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)

v2.4.0.8
Schedule of Available-for-sale Securities Reconciliation, Non-Agency Unamortized Net Discount and Designated Credit Reserves (Details) (Mortgage-backed Securities, Issued by Private Enterprises [Member], USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Available-for-sale Securities, Designated Credit Reserve [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unamortized Discount, Beginning Balance $ 1,234,448 $ 1,290,946
Available-for-sale Securities, Unamortized Discount, Acquisitions 69,663 181,122
Available-for-sale Securities, Unamortized Discount, Accretion 0 (886)
Available-for-sale Securities, Unamortized Discount, Credit Losses (11,325) (28,684)
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment 212 1,662
Available-for-sale Securities, Unamortized Discount, Transfers 91,086 35,201
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 232,881 36,331
Available-for-sale Securities, Unamortized Discount, Ending Balance (969,031) (1,372,628)
Available-for-sale Securities, Net, Unamortized [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unamortized Discount, Beginning Balance 1,071,559 996,490
Available-for-sale Securities, Unamortized Discount, Acquisitions 57,174 390,269
Available-for-sale Securities, Unamortized Discount, Accretion 96,873 108,829
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 (91,086) (35,201)
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 103,481 151,310
Available-for-sale Securities, Unamortized Discount, Ending Balance (1,019,465) (1,161,821)
Available-for-sale Securities, Unamortized Discount [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unamortized Discount, Beginning Balance (2,306,007) (2,287,436)
Available-for-sale Securities, Unamortized Discount, Acquisitions (126,837) (571,391)
Available-for-sale Securities, Unamortized Discount, Accretion 96,873 109,715
Available-for-sale Securities, Unamortized Discount, Credit Losses 11,325 28,684
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment (212) (1,662)
Available-for-sale Securities, Unamortized Discount, Transfers 0 0
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 336,362 187,641
Available-for-sale Securities, Unamortized Discount, Ending Balance $ (1,988,496) $ (2,534,449)