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)

v3.6.0.2
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, 2016
Dec. 31, 2015
Available-for-sale Securities, Designated Credit Reserve [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unamortized Discount, Beginning Balance $ (409,077) $ (927,605)
Available-for-sale Securities, Unamortized Discount, Acquisitions (70,108) 557
Available-for-sale Securities, Unamortized Discount, Accretion 0 0
Available-for-sale Securities, Unamortized Discount, Credit Losses 1,969 18,068
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment 914 1,742
Available-for-sale Securities, Unamortized Discount, Transfers 74,972 154,580
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 33,893 343,581
Available-for-sale Securities, Unamortized Discount, Ending Balance (367,437) (409,077)
Available-for-sale Securities, Net, Unamortized [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unamortized Discount, Beginning Balance (707,021) (967,368)
Available-for-sale Securities, Unamortized Discount, Acquisitions (189,754) (5,124)
Available-for-sale Securities, Unamortized Discount, Accretion 69,542 96,061
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 (74,972) (154,580)
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 93,230 323,990
Available-for-sale Securities, Unamortized Discount, Ending Balance (808,975) (707,021)
Available-for-sale Securities, Unamortized Discount [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unamortized Discount, Beginning Balance (1,116,098) (1,894,973)
Available-for-sale Securities, Unamortized Discount, Acquisitions (259,862) (4,567)
Available-for-sale Securities, Unamortized Discount, Accretion 69,542 96,061
Available-for-sale Securities, Unamortized Discount, Credit Losses 1,969 18,068
Available-for-sale Securities, Unamortized Discount, Other-than-temporary Impairment Adjustment 914 1,742
Available-for-sale Securities, Unamortized Discount, Transfers 0 0
Available-for-sale Securities, Unamortized Discount, Sales, Calls and Other 127,123 667,571
Available-for-sale Securities, Unamortized Discount, Ending Balance $ (1,176,412) $ (1,116,098)