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)

v3.3.1.900
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
 12 Months Ended
Dec. 31, 2015
Dec. 31, 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 557 (77,506)
Available-for-sale Securities, Unamortized Discount, Accretion 0 0
Available-for-sale Securities, Unamortized Discount, Credit Losses (18,068) (16,528)
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment 1,742 (392)
Available-for-sale Securities, Unamortized Discount, Transfers 154,580 115,894
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other (343,581) (252,320)
Available-for-sale Securities, Unamortized Discount, Ending Balance (409,077) (927,605)
Available-for-sale Securities, Unamortized Discount [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 (5,124) (58,007)
Available-for-sale Securities, Unamortized Discount, Accretion 96,061 127,352
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 (154,580) (115,894)
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other (323,990) (150,740)
Available-for-sale Securities, Unamortized Discount, Ending Balance (707,021) (967,368)
Available-for-sale Securities, Net, Unamortized [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) (135,513)
Available-for-sale Securities, Unamortized Discount, Accretion 96,061 127,352
Available-for-sale Securities, Unamortized Discount, Credit Losses (18,068) (16,528)
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment 1,742 (392)
Available-for-sale Securities, Unamortized Discount, Transfers 0 0
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other (667,571) (403,060)
Available-for-sale Securities, Unamortized Discount, Ending Balance $ (1,116,098) $ (1,894,973)