Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2022	Feb. 15, 2023	Jun. 30, 2022
Document and Entity Information [Abstract]
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2022
Entity File Number	0-22208
Entity Registrant Name	QCR HOLDINGS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	42-1397595
Entity Address, Address Line One	3551 7th Street
Entity Address, City or Town	Moline
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	61265
City Area Code	309
Local Phone Number	736-3580
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Title of 12(b) Security	Common Stock, $1.00 Par Value
Trading Symbol	QCRH
Security Exchange Name	NASDAQ
Entity Public Float			$ 895,098,226
Entity Common Stock, Shares Outstanding (in shares)		16,825,981
Auditor Name	RSM US LLP
Auditor Firm ID	49
Auditor Location	Davenport, Iowa
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Entity Central Index Key	0000906465
Amendment Flag	false