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Loans - Repossessed Assets (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Repossessed and foreclosed assets        
Other real estate owned $ 7,063,000 $ 8,371,000 $ 13,481,000 $ 11,916,000
Real estate - residential        
Repossessed and foreclosed assets        
Mortgage loans in process of foreclosure 1,800,000 1,300,000    
Other real estate owned $ 257,000 $ 900,000