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Acquisition - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jan. 31, 2025
Mar. 31, 2026
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Jan. 01, 2026
Business Combination [Line Items]                
Preferred stock, shares issued   30,000       30,000    
Goodwill   $ 1,837,594       $ 1,839,825 $ 207,385  
Fair value of PCD Loans $ 3,046,521              
Fair value of Non-PCD 9,734,711              
Unpaid principal balance 10,304,570              
Long-term debt   477,164       474,229    
Net income available to common shareholders   $ 255,625     $ 79,320      
Basic earnings per share   $ 3.36     $ 1.22      
PCD ACL at acquisition 85,299       $ 62,126      
PCD                
Business Combination [Line Items]                
Fair value of Non-PCD 3,046,521              
Unpaid principal balance 3,237,332              
Non-PCD                
Business Combination [Line Items]                
Fair value of Non-PCD 6,688,190              
Unpaid principal balance $ 7,067,238              
Commercial Banking [Member]                
Business Combination [Line Items]                
Goodwill   $ 1,041,238       1,042,577 63,113  
Personal Banking [Member]                
Business Combination [Line Items]                
Goodwill   719,864       720,756 67,780  
Preferred Stock [Member]                
Business Combination [Line Items]                
Business combination, consideration shares value         115,230      
Common Stock [Member]                
Business Combination [Line Items]                
Business combination, consideration shares value         $ 2,783,510      
Heartland Financial USA Inc [Member]                
Business Combination [Line Items]                
Acquisition date Jan. 31, 2025              
Business acquisition, all-stock transaction shares issued 23,600,000              
Preferred stock, shares issued 4,600,000              
Date of merger Apr. 28, 2024              
Business combination, consideration shares value $ 2,919,129              
Business acquisition exchange ratio on common stock 0.55              
Tax deductible goodwill $ 44,000              
Goodwill 1,630,209              
Identifiable intangible assets 511,021              
Loans acquired from HTLF 9,734,711              
Fair value of PCD Loans 3,000,000              
Core deposit intangible asset 474,100              
Customer lists 26,000              
Purchased credit card relationships 10,900              
Business acquisition transaction costs 140,100         142,000    
Provision expense related to acquisition 62,000              
Net accretion of fair value marks           12,800 153,100  
Net amortization of intangibles and fair value marks           8,000 96,000  
Revenues           2,700,000 2,500,000  
Net income available to common shareholders           $ 843,300 $ 504,000  
Basic earnings per share           $ 11.2 $ 6.96  
Valuation allowance               $ 2,200
Net assets acquired 2,919,129              
PCD ACL at acquisition   $ 62,100 $ 8,000 $ 15,200        
Heartland Financial USA Inc [Member] | Subordinated notes 2.75% [Member]                
Business Combination [Line Items]                
Subordinated notes, issued $ 150,000              
Debt instrument, interest rate 2.75%              
Fair value of subordinated notes $ 138,800              
Maturity Date Sep. 15, 2031              
Heartland Financial USA Inc [Member] | Trust Preferred Securities [Member]                
Business Combination [Line Items]                
Long-term debt $ 159,800              
Long-term debt, fair value $ 139,300              
Heartland Financial USA Inc [Member] | Trust Preferred Securities [Member] | Maximum [Member]                
Business Combination [Line Items]                
Interest rates 8.21%              
Maturity Date   Sep. 30, 2037            
Heartland Financial USA Inc [Member] | Trust Preferred Securities [Member] | Minimum [Member]                
Business Combination [Line Items]                
Interest rates 5.89%              
Maturity Date   Sep. 30, 2032            
Heartland Financial USA Inc [Member] | Commercial Banking [Member]                
Business Combination [Line Items]                
Goodwill $ 978,100              
Heartland Financial USA Inc [Member] | Personal Banking [Member]                
Business Combination [Line Items]                
Goodwill $ 652,100              
Heartland Financial USA Inc [Member] | Preferred Stock [Member]                
Business Combination [Line Items]                
Preferred stock, fixed rate percentage 7.00%              
Business combination, consideration shares value $ 115,230              
Business acquisition, share price $ 25.05              
Heartland Financial USA Inc [Member] | Common Stock [Member]                
Business Combination [Line Items]                
Business combination, consideration shares value $ 2,783,510              
Business acquisition, share price $ 117.9