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Cover - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 21, 2024
Jun. 30, 2023
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-15393    
Entity Registrant Name HEARTLAND FINANCIAL USA, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 42-1405748    
Entity Address, Address Line One 1800 Larimer Street, Suite 1800    
Entity Address, City or Town Denver    
Entity Address, State or Province CO    
Entity Address, Postal Zip Code 80202    
City Area Code (303)    
Local Phone Number 285-9200    
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 false    
Entity Shell Company false    
Documents Incorporated by Reference
Portions of the Proxy Statement for the 2024 Annual Meeting of Stockholders, which will be filed no later than 120 days after December 31, 2023, are incorporated by reference into Part III.
    
Entity Central Index Key 0000920112    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   42,689,058  
Entity Public Float     $ 1,167,506,494
Common Stock $1.00 par value      
Document Information [Line Items]      
Title of 12(b) Security Common Stock $1.00 par value    
Trading Symbol HTLF    
Security Exchange Name NASDAQ    
Depositary Shares, each representing 1/400th interest in a share of 7.00% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E      
Document Information [Line Items]      
Title of 12(b) Security Depositary Shares, each representing 1/400th interest in a share of 7.00% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E    
Trading Symbol HTLFP    
Security Exchange Name NASDAQ