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Loans - Repossessed Assets (Details) - USD ($)
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Repossessed and foreclosed assets            
Mortgage loans in process of foreclosure $ 1,200,000          
Other real estate owned 9,024,000 $ 11,724,000 $ 11,916,000 $ 14,144,000 $ 16,252,000 $ 19,141,000
Real estate - residential            
Repossessed and foreclosed assets            
Mortgage loans in process of foreclosure 1,200,000   1,800,000      
Other real estate owned $ 937,000   $ 225,000