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Subordinated Debentures - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 18, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Apr. 01, 2022
Debt Instrument [Line Items]            
Subordinated debentures   $ 439,246 $ 439,834      
Trust preferred securities, face amount $ 300,000          
Subordinated notes, interest rate 3.125%          
Net proceeds $ 296,400 0 0 $ 296,324    
Variable Rate Component One | 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]            
Floating rate above three-month LIBOR rate 1.82%          
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]            
Subordinated debentures   $ 298,482 $ 297,750      
Fixed rate for first five years   3.125% 3.125%      
Subordinated debt securities | Variable Rate Component One | 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]            
Floating rate above three-month LIBOR rate   1.82% 1.82%      
Subordinated notes issued in 2020, due 2030, fixed rate of 5.500% 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%        
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%        
Happy Bancshares, Inc.            
Debt Instrument [Line Items]            
Subordinated debentures         $ 167,590 $ 159,965
Happy Bancshares, Inc. | Subordinated debt securities            
Debt Instrument [Line Items]            
Subordinated debentures   $ 144,400       $ 140,000
Fixed rate for first five years           5.50%
Happy Bancshares, Inc. | Subordinated debt securities | Variable Rate Component One            
Debt Instrument [Line Items]            
Floating rate above three-month LIBOR rate   5.345%