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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value $ 4,721   $ 5,429
Interest Rate Lock Commitments [Member]      
Derivative Notional Balance      
Notional balance at December 31, 2017 96,339    
Additions 927,700    
Amortization 0    
Maturities (746,615)    
Terminations (164,978)    
Notional balance at September 30, 2018 $ 112,446    
Maturity Oct. 2018 - Nov. 2018    
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value [1] $ 2,816   3,283
Gains (losses) on derivatives during the nine months ended:      
Gains (losses) on derivatives 137 $ (1,605)  
Forward MBS Trades [Member]      
Derivative Notional Balance      
Notional balance at December 31, 2017 240,823    
Additions 386,311    
Amortization 0    
Maturities (407,759)    
Terminations 0    
Notional balance at September 30, 2018 $ 219,375    
Maturity Dec. 2018    
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value [1] $ (1,873)   (545)
Gains (losses) on derivatives during the nine months ended:      
Gains (losses) on derivatives 2,082 (8,604)  
Interest Rate Caps [Member]      
Derivative Notional Balance      
Notional balance at December 31, 2017 375,000    
Additions 154,583    
Amortization (208,750)    
Maturities 0    
Terminations 0    
Notional balance at September 30, 2018 $ 320,833    
Maturity May 2019 - May 2020    
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value [1] $ 1,211   $ 2,056
Gains (losses) on derivatives during the nine months ended:      
Gains (losses) on derivatives $ (308) $ (207)  
[1] Derivatives are reported at fair value in Other assets or in Other liabilities on our unaudited consolidated balance sheets.