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Loans (Details 4) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2019
Receivables [Abstract]              
Total loans considered impaired $ 3,419 $ 4,643   $ 3,419 $ 4,643   $ 3,997
Loans considered impaired for which there is a related allowance for loan loss:              
Outstanding loan balance 193     193     256
Related allowance 4 12   4 12   6
Loans considered impaired and previously written down to fair value 2,176     2,176     2,275
Average impaired loans 3,731 $ 4,768   3,810 4,797   4,431
Amount of interest earned during period of impairment $ 85   $ 105 $ 165 $ 205 $ 263 $ 263