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Fair Value of Financial Instruments - Fair Value Roll Forward (Details) - Interest Rate Lock Commitments - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 551 $ 389
Included in net income 181 $ 392
Ending balance $ 732