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Revenue Recognition - OREO Income (Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenue from Contract with Customer [Abstract]        
Gains (losses) on sales of OREO $ (16) $ 79 $ (13) $ 151