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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 ($)
location
shares
Dec. 31, 2023
USD ($)
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 $ 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