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Borrowed Funds - Additional Information (Detail)
 1 Months Ended 3 Months Ended
Jan. 31, 2025
USD ($)
Sep. 30, 2022
USD ($)
Mar. 31, 2026
USD ($)
LettersOfCredit
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Debt Instrument [Line Items]          
Retired subordinated notes       $ 11,055,000  
Long-term debt     $ 477,164,000   $ 474,229,000
FHLB Stock owned     10,300,000   10,300,000
Federal Home Loan Bank [Member]          
Debt Instrument [Line Items]          
Short-term borrowing outstanding     0   0
Letter of Credit [Member] | Federal Home Loan Bank [Member]          
Debt Instrument [Line Items]          
Letter of credit     $ 210,000,000    
Letter of credit, expiration date     Aug. 31, 2026    
Remaining borrowing capacity     $ 2,300,000,000    
Number of letters of credit outstanding | LettersOfCredit     4    
Subordinated notes 6.25%, net of issuance costs [Member]          
Debt Instrument [Line Items]          
Subordinated notes, issued   $ 110,000,000      
Debt instrument, interest rate   6.25%      
Debt instrument, maturity date   Sep. 28, 2032      
Debt instrument, frequency of periodic payment     semi-annually    
Debt instrument, redemption, description     The Company may redeem the notes, in whole or in part, on September 28, 2027, or on any interest payment date thereafter.    
Debt instrument, redemption period, start date   Sep. 28, 2027      
Unamortized debt issuance costs     $ 600,000   700,000
Trust Preferred Securities [Member]          
Debt Instrument [Line Items]          
Long-term debt obligations aggregate contractual balance     262,900,000   262,900,000
Long-term debt     $ 221,176,000   $ 220,034,000
Heartland Financial USA Inc [Member]          
Debt Instrument [Line Items]          
Long-term debt $ 278,018,000        
Heartland Financial USA Inc [Member] | Subordinated notes 2.75% [Member]          
Debt Instrument [Line Items]          
Subordinated notes, issued 150,000,000        
Fair value of subordinated notes $ 138,800,000        
Debt instrument, interest rate 2.75%        
Debt instrument, maturity date Sep. 15, 2031        
Debt instrument, frequency of periodic payment     semi-annually    
Debt instrument, redemption, description     The Company may redeem the notes, in whole or in part, on September 15, 2026, or on any interest payment date thereafter.