Quarterly report pursuant to Section 13 or 15(d)

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

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Stockholders' Equity Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 631,032 $ 855,789
Collateralized Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unrealized Gains 711,813 891,820
Available-for-sale Securities, Gross Unrealized Losses $ (80,781) $ (36,031)