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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value $ 4,998   $ 5,429
Interest Rate Lock Commitments [Member]      
Derivative Notional Balance      
Notional balance at December 31, 2017 96,339    
Additions 630,919    
Amortization 0    
Maturities (514,924)    
Terminations (105,916)    
Notional balance at June 30, 2018 $ 106,418    
Maturity June 2018 - July 2018    
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value [1] $ 3,315   3,283
Gains (losses) on derivatives during the six months ended:      
Gains (losses) on derivatives 111 $ (1,428)  
Forward MBS Trades [Member]      
Derivative Notional Balance      
Notional balance at December 31, 2017 240,823    
Additions 295,512    
Amortization 0    
Maturities (337,902)    
Terminations 0    
Notional balance at June 30, 2018 $ 198,433    
Maturity Sept. 2018    
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value [1] $ (2,422)   (545)
Gains (losses) on derivatives during the six months ended:      
Gains (losses) on derivatives 1,998 (6,184)  
Interest Rate Caps [Member]      
Derivative Notional Balance      
Notional balance at December 31, 2017 375,000    
Additions 140,000    
Amortization (140,000)    
Maturities 0    
Terminations 0    
Notional balance at June 30, 2018 $ 375,000    
Maturity July 2018 - May 2020    
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value [1] $ 1,657   $ 2,056
Gains (losses) on derivatives during the six months ended:      
Gains (losses) on derivatives $ (78) $ 31  
[1] Derivatives are reported at fair value in Other assets or in Other liabilities on our unaudited consolidated balance sheets.