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Other Real Estate Owned - Changes in the Allowance for OREO Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Change in the allowance for OREO losses      
Balance at the beginning of year $ 57 $ 57 $ 86
Provision for losses 31    
Charge-offs, net     (29)
Balance at the end of year 88 57 57
OREO, expenses other than provision for losses $ 34 $ 26 $ 72