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Subordinated Debentures - Additional Information (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jan. 18, 2022
Jun. 30, 2025
Dec. 31, 2024
Jul. 31, 2025
Apr. 01, 2022
Debt Instrument [Line Items]          
Subordinated debentures   $ 438,957 $ 439,246    
Subordinated notes, net of issuance costs, issued in 2022, due 2032, fixed rate of 3.125% during the first five years and at a floating rate of 182 basis points above the then three-month SOFR rate, reset quarterly, thereafter, callable in 2027 without penalty          
Debt Instrument [Line Items]          
Percentage of redemption price on principal   100.00%      
Trust preferred securities, face amount $ 300,000        
Subordinated notes, Interest rate 3.125%        
Net proceeds $ 296,400        
Subordinated notes, net of issuance costs, issued in 2022, due 2032, fixed rate of 3.125% during the first five years and at a floating rate of 182 basis points above the then three-month SOFR rate, reset quarterly, thereafter, callable in 2027 without penalty | Variable Rate Component One          
Debt Instrument [Line Items]          
Floating rate above three-month LIBOR rate 1.82%        
Subordinated debt securities | Happy Bancshares, Inc.          
Debt Instrument [Line Items]          
Subordinated debentures   $ 144,400     $ 140,000
Fixed rate for first five years         5.50%
Subordinated debt securities | Happy Bancshares, Inc. | Variable Rate Component One          
Debt Instrument [Line Items]          
Floating rate above three-month LIBOR rate   5.345%      
Subordinated debt securities | 2030 Notes          
Debt Instrument [Line Items]          
Fixed rate for first five years   5.50% 5.50%    
Subordinated debentures   $ 140,112 $ 140,764    
Subordinated debt securities | 2030 Notes | Subsequent Event          
Debt Instrument [Line Items]          
Percentage of redemption price on principal       100.00%  
Subordinated debentures       $ 140,000  
Subordinated debt securities | 2030 Notes | Variable Rate Component One          
Debt Instrument [Line Items]          
Floating rate above three-month LIBOR rate   5.345% 5.345%    
Subordinated debt securities | Subordinated notes, net of issuance costs, issued in 2022, due 2032, fixed rate of 3.125% during the first five years and at a floating rate of 182 basis points above the then three-month SOFR rate, reset quarterly, thereafter, callable in 2027 without penalty          
Debt Instrument [Line Items]          
Fixed rate for first five years   3.125% 3.125%    
Subordinated debentures   $ 298,845 $ 298,482    
Subordinated debt securities | Subordinated notes, net of issuance costs, issued in 2022, due 2032, fixed rate of 3.125% during the first five years and at a floating rate of 182 basis points above the then three-month SOFR rate, reset quarterly, thereafter, callable in 2027 without penalty | Variable Rate Component One          
Debt Instrument [Line Items]          
Floating rate above three-month LIBOR rate   1.82% 1.82%    
2030 Notes          
Debt Instrument [Line Items]          
Percentage of redemption price on principal   100.00%