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)

v3.8.0.1
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
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Available-for-sale Securities, Designated Credit Reserve [Member]    
Available-for-sale Securities, Unamortized Discount [Roll Forward]    
Unamortized discount on available-for-sale securities, beginning balance $ (367,437) $ (409,077)
Acquisitions (217,206) (45,398)
Accretion of net discount 0 0
Realized credit losses 11,385 279
Reclassification adjustment for other-than-temporary impairments (429) (1,226)
Transfers from (to) 44,412 70,371
Sales, calls, other 3,588 32,562
Unamortized discount on available-for-sale securities, ending balance (525,687) (352,489)
Available-for-sale Securities, Net, Unamortized [Member]    
Available-for-sale Securities, Unamortized Discount [Roll Forward]    
Unamortized discount on available-for-sale securities, beginning balance (808,975) (707,021)
Acquisitions (111,938) (140,318)
Accretion of net discount 67,219 50,596
Realized credit losses 0 0
Reclassification adjustment for other-than-temporary impairments 0 0
Transfers from (to) (44,412) (70,371)
Sales, calls, other 81,846 77,689
Unamortized discount on available-for-sale securities, ending balance (816,260) (789,425)
Available-for-sale Securities, Unamortized Discount [Member]    
Available-for-sale Securities, Unamortized Discount [Roll Forward]    
Unamortized discount on available-for-sale securities, beginning balance (1,176,412) (1,116,098)
Acquisitions (329,144) (185,716)
Accretion of net discount 67,219 50,596
Realized credit losses 11,385 279
Reclassification adjustment for other-than-temporary impairments (429) (1,226)
Transfers from (to) 0 0
Sales, calls, other 85,434 110,251
Unamortized discount on available-for-sale securities, ending balance $ (1,341,947) $ (1,141,914)