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Other Real Estate Owned - Additional Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Real Estate [Line Items]        
Foreclosed real estate properties recorded as result of obtaining physical possession of property $ 10,626 $ 16,570 $ 26,715 $ 56,181
Residential consumer mortgage loans in process of foreclosure 1,900 2,700    
Residential Real Estate        
Real Estate [Line Items]        
Foreclosed real estate properties recorded as result of obtaining physical possession of property $ 3,600 $ 3,300