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Business Combinations - Acquisition of Happy Bancshares (Detail) - Happy Bancshares, Inc.
$ in Thousands, shares in Millions
 12 Months Ended
Apr. 01, 2022
USD ($)
location
shares
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Business Acquisition [Line Items]          
Business combination consideration paid $ 962,538        
Business combination, recognized identifiable assets acquired 6,755,152       $ 6,687,504
Loans receivable 3,657,009       3,652,620
Total deposits $ 5,854,307       $ 5,855,277
Number of locations operated by acquiree prior to acquisition | location 62,000        
Adjustment to market value - investment securities $ 8,485        
Adjustment to market value - bank premises and equipment (12,270)        
Measurement Period Adjustments, Time deposits $ 903        
Pro forma merger expenses   $ 49,600 $ 49,600    
Pro forma credit losses on acquired loans   45,200 45,200    
Pro forma credit losses on acquired unfunded commitments   $ 11,400 $ 11,400    
Pro forma credit losses on acquired investment securities       $ 2,000  
Common Stock          
Business Acquisition [Line Items]          
Business acquisition, equity interest issuable, number of shares (in shares) | shares 42.4        
Business acquisition, equity interest issuable, value $ 958,800        
Business combination consideration paid 962,500        
Stock-based Awards          
Business Acquisition [Line Items]          
Business acquisition, equity interest issuable, value $ 3,700