Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Stockholders' Equity Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 199,227 $ 359,061
Collateralized Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unrealized Gains 393,555 405,177
Available-for-sale Securities, Gross Unrealized Losses $ (194,328) $ (46,116)