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Derivatives and Hedging Activities (Details Textual) - USD ($)
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Interest Rate Lock Commitments      
Derivative financial instruments      
Off-balance Sheet Commitments $ 142,700,000   $ 59,974,000
Interest Rate Swap One      
Derivative financial instruments      
Forecasted Notional Amount 160,000,000    
Interest Rate Swap Two      
Derivative financial instruments      
Forecasted Notional Amount 100,000,000    
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 5,532,000 $ 5,993,000  
Forward commitments to sell TBA securities      
Derivative financial instruments      
Forecasted Notional Amount $ 142,500,000   $ 40,750,000