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Loans - Repossessed Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Repossessed and foreclosed assets            
Other real estate owned $ 8,912 $ 7,063 $ 8,371 $ 11,724 $ 13,481 $ 11,916
Real estate - residential            
Repossessed and foreclosed assets            
Mortgage loans in process of foreclosure $ 942,000,000   $ 1,300