{"cik":1710482,"taxonomy":"us-gaap","tag":"ShareBasedCompensation","label":"Share-based Payment Arrangement, Noncash Expense","description":"Amount of noncash expense for share-based payment arrangement.","entityName":"John Marshall Bancorp, Inc.","units":{"USD":[{"start":"2021-01-01","end":"2021-03-31","val":149000,"accn":"0001558370-22-009343","fy":2022,"fp":"Q1","form":"10-Q","filed":"2022-05-25","frame":"CY2021Q1"},{"start":"2021-01-01","end":"2021-06-30","val":277000,"accn":"0001558370-22-012987","fy":2022,"fp":"Q2","form":"10-Q","filed":"2022-08-10"},{"start":"2021-01-01","end":"2021-09-30","val":396000,"accn":"0001558370-22-017044","fy":2022,"fp":"Q3","form":"10-Q","filed":"2022-11-09"},{"start":"2021-01-01","end":"2021-12-31","val":560000,"accn":"0001558370-23-004473","fy":2022,"fp":"FY","form":"10-K","filed":"2023-03-23","frame":"CY2021"},{"start":"2022-01-01","end":"2022-03-31","val":139000,"accn":"0001558370-22-009343","fy":2022,"fp":"Q1","form":"10-Q","filed":"2022-05-25"},{"start":"2022-01-01","end":"2022-03-31","val":139000,"accn":"0001558370-23-008965","fy":2023,"fp":"Q1","form":"10-Q","filed":"2023-05-10","frame":"CY2022Q1"},{"start":"2022-01-01","end":"2022-06-30","val":269000,"accn":"0001558370-22-012987","fy":2022,"fp":"Q2","form":"10-Q","filed":"2022-08-10"},{"start":"2022-01-01","end":"2022-06-30","val":269000,"accn":"0001558370-23-014105","fy":2023,"fp":"Q2","form":"10-Q","filed":"2023-08-09"},{"start":"2022-01-01","end":"2022-09-30","val":402000,"accn":"0001558370-22-017044","fy":2022,"fp":"Q3","form":"10-Q","filed":"2022-11-09"},{"start":"2022-01-01","end":"2022-09-30","val":402000,"accn":"0001558370-23-018129","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-11-08"},{"start":"2022-01-01","end":"2022-12-31","val":573000,"accn":"0001558370-23-004473","fy":2022,"fp":"FY","form":"10-K","filed":"2023-03-23"},{"start":"2022-01-01","end":"2022-12-31","val":573000,"accn":"0001558370-24-003634","fy":2023,"fp":"FY","form":"10-K","filed":"2024-03-20","frame":"CY2022"},{"start":"2023-01-01","end":"2023-03-31","val":197000,"accn":"0001558370-23-008965","fy":2023,"fp":"Q1","form":"10-Q","filed":"2023-05-10"},{"start":"2023-01-01","end":"2023-03-31","val":197000,"accn":"0001558370-24-008074","fy":2024,"fp":"Q1","form":"10-Q","filed":"2024-05-14","frame":"CY2023Q1"},{"start":"2023-01-01","end":"2023-06-30","val":334000,"accn":"0001558370-23-014105","fy":2023,"fp":"Q2","form":"10-Q","filed":"2023-08-09"},{"start":"2023-01-01","end":"2023-06-30","val":334000,"accn":"0001558370-24-011986","fy":2024,"fp":"Q2","form":"10-Q","filed":"2024-08-13"},{"start":"2023-01-01","end":"2023-09-30","val":464000,"accn":"0001558370-23-018129","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-11-08"},{"start":"2023-01-01","end":"2023-09-30","val":464000,"accn":"0001558370-24-015445","fy":2024,"fp":"Q3","form":"10-Q","filed":"2024-11-13"},{"start":"2023-01-01","end":"2023-12-31","val":596000,"accn":"0001558370-24-003634","fy":2023,"fp":"FY","form":"10-K","filed":"2024-03-20"},{"start":"2023-01-01","end":"2023-12-31","val":596000,"accn":"0001558370-25-003982","fy":2024,"fp":"FY","form":"10-K","filed":"2025-03-28","frame":"CY2023"},{"start":"2024-01-01","end":"2024-03-31","val":132000,"accn":"0001558370-24-008074","fy":2024,"fp":"Q1","form":"10-Q","filed":"2024-05-14"},{"start":"2024-01-01","end":"2024-03-31","val":132000,"accn":"0001558370-25-007505","fy":2025,"fp":"Q1","form":"10-Q","filed":"2025-05-13","frame":"CY2024Q1"},{"start":"2024-01-01","end":"2024-06-30","val":265000,"accn":"0001558370-24-011986","fy":2024,"fp":"Q2","form":"10-Q","filed":"2024-08-13"},{"start":"2024-01-01","end":"2024-06-30","val":265000,"accn":"0001558370-25-011157","fy":2025,"fp":"Q2","form":"10-Q","filed":"2025-08-12"},{"start":"2024-01-01","end":"2024-09-30","val":397000,"accn":"0001558370-24-015445","fy":2024,"fp":"Q3","form":"10-Q","filed":"2024-11-13"},{"start":"2024-01-01","end":"2024-09-30","val":397000,"accn":"0001104659-25-112012","fy":2025,"fp":"Q3","form":"10-Q","filed":"2025-11-14"},{"start":"2024-01-01","end":"2024-12-31","val":555000,"accn":"0001558370-25-003982","fy":2024,"fp":"FY","form":"10-K","filed":"2025-03-28"},{"start":"2024-01-01","end":"2024-12-31","val":555000,"accn":"0001104659-26-027378","fy":2025,"fp":"FY","form":"10-K","filed":"2026-03-13","frame":"CY2024"},{"start":"2025-01-01","end":"2025-03-31","val":118000,"accn":"0001558370-25-007505","fy":2025,"fp":"Q1","form":"10-Q","filed":"2025-05-13"},{"start":"2025-01-01","end":"2025-03-31","val":118000,"accn":"0001104659-26-057594","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-08","frame":"CY2025Q1"},{"start":"2025-01-01","end":"2025-06-30","val":238000,"accn":"0001558370-25-011157","fy":2025,"fp":"Q2","form":"10-Q","filed":"2025-08-12"},{"start":"2025-01-01","end":"2025-09-30","val":358000,"accn":"0001104659-25-112012","fy":2025,"fp":"Q3","form":"10-Q","filed":"2025-11-14"},{"start":"2025-01-01","end":"2025-12-31","val":527000,"accn":"0001104659-26-027378","fy":2025,"fp":"FY","form":"10-K","filed":"2026-03-13","frame":"CY2025"},{"start":"2026-01-01","end":"2026-03-31","val":141000,"accn":"0001104659-26-057594","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-08","frame":"CY2026Q1"}]}}