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Derivative Financial Instruments and Hedging Activities - Summary of Open Derivative Positions and the Gains (Losses) on all Derivatives (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Not Designated as Hedging Instrument [Member]    
Hedge the effect of changes in interest rates on interest expense on borrowings    
Asset / (Liability) at Fair Value [1] $ 7,729  
Gains (Losses) (8,034)  
Interest Rate Cap [Member]    
Hedge the effect of changes in interest rates on interest expense on borrowings    
Notional Amount $ 955,000 $ 2,110,000
Interest Rate Cap [Member] | Other Net [Member] | Not Designated as Hedging Instrument [Member]    
Hedge the effect of changes in interest rates on interest expense on borrowings    
Expiration Date Oct. 2017 - Dec. 2018  
Notional Amount $ 955,000  
Asset / (Liability) at Fair Value [1] 1,836  
Gains (Losses) (1,387)  
Forward Mortgage Backed Securities Trades [Member]    
Hedge the effect of changes in interest rates on interest expense on borrowings    
Notional Amount $ 609,177 632,720
Forward Mortgage Backed Securities Trades [Member] | Gain On Loans Held For Sale Net [Member] | Not Designated as Hedging Instrument [Member]    
Hedge the effect of changes in interest rates on interest expense on borrowings    
Expiration Date Mar. 2017  
Notional Amount $ 609,177  
Asset / (Liability) at Fair Value [1] (614)  
Gains (Losses) (6,592)  
IRLCs [Member]    
Hedge the effect of changes in interest rates on interest expense on borrowings    
Notional Amount $ 360,450 $ 278,317
IRLCs [Member] | Gain On Loans Held For Sale Net [Member] | Not Designated as Hedging Instrument [Member]    
Hedge the effect of changes in interest rates on interest expense on borrowings    
Expiration Date Jan. 2017 - May 2017  
Notional Amount $ 360,450  
Asset / (Liability) at Fair Value [1] 6,507  
Gains (Losses) $ (55)  
[1] Derivatives are reported at fair value in Other assets or in Other liabilities on our consolidated balance sheets.