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)

v2.4.0.6
Schedule of Available-for-sale Securities Reconciliation, Non-Agency Unamortized Net Discount and Designated Credit Reserves (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 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 (101,733) (521,424)
Available-for-sale Securities, Unamortized Discount, Accretion 655 0
Available-for-sale Securities, Unamortized Discount, Credit Losses 10,901 3,309
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment (236) (4,275)
Available-for-sale Securities, Unamortized Discount, Transfers 1,691 0
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 2,975 243
Available-for-sale Securities, Unamortized Discount, Ending Balance (1,376,693) (1,304,753)
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 (41,450) (437,331)
Available-for-sale Securities, Unamortized Discount, Accretion 34,636 28,897
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 (1,691) 0
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 31,755 1,030
Available-for-sale Securities, Unamortized Discount, Ending Balance (973,240) (948,373)
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 (143,183) (958,755)
Available-for-sale Securities, Unamortized Discount, Accretion 35,291 28,897
Available-for-sale Securities, Unamortized Discount, Credit Losses 10,901 3,309
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment (236) (4,275)
Available-for-sale Securities, Unamortized Discount, Transfers 0 0
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 34,730 1,273
Available-for-sale Securities, Unamortized Discount, Ending Balance $ (2,349,933) $ (2,253,126)