Quarterly report pursuant to Section 13 or 15(d)

Equity Schedule of Accumulated Other Comprehensive Income (Loss) (Details)

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Equity Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Accumulated other comprehensive income $ 423,042 $ 199,227
Collateralized Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized gains 508,607 393,555
Unrealized losses $ (85,565) $ (194,328)