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)

v3.2.0.727
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
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Available-for-sale Securities, Designated Credit Reserve [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unamortized Discount, Beginning Balance $ (927,605) $ (1,234,449)
Available-for-sale Securities, Unamortized Discount, Acquisitions (1,284) (62,752)
Available-for-sale Securities, Unamortized Discount, Accretion 0 0
Available-for-sale Securities, Unamortized Discount, Credit Losses 8,470 6,607
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment 1,619 (212)
Available-for-sale Securities, Unamortized Discount, Transfers 58,716 47,495
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 202,458 80,854
Available-for-sale Securities, Unamortized Discount, Ending Balance (657,626) (1,162,457)
Available-for-sale Securities, Net, Unamortized [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unamortized Discount, Beginning Balance (967,368) (1,071,559)
Available-for-sale Securities, Unamortized Discount, Acquisitions 3,283 (46,581)
Available-for-sale Securities, Unamortized Discount, Accretion 52,759 64,084
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 (58,716) (47,495)
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 156,584 45,251
Available-for-sale Securities, Unamortized Discount, Ending Balance (820,024) (1,056,300)
Available-for-sale Securities, Unamortized Discount [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unamortized Discount, Beginning Balance (1,894,973) (2,306,008)
Available-for-sale Securities, Unamortized Discount, Acquisitions (4,567) (109,333)
Available-for-sale Securities, Unamortized Discount, Accretion 52,759 64,084
Available-for-sale Securities, Unamortized Discount, Credit Losses 8,470 6,607
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment 1,619 (212)
Available-for-sale Securities, Unamortized Discount, Transfers 0 0
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 359,042 126,105
Available-for-sale Securities, Unamortized Discount, Ending Balance $ (1,477,650) $ (2,218,757)