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Subordinated Debentures - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Jan. 18, 2022
Jun. 30, 2024
Apr. 01, 2022
3.125% Fixed to Floating Rate Subordinated Notes due 2032      
Debt Instrument [Line Items]      
Percentage of redemption price on principal   100.00%  
Trust preferred securities, face amount $ 300.0    
Subordinated notes, Interest rate 3.125%    
Proceeds from issuance of subordinated debentures $ 296.4    
3.125% Fixed to Floating Rate Subordinated Notes due 2032 | Variable Rate Component One      
Debt Instrument [Line Items]      
Floating rate 1.82%    
Subordinated debt securities | Happy Bancshares, Inc.      
Debt Instrument [Line Items]      
Debt acquired   $ 144.4 $ 140.0
Fixed rate     5.50%
Subordinated debt securities | Happy Bancshares, Inc. | Variable Rate Component One      
Debt Instrument [Line Items]      
Floating rate   5.345%  
Subordinated debt securities | 3.125% Fixed to Floating Rate Subordinated Notes due 2032      
Debt Instrument [Line Items]      
Fixed rate   3.125%  
Subordinated debt securities | 3.125% Fixed to Floating Rate Subordinated Notes due 2032 | Variable Rate Component One      
Debt Instrument [Line Items]      
Floating rate   1.82%  
Subordinated notes, net of issuance costs, issued in 2020, due 2030, fixed rate of 5.50% during the first five years and at a floating rate of 534.5 basis points above the then three-month SOFR rate, reset quarterly, thereafter, callable in 2025 without penalty      
Debt Instrument [Line Items]      
Percentage of redemption price on principal   100.00%