v3.5.0.2
Securities - Schedule of Securities in a Continuous Unrealized Loss Position Aggregated by Investment Category and Length of Time (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value $ 78,294 $ 426,537
Less than 12 months, Unrealized Loss (1,205) (3,601)
Total, Fair Value 78,294 426,537
Total, Unrealized Loss (1,205) (3,601)
Agency and FHLB Agency notes    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 46,649  
Less than 12 months, Unrealized Loss (96)  
Total, Fair Value 46,649  
Total, Unrealized Loss (96)  
Beneficial interests in FHLMC securitization    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 31,645 12,674
Less than 12 months, Unrealized Loss (1,109) (476)
Total, Fair Value 31,645 12,674
Total, Unrealized Loss $ (1,109) (476)
Agency Notes    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value   16,013
Less than 12 months, Unrealized Loss   (95)
Total, Fair Value   16,013
Total, Unrealized Loss   (95)
Agency Mortgage-backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value   397,850
Less than 12 months, Unrealized Loss   (3,030)
Total, Fair Value   397,850
Total, Unrealized Loss   $ (3,030)