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Loans - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Residential Consumer Properties    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residential loans in process of foreclosure $ 4,400 $ 1,200
Consumer Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other real estate properties owned   $ 166