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, 2011
Dec. 31, 2010
Available-for-sale Securities, Designated Credit Reserve [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unamortized Discount, Beginning Balance $ (145,855) $ (50,187)
Available-for-sale Securities, Unamortized Discount, Acquisitions (651,726) (142,041)
Available-for-sale Securities, Unamortized Discount, Accretion 0 0
Available-for-sale Securities, Unamortized Discount, Credit Losses 6,055 1,736
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment (5,102) 0
Available-for-sale Securities, Unamortized Discount, Transfers 579 4,850
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 13,443 39,787
Available-for-sale Securities, Unamortized Discount, Ending Balance (782,606) (145,855)
Available-for-sale Securities, Net, Unamortized [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unamortized Discount, Beginning Balance (129,992) (41,050)
Available-for-sale Securities, Unamortized Discount, Acquisitions (491,290) (117,908)
Available-for-sale Securities, Unamortized Discount, Accretion 54,466 10,850
Available-for-sale Securities, Unamortized Discount, Credit Losses 0 8
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment 0 0
Available-for-sale Securities, Unamortized Discount, Transfers (579) (4,850)
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 26,426 22,958
Available-for-sale Securities, Unamortized Discount, Ending Balance (540,969) (129,992)
Available-for-sale Securities, Unamortized Discount [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unamortized Discount, Beginning Balance (275,847) (91,237)
Available-for-sale Securities, Unamortized Discount, Acquisitions (1,143,016) (259,949)
Available-for-sale Securities, Unamortized Discount, Accretion 54,466 10,850
Available-for-sale Securities, Unamortized Discount, Credit Losses 6,055 1,744
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment (5,102) 0
Available-for-sale Securities, Unamortized Discount, Transfers 0 0
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 39,869 62,745
Available-for-sale Securities, Unamortized Discount, Ending Balance $ (1,323,575) $ (275,847)