{"cik":2084261,"taxonomy":"us-gaap","tag":"Assets","label":"Assets","description":"Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.","entityName":"URSB Bancorp, Inc.","units":{"USD":[{"end":"2025-12-31","val":367973000,"accn":"0001104659-26-062077","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-15"},{"end":"2025-12-31","val":367973000,"accn":"0001104659-26-096671","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-14","frame":"CY2025Q4I"},{"end":"2026-03-31","val":380606000,"accn":"0001104659-26-062077","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-15","frame":"CY2026Q1I"},{"end":"2026-06-30","val":381513000,"accn":"0001104659-26-096671","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-14","frame":"CY2026Q2I"}]}}