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Reverse Repurchase Agreements Contractual Maturities of Reverse Repurchase Agreements (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Total $ 1,100,000 $ 1,100,000
Secured Debt    
Debt Instrument [Line Items]    
2018 200,000  
2019 600,000  
2020 300,000  
Total 1,100,000  
Callable 2015 100,000  
Callable 2016 100,000  
Callable 2017 $ 100,000  
Residential mortgage-backed securities | Secured Debt    
Debt Instrument [Line Items]    
Composition of collateral that can be resold or repledged, as percentage 83.00%  
Obligations of GSEs | Secured Debt    
Debt Instrument [Line Items]    
Composition of collateral that can be resold or repledged, as percentage 17.00%