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Commitments and Contingencies - Mortgage Banking Derivatives (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Interest Rate Lock Commitments [Member]    
Derivative [Line Items]    
Notional amount $ 874 $ 4,800
Short [Member] | Forward Contracts [Member]    
Derivative [Line Items]    
Notional amount $ 874 $ 4,800