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Loans - Repossessed Assets (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Repossessed and foreclosed assets        
Other real estate owned $ 5,004,000 $ 7,175,000 $ 8,371,000 $ 11,916,000
Consumer        
Repossessed and foreclosed assets        
Mortgage loans in process of foreclosure $ 831,000 $ 448,000