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Other Real Estate Owned - Change in OREO (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Changes in the balance for OREO        
Balance at the beginning of year, gross $ 303 $ 225    
Additions 1,401 98    
Sales proceeds (521) (18)    
Gain (loss) on disposition 8 (2)    
Balance at the end of year, gross 1,191 303    
Less allowance for losses (88) (57) $ (57) $ (86)
Balance at the end of the year, net $ 1,103 $ 246