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Acquisition - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
 3 Months Ended 9 Months Ended
Jan. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Business Combination [Line Items]                
Goodwill   $ 1,835,298     $ 1,835,298   $ 207,385 $ 207,385
Fair value of PCD Loans $ 3,046,521              
Long-term debt   471,331     471,331   385,292  
Net income available to common shareholders   $ 180,372   $ 109,643 $ 475,074 $ 321,246    
Basic earnings per share   $ 2.38   $ 2.25 $ 6.57 $ 6.59    
PCD ACL at acquisition $ 85,299 $ 8,006     $ 85,299      
Commercial Banking [Member]                
Business Combination [Line Items]                
Goodwill   1,039,861     1,039,861   63,113 63,113
Personal Banking [Member]                
Business Combination [Line Items]                
Goodwill   718,945     718,945   $ 67,780 $ 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, shares issuable 23.6              
Preferred stock, shares issued 4.6              
Date of merger Apr. 28, 2024              
Business acquisition exchange ratio on common stock 0.55              
Business combination, consideration shares value $ 2,919,129              
Tax deductible goodwill 44,000              
Goodwill 1,627,913              
Identifiable intangible assets 511,021 511,000     511,000      
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 100,400 102,300     102,300      
Provision expense related to acquisition 62,000              
Net accretion of fair value marks         8,700 $ 103,800    
Net amortization of intangibles and fair value marks         8,000 72,000    
Revenues         1,900,000 1,800,000    
Net income available to common shareholders         $ 600,400 $ 379,300    
Basic earnings per share         $ 8 $ 5.24    
Net assets acquired 2,919,129 (22,600)     $ (22,600)      
Decrease in the value of investment securities         (18,100)      
PCD ACL at acquisition   $ 8,000 $ 15,200   $ 62,100      
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 $ 976,700              
Heartland Financial USA Inc [Member] | Personal Banking [Member]                
Business Combination [Line Items]                
Goodwill $ 651,200              
Heartland Financial USA Inc [Member] | Preferred Stock [Member]                
Business Combination [Line Items]                
Preferred stock, fixed rate percentage 7.00%              
Business acquisition, share price $ 25.05              
Business combination, consideration shares value $ 115,230              
Heartland Financial USA Inc [Member] | Common Stock [Member]                
Business Combination [Line Items]                
Business acquisition, share price $ 117.9              
Business combination, consideration shares value $ 2,783,510