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Derivative Financial Instruments - Summary of Derivative Notional Amounts and Fair Values (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Interest rate lock commitments    
Derivative [Line Items]    
Notional amount, derivative asset $ 16,710 $ 874
Fair value, derivative asset 142 10
Notional amount, derivative liability 6,805 0
Fair value, derivative liability 38 0
Forward sale contracts related to mortgage banking | Short    
Derivative [Line Items]    
Notional amount, derivative asset 8,397 0
Fair value, derivative asset 23 0
Notional amount, derivative liability 15,118 874
Fair value, derivative liability $ 58 $ 3