Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2012
Dec. 31, 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 (634,890) (651,726)
Available-for-sale Securities, Unamortized Discount, Accretion 493 0
Available-for-sale Securities, Unamortized Discount, Credit Losses 47,344 6,055
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment (10,952) (5,102)
Available-for-sale Securities, Unamortized Discount, Transfers 65,401 579
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 24,264 13,443
Available-for-sale Securities, Unamortized Discount, Ending Balance (1,290,946) (782,606)
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 (553,868) (491,290)
Available-for-sale Securities, Unamortized Discount, Accretion 135,988 54,466
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 (65,401) (579)
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 27,760 26,426
Available-for-sale Securities, Unamortized Discount, Ending Balance (996,490) (540,969)
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 (1,188,758) (1,143,016)
Available-for-sale Securities, Unamortized Discount, Accretion 136,481 54,466
Available-for-sale Securities, Unamortized Discount, Credit Losses 47,344 6,055
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment (10,952) (5,102)
Available-for-sale Securities, Unamortized Discount, Transfers 0 0
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 52,024 39,869
Available-for-sale Securities, Unamortized Discount, Ending Balance $ (2,287,436) $ (1,323,575)