Commitments and Contingent Liabilities (Details) - The Bank of Greene County [Member] - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total commitments	$ 72,019	$ 57,706
Unfunded Loan Commitments [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total commitments	41,383	27,449
Unused Lines of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total commitments	$ 30,636	$ 30,257