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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value $ 5,861   $ 4,552
Interest Rate Lock Commitments [Member]      
Derivative Notional Balance      
Notional balance at September 30, 2019 173,616    
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value 4,781   3,871
Gains (losses) on derivatives during the nine months ended:      
Gains (losses) on derivatives 401 $ 137  
TBA/Forward Mortgage Backed Securities Trades [Member]      
Derivative Notional Balance      
Notional balance at September 30, 2019 700,000    
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value 887   0
Gains (losses) on derivatives during the nine months ended:      
Gains (losses) on derivatives 322 0  
Forward MBS Trades [Member]      
Derivative Notional Balance      
Notional balance at September 30, 2019 9,763    
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value (3,126)   (4,983)
Gains (losses) on derivatives during the nine months ended:      
Gains (losses) on derivatives (3,344) 2,082  
Interest Rate Caps [Member]      
Derivative Notional Balance      
Notional balance at September 30, 2019 57,083    
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value 0   $ 678
Gains (losses) on derivatives during the nine months ended:      
Gains (losses) on derivatives $ (358) $ (308)