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Derivatives and Hedging Activities (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Interest Rate Lock Commitments      
Derivative financial instruments      
Off-balance Sheet Commitments $ 306,698,000   $ 84,803,000
Interest Rate Cap      
Derivative financial instruments      
Forecasted Notional Amount 130,500,000    
Interest Rate Cap | Other assets      
Derivative financial instruments      
Fair value of derivative $ 799,000    
Interest Rate Cap | Minimum Range      
Derivative financial instruments      
Derivative, Cap Interest Rate 1.50%    
Interest Rate Cap | Maximum Range      
Derivative financial instruments      
Derivative, Cap Interest Rate 2.00%    
Interest Rate Swaps      
Derivative financial instruments      
Forecasted Notional Amount     260,000,000
Loss on Termination of Interest Rate Swaps     9,997,000
Interest expense recorded on interest rate swaps $ 0 $ 1,976,000  
Forward commitments to sell TBA securities      
Derivative financial instruments      
Forecasted Notional Amount $ 264,750,000   $ 82,000,000