{"cik":2094107,"taxonomy":"us-gaap","tag":"EarningsPerShareBasic","label":"Earnings Per Share, Basic","description":"The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.","entityName":"Ballston Spa Bancorp, Inc.","units":{"USD/shares":[{"start":"2024-01-01","end":"2024-12-31","val":6.91,"accn":"0001104659-26-048543","fy":null,"fp":null,"form":"SP 15D2","filed":"2026-04-24","frame":"CY2024"},{"start":"2025-01-01","end":"2025-03-31","val":1.75,"accn":"0001104659-26-061067","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-14","frame":"CY2025Q1"},{"start":"2025-01-01","end":"2025-06-30","val":3.41,"accn":"0001104659-26-097039","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-14"},{"start":"2025-04-01","end":"2025-06-30","val":1.66,"accn":"0001104659-26-097039","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-14","frame":"CY2025Q2"},{"start":"2025-01-01","end":"2025-12-31","val":6.11,"accn":"0001104659-26-048543","fy":null,"fp":null,"form":"SP 15D2","filed":"2026-04-24","frame":"CY2025"},{"start":"2026-01-01","end":"2026-03-31","val":0.33,"accn":"0001104659-26-061067","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-14","frame":"CY2026Q1"},{"start":"2026-01-01","end":"2026-06-30","val":-0.51,"accn":"0001104659-26-097039","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-14"},{"start":"2026-04-01","end":"2026-06-30","val":-0.65,"accn":"0001104659-26-097039","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-14","frame":"CY2026Q2"}]}}