| Cover | Feb. 28, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 28, 2023 |
| Entity Registrant Name | Meridian Corp |
| Entity Incorporation, State or Country Code | PA |
| Entity File Number | 000-55983 |
| Entity Tax Identification Number | 83-1561918 |
| Entity Address, Address Line One | 9 Old Lincoln Highway, Malvern, Pennsylvania |
| Entity Address, City or Town | Malvern |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 19355 |
| City Area Code | (484) 568-5000Registrant’s telephone number, including area code |
| Local Phone Number | (484) 568-5000Registrant’s telephone number, including area code |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Title of 12(b) Security | Common Stock, $1 par value |
| Trading Symbol | MRBK |
| Security Exchange Name | NASDAQ |
| Entity Central Index Key | 0001750735 |
| Amendment Flag | false |
