v3.26.1
Acquisition - Summary of PCD Loans Purchased (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Business Combination [Line Items]          
Principal of PCD loans acquired $ 3,237,332        
PCD ACL at acquisition (85,299)   $ (15,167)   $ (77,293)
Non-credit discount on PCD loans (105,512)        
Fair value of PCD Loans 3,046,521        
Heartland Financial USA Inc [Member]          
Business Combination [Line Items]          
PCD ACL at acquisition   $ (8,000) $ (15,200) $ (62,100)  
Fair value of PCD Loans $ 3,000,000