Commitments and Contingent Liabilities (Details) - The Bank of Greene County [Member] - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020
Commitments [Abstract]
Total commitments	$ 208,406	$ 170,574
Unfunded Loan Commitments [Member]
Commitments [Abstract]
Total commitments	121,775	100,241
Unused Lines of Credit [Member]
Commitments [Abstract]
Total commitments	86,456	70,333
Standby Letters of Credit [Member]
Commitments [Abstract]
Total commitments	$ 175	$ 0