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Interest Rate Lock and Forward Loan Sale Commitments - Location of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Assets and liabilities related to derivatives    
Fair value of asset derivatives $ 5 $ 5
Fair value of liability derivatives 5 5
Interest rate contracts | Prepaid expenses and other assets    
Assets and liabilities related to derivatives    
Fair value of asset derivatives 5 5
Interest rate contracts | Accounts payable and accrued expenses    
Assets and liabilities related to derivatives    
Fair value of liability derivatives $ 5 $ 5