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Borrowed Funds - Additional Information (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2025
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2020
USD ($)
Mar. 31, 2025
USD ($)
Sep. 30, 2025
USD ($)
LettersOfCredit
Dec. 31, 2024
USD ($)
Debt Instrument [Line Items]            
Retired subordinated notes         $ 200,000  
Long-term debt         471,331 $ 385,292
FHLB Stock owned         $ 10,200 10,200
Federal Home Loan Bank [Member]            
Debt Instrument [Line Items]            
Number of letters of credit outstanding | LettersOfCredit         6  
Letter of Credit [Member] | Federal Home Loan Bank [Member]            
Debt Instrument [Line Items]            
Letter of credit         $ 203,300  
Letter of credit, expiration date         Oct. 31, 2025  
Remaining borrowing capacity         $ 1,800,000  
Subordinated notes 3.70%, net of issuance costs [Member]            
Debt Instrument [Line Items]            
Subordinated notes, issued     $ 200,000      
Debt instrument, interest rate     3.70%      
Debt instrument, maturity date     Sep. 17, 2030      
Debt instrument, frequency of periodic payment         semi-annually  
Unamortized debt issuance costs           300
Retired subordinated notes       $ 11,100    
Subordinated notes 6.25%, net of issuance costs [Member]            
Debt Instrument [Line Items]            
Subordinated notes, issued   $ 110,000        
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         $ 900 1,200
Trust Preferred Securities [Member]            
Debt Instrument [Line Items]            
Long-term debt         $ 218,929 76,782
Heartland Financial USA Inc [Member]            
Debt Instrument [Line Items]            
Long-term debt $ 278,018          
Heartland Financial USA Inc [Member] | Subordinated notes 2.75% [Member]            
Debt Instrument [Line Items]            
Subordinated notes, issued 150,000          
Fair value of subordinated notes $ 138,800          
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.  
Marquette Capital Trust I, Marquette Capital Trust II, Marquette Capital Trust III And Marquette Capital Trust IV [Member] | Marquette [Member]            
Debt Instrument [Line Items]            
Long-term debt           103,100
Long-term debt acquired at fair value           $ 76,800
Marquette Financial Companies And HTLF [Member] | Trust Preferred Securities [Member]            
Debt Instrument [Line Items]            
Long-term debt obligations aggregate contractual balance         $ 262,900  
Long-term debt         $ 218,900