| Document And Entity Information | Apr. 06, 2020 |
| Document Information [Line Items] | |
| Entity, Registrant Name | WILSON BANK HOLDING COMPANY |
| Document, Type | 8-K/A |
| Document, Period End Date | Apr. 6, 2020 |
| Entity, Incorporation, State or Country Code | TN |
| Entity, File Number | 000-20402 |
| Entity, Tax Identification Number | 62-1497076 |
| Entity, Address, Address Line One | 623 West Main Street |
| Entity, Address, City or Town | Lebanon |
| Entity, Address, State or Province | TN |
| Entity, Address, Postal Zip Code | 37087 |
| City Area Code | 615 |
| Local Phone Number | 444-2265 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | None |
| Entity, Emerging Growth Company | false |
| Amendment Description | Shareholder letter refile |
| Amendment Flag | true |
| Entity, Central Index Key | 0000885275 |
