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Loans - Repossessed Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Repossessed and foreclosed assets            
Other real estate owned $ 6,964 $ 8,912 $ 8,371 $ 9,024 $ 11,724 $ 11,916
Real estate - residential            
Repossessed and foreclosed assets            
Mortgage loans in process of foreclosure   $ 1,000 $ 1,300