Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2021	May 07, 2021
Document Information [Line Items]
Entity Central Index Key	0000885275
Entity Registrant Name	WILSON BANK HOLDING CO
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2021
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	0-20402
Entity Incorporation, State or Country Code	TN
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
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		11,084,022