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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 12, 2025
Jun. 30, 2024
Document and Entity Information [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Document Transition Report false    
Securities Act 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    
Title of 12(b) Security Common Stock, $1.00 Par Value    
Trading Symbol QCRH    
Security Exchange Name NASDAQ    
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    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 974,960,645
Entity Common Stock, Shares Outstanding   16,901,169  
Auditor Name RSM US LLP    
Auditor Firm ID 49    
Auditor Location Davenport, Iowa    
Entity Central Index Key 0000906465    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false