Regulatory Matters (Details) $ in Thousands	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)
The Bank of Greene County [Member]
Compliance with Regulatory Capital [Abstract]
Total risk-based capital, actual amount	$ 273,460	$ 249,165
Total risk-based capital, actual ratio	0.171	0.165
Total risk-based capital for capital adequacy purposes, amount	$ 127,873	$ 121,020
Total risk-based capital for capital adequacy purposes, ratio	0.08	0.08
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 159,841	$ 151,275
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.10	0.10
Total risk-based capital for capital conservation buffer, actual	0.0911	0.0847
Total risk-based capital for capital conservation buffer, required	0.025	0.025
Tier 1 risk-based capital, actual amount	$ 253,468	$ 230,228
Tier 1 risk-based capital, actual ratio	0.159	0.152
Tier 1 risk-based capital for capital adequacy purposes, amount	$ 95,905	$ 90,765
Tier 1 risk-based capital for capital adequacy purposes, ratio	0.06	0.06
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 127,873	$ 121,020
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.08	0.08
Tier 1 risk-based capital for capital conservation buffer, actual	0.0986	0.0922
Tier 1 risk-based capital for capital conservation buffer, required	2.50%	2.50%
Common equity tier 1 capital, actual amount	$ 253,468	$ 230,228
Common equity tier 1 capital, actual ratio	0.159	0.152
Common equity tier 1 capital for capital adequacy purposes, amount	$ 71,929	$ 68,074
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	$ 103,897	$ 98,328
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	0.1136	0.1072
Common equity tier 1 capital for capital conservation buffer, required	2.50%	2.50%
Tier 1 leverage ratio, actual amount	$ 253,468	$ 230,228
Tier 1 leverage ratio, actual ratio	0.093	0.087
Tier 1 leverage ratio for capital adequacy purposes, amount	$ 109,102	$ 106,141
Tier 1 leverage ratio for capital adequacy purposes, ratio	0.04	0.04
Tier 1 leverage ratio to be well capitalized under prompt corrective action provisions, amount	$ 136,378	$ 132,676
Tier 1 leverage ratio to be well capitalized under prompt corrective action provisions, ratio	0.05	0.05
Tier 1 leverage ratio for capital conservation buffer, actual	5.29%	4.68%
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	$ 110,319	$ 104,781
Total risk-based capital, actual ratio	0.495	0.466
Total risk-based capital for capital adequacy purposes, amount	$ 17,830	$ 17,975
Total risk-based capital for capital adequacy purposes, ratio	0.08	0.08
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 22,288	$ 22,469
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.10	0.10
Total risk-based capital for capital conservation buffer, actual	0.415	0.3863
Total risk-based capital for capital conservation buffer, required	0.025	0.025
Tier 1 risk-based capital, actual amount	$ 110,319	$ 104,781
Tier 1 risk-based capital, actual ratio	0.495	0.466
Tier 1 risk-based capital for capital adequacy purposes, amount	$ 13,373	$ 13,481
Tier 1 risk-based capital for capital adequacy purposes, ratio	0.06	0.06
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 17,830	$ 17,975
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.08	0.08
Tier 1 risk-based capital for capital conservation buffer, actual	0.435	0.4063
Tier 1 risk-based capital for capital conservation buffer, required	2.50%	2.50%
Common equity tier 1 capital, actual amount	$ 110,319	$ 104,781
Common equity tier 1 capital, actual ratio	0.495	0.466
Common equity tier 1 capital for capital adequacy purposes, amount	$ 10,029	$ 10,111
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	$ 14,487	$ 14,605
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	0.45	0.4213
Common equity tier 1 capital for capital conservation buffer, required	2.50%	2.50%
Tier 1 leverage ratio, actual amount	$ 110,319	$ 104,781
Tier 1 leverage ratio, actual ratio	0.091	0.091
Tier 1 leverage ratio for capital adequacy purposes, amount	$ 48,385	$ 45,958
Tier 1 leverage ratio for capital adequacy purposes, ratio	0.04	0.04
Tier 1 leverage ratio to be well capitalized under prompt corrective action provisions, amount	$ 60,481	$ 57,447
Tier 1 leverage ratio to be well capitalized under prompt corrective action provisions, ratio	0.05	0.05
Tier 1 leverage ratio for capital conservation buffer, actual	5.12%	5.12%
Tier 1 leverage ratio for capital conservation buffer, required	2.50%	2.50%