Securities, Unamortized Discount, Transfers 30,883 0
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 10,529 4,653
Available-for-sale Securities, Unamortized Discount, Ending Balance (1,386,607) (1,322,098)
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 (365,348) (479,435)
Available-for-sale Securities, Unamortized Discount, Accretion 71,625 62,768
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 (30,883) 0
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 98,478 13,338
Available-for-sale Securities, Unamortized Discount, Ending Balance (1,222,618) (944,298)
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 (524,303) (1,032,987)
Available-for-sale Securities, Unamortized Discount, Accretion 72,511 63,018
Available-for-sale Securities, Unamortized Discount, Credit Losses 22,658 17,908
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment (1,662) (8,751)
Available-for-sale Securities, Unamortized Discount, Transfers 0 0
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 109,007 17,991
Available-for-sale Securities, Unamortized Discount, Ending Balance $ (2,609,225) $ (2,266,396)