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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value $ 4,341   $ 4,552
Interest Rate Lock Commitments [Member]      
Derivative Notional Balance      
Notional balance at March 31, 2019 117,770    
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value [1] 3,982   3,871
Gains (losses) on derivatives during the three months ended:      
Gains (losses) on derivatives (341) $ 1,377  
Forward MBS Trades [Member]      
Derivative Notional Balance      
Notional balance at March 31, 2019 105,500    
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value [1] (4,126)   (4,983)
Gains (losses) on derivatives during the three months ended:      
Gains (losses) on derivatives (2,270) 2,398  
Interest Rate Caps [Member]      
Derivative Notional Balance      
Notional balance at March 31, 2019 193,750    
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value [1] 276   $ 678
Gains (losses) on derivatives during the three months ended:      
Gains (losses) on derivatives $ (402) $ 193  
[1] Derivatives are reported at fair value in Other assets or in Other liabilities on our unaudited consolidated balance sheets.