Regulatory Matters - Compliance with Regulatory Capital Requirements under Banking Regulations (Details) - USD ($)
$ in Thousands |
Jun. 30, 2026 |
Jun. 30, 2025 |
| Greene County Bancorp, Inc. [Member] |
|
|
| Regulatory Matters [Abstract] |
|
|
| Total risk-based capital, actual amount (in Dollars) |
$ 343,112
|
$ 324,323
|
| Total risk-based capital, actual ratio |
0.179
|
0.184
|
| Total risk-based capital for capital adequacy purposes, amount (in Dollars) |
$ 153,618
|
$ 141,308
|
| 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 (in Dollars) |
$ 192,023
|
$ 176,636
|
| 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 |
0.0987
|
0.1036
|
| Total risk-based capital for capital conservation buffer, required |
0.025
|
0.025
|
| Tier 1 risk-based capital, actual amount (in Dollars) |
$ 289,314
|
$ 252,373
|
| Tier 1 risk-based capital, actual ratio |
0.151
|
0.143
|
| Tier 1 risk-based capital for capital adequacy purposes, amount (in Dollars) |
$ 115,214
|
$ 105,981
|
| 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 (in Dollars) |
$ 153,618
|
$ 141,308
|
| 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 |
0.0907
|
0.0829
|
| Tier 1 risk-based capital for capital conservation buffer, required |
2.50%
|
2.50%
|
| Common equity tier 1 capital, actual amount (in Dollars) |
$ 289,314
|
$ 252,373
|
| Common equity tier 1 capital, actual ratio |
0.151
|
0.143
|
| Common equity tier 1 capital for capital adequacy purposes, amount (in Dollars) |
$ 86,410
|
$ 79,486
|
| 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 (in Dollars) |
$ 124,815
|
$ 114,813
|
| 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 |
0.1057
|
0.0979
|
| Common equity tier 1 capital for capital conservation buffer, required |
2.50%
|
2.50%
|
| Tier 1 leverage ratio, actual amount (in Dollars) |
$ 289,314
|
$ 252,373
|
| Tier 1 leverage ratio, actual ratio |
0.094
|
0.086
|
| Tier 1 leverage ratio for capital adequacy purposes, amount (in Dollars) |
$ 123,301
|
$ 117,627
|
| 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 (in Dollars) |
$ 154,126
|
$ 147,034
|
| 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 |
5.39%
|
4.58%
|
| Tier 1 leverage ratio for capital conservation buffer, required |
2.50%
|
2.50%
|
| The Bank of Greene County [Member] |
|
|
| Regulatory Matters [Abstract] |
|
|
| Total risk-based capital, actual amount (in Dollars) |
$ 328,258
|
$ 293,952
|
| Total risk-based capital, actual ratio |
0.171
|
0.166
|
| Total risk-based capital for capital adequacy purposes, amount (in Dollars) |
$ 153,615
|
$ 141,305
|
| 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 (in Dollars) |
$ 192,018
|
$ 176,632
|
| 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 |
0.091
|
0.0864
|
| Total risk-based capital for capital conservation buffer, required |
0.025
|
0.025
|
| Tier 1 risk-based capital, actual amount (in Dollars) |
$ 304,439
|
$ 271,869
|
| Tier 1 risk-based capital, actual ratio |
0.159
|
0.154
|
| Tier 1 risk-based capital for capital adequacy purposes, amount (in Dollars) |
$ 115,211
|
$ 105,979
|
| 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 (in Dollars) |
$ 153,615
|
$ 141,305
|
| 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
|
0.0939
|
| Tier 1 risk-based capital for capital conservation buffer, required |
2.50%
|
2.50%
|
| Common equity tier 1 capital, actual amount (in Dollars) |
$ 304,439
|
$ 271,869
|
| Common equity tier 1 capital, actual ratio |
0.159
|
0.154
|
| Common equity tier 1 capital for capital adequacy purposes, amount (in Dollars) |
$ 86,408
|
$ 79,484
|
| 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 (in Dollars) |
$ 124,812
|
$ 114,811
|
| 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
|
0.1089
|
| Common equity tier 1 capital for capital conservation buffer, required |
2.50%
|
2.50%
|
| Tier 1 leverage ratio, actual amount (in Dollars) |
$ 304,439
|
$ 271,869
|
| Tier 1 leverage ratio, actual ratio |
0.099
|
0.092
|
| Tier 1 leverage ratio for capital adequacy purposes, amount (in Dollars) |
$ 123,300
|
$ 117,646
|
| 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 (in Dollars) |
$ 154,125
|
$ 147,057
|
| 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 |
5.88%
|
5.24%
|
| Tier 1 leverage ratio for capital conservation buffer, required |
2.50%
|
2.50%
|
| Greene County Commercial Bank [Member] |
|
|
| Regulatory Matters [Abstract] |
|
|
| Total risk-based capital, actual amount (in Dollars) |
$ 136,943
|
$ 122,243
|
| Total risk-based capital, actual ratio |
0.513
|
0.469
|
| Total risk-based capital for capital adequacy purposes, amount (in Dollars) |
$ 21,365
|
$ 20,871
|
| 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 (in Dollars) |
$ 26,706
|
$ 26,089
|
| 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 |
0.4328
|
0.3886
|
| Total risk-based capital for capital conservation buffer, required |
0.025
|
0.025
|
| Tier 1 risk-based capital, actual amount (in Dollars) |
$ 136,943
|
$ 122,243
|
| Tier 1 risk-based capital, actual ratio |
0.513
|
0.469
|
| Tier 1 risk-based capital for capital adequacy purposes, amount (in Dollars) |
$ 16,024
|
$ 15,654
|
| 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 (in Dollars) |
$ 21,365
|
$ 20,871
|
| 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 |
0.4528
|
0.4086
|
| Tier 1 risk-based capital for capital conservation buffer, required |
2.50%
|
2.50%
|
| Common equity tier 1 capital, actual amount (in Dollars) |
$ 136,943
|
$ 122,243
|
| Common equity tier 1 capital, actual ratio |
0.513
|
0.469
|
| Common equity tier 1 capital for capital adequacy purposes, amount (in Dollars) |
$ 12,018
|
$ 11,740
|
| 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 (in Dollars) |
$ 17,359
|
$ 16,958
|
| 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 |
0.4678
|
0.4236
|
| Common equity tier 1 capital for capital conservation buffer, required |
2.50%
|
2.50%
|
| Tier 1 leverage ratio, actual amount (in Dollars) |
$ 136,943
|
$ 122,243
|
| Tier 1 leverage ratio, actual ratio |
0.101
|
0.091
|
| Tier 1 leverage ratio for capital adequacy purposes, amount (in Dollars) |
$ 54,484
|
$ 53,543
|
| 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 (in Dollars) |
$ 68,105
|
$ 66,929
|
| 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 |
6.05%
|
5.13%
|
| Tier 1 leverage ratio for capital conservation buffer, required |
2.50%
|
2.50%
|