Quarterly report pursuant to Section 13 or 15(d)

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

v3.4.0.3
Stockholders' Equity Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unrealized Gains $ 410,764  
Available-for-sale Securities, Gross Unrealized Losses (30,358)  
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 380,406 $ 359,061
Collateralized Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unrealized Gains   405,177
Available-for-sale Securities, Gross Unrealized Losses   $ (46,116)