Regulatory Matters (Details) $ in Thousands	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)
The Bank of Greene County [Member]
Compliance with Regulatory Capital [Abstract]
Total risk-based capital, actual amount	$ 221,236	$ 184,063
Total risk-based capital, actual ratio	0.160	0.169
Total risk-based capital for capital adequacy purposes, amount	$ 110,294	$ 87,384
Total risk-based capital for capital adequacy purposes, ratio	0.080	0.080
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 137,867	$ 109,230
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.100	0.100
Total risk-based capital for capital conservation buffer, actual	0.0805	0.0885
Total risk-based capital for capital conservation buffer, required	0.0250	0.0250
Tier 1 risk-based capital, actual amount	$ 203,935	$ 170,335
Tier 1 risk-based capital, actual ratio	0.148	0.156
Tier 1 risk-based capital for capital adequacy purposes, amount	$ 82,720	$ 65,538
Tier 1 risk-based capital for capital adequacy purposes, ratio	0.060	0.060
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 110,294	$ 87,384
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.080	0.080
Tier 1 risk-based capital for capital conservation buffer, actual	0.0879	0.0959
Tier 1 risk-based capital for capital conservation buffer, required	2.50%	2.50%
Common equity tier 1 capital, actual amount	$ 203,935	$ 170,335
Common equity tier 1 capital, actual ratio	0.148	0.156
Common equity tier 1 capital for capital adequacy purposes, amount	$ 62,040	$ 49,154
Common equity tier 1 capital for capital adequacy purposes, ratio	0.045	0.045
Common equity tier 1 capital to be well capitalized under prompt corrective action provisions, amount	$ 89,614	$ 71,000
Common equity tier 1 capital to be well capitalized under prompt corrective action provisions, ratio	0.065	0.065
Common equity tier 1 capital for capital conservation buffer, actual	0.1029	0.1109
Common equity tier 1 capital for capital conservation buffer, required	2.50%	2.50%
Tier 1 leverage ratio, actual amount	$ 203,935	$ 170,335
Tier 1 leverage ratio, actual ratio	0.081	0.080
Tier 1 leverage ratio for capital adequacy purposes, amount	$ 100,193	$ 85,382
Tier 1 leverage ratio for capital adequacy purposes, ratio	0.040	0.040
Tier 1 leverage ratio to be well capitalized under prompt corrective action provisions, amount	$ 125,242	$ 106,728
Tier 1 leverage ratio to be well capitalized under prompt corrective action provisions, ratio	0.050	0.050
Tier 1 leverage ratio for capital conservation buffer, actual	4.14%	3.98%
Tier 1 leverage ratio for capital conservation buffer, required	2.50%	2.50%
Greene County Commercial Bank [Member]
Compliance with Regulatory Capital [Abstract]
Total risk-based capital, actual amount	$ 94,408	$ 68,116
Total risk-based capital, actual ratio	0.415	0.402
Total risk-based capital for capital adequacy purposes, amount	$ 18,195	$ 13,566
Total risk-based capital for capital adequacy purposes, ratio	0.080	0.080
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 22,744	$ 16,958
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.100	0.100
Total risk-based capital for capital conservation buffer, actual	0.3351	0.3217
Total risk-based capital for capital conservation buffer, required	0.0250	0.0250
Tier 1 risk-based capital, actual amount	$ 94,408	$ 68,116
Tier 1 risk-based capital, actual ratio	0.415	0.402
Tier 1 risk-based capital for capital adequacy purposes, amount	$ 13,646	$ 10,175
Tier 1 risk-based capital for capital adequacy purposes, ratio	0.060	0.060
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 18,195	$ 13,566
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.080	0.080
Tier 1 risk-based capital for capital conservation buffer, actual	0.3551	0.3417
Tier 1 risk-based capital for capital conservation buffer, required	2.50%	2.50%
Common equity tier 1 capital, actual amount	$ 94,408	$ 68,116
Common equity tier 1 capital, actual ratio	0.415	0.402
Common equity tier 1 capital for capital adequacy purposes, amount	$ 10,235	$ 7,631
Common equity tier 1 capital for capital adequacy purposes, ratio	0.045	0.045
Common equity tier 1 capital to be well capitalized under prompt corrective action provisions, amount	$ 14,783	$ 11,023
Common equity tier 1 capital to be well capitalized under prompt corrective action provisions, ratio	0.065	0.065
Common equity tier 1 capital for capital conservation buffer, actual	0.3701	0.3567
Common equity tier 1 capital for capital conservation buffer, required	2.50%	2.50%
Tier 1 leverage ratio, actual amount	$ 94,408	$ 68,116
Tier 1 leverage ratio, actual ratio	0.081	0.079
Tier 1 leverage ratio for capital adequacy purposes, amount	$ 46,874	$ 34,412
Tier 1 leverage ratio for capital adequacy purposes, ratio	0.040	0.040
Tier 1 leverage ratio to be well capitalized under prompt corrective action provisions, amount	$ 58,593	$ 43,015
Tier 1 leverage ratio to be well capitalized under prompt corrective action provisions, ratio	0.050	0.050
Tier 1 leverage ratio for capital conservation buffer, actual	4.06%	3.92%
Tier 1 leverage ratio for capital conservation buffer, required	2.50%	2.50%