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Loans - Repossessed Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Repossessed and foreclosed assets    
Other real estate owned $ 6,365 $ 7,175
Residential Portfolio Segment [Member]    
Repossessed and foreclosed assets    
Mortgage loans in process of foreclosure $ 443,000,000 $ 448,000,000