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Subordinated Debentures - Additional Information (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jan. 18, 2022
Apr. 03, 2017
Sep. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jun. 30, 2022
Apr. 01, 2022
Debt Instrument [Line Items]                
Subordinated debentures       $ 439,834 $ 440,420      
Retirement of subordinated debentures       0 300,000 $ 0    
Trust preferred securities, face amount $ 300,000              
Subordinated notes, interest rate 3.125%              
Net proceeds $ 296,400     0 296,324 $ 0    
Happy Bancshares, Inc.                
Debt Instrument [Line Items]                
Subordinated debentures             $ 167,590 $ 159,965
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | 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%              
Trust Preferred Securities                
Debt Instrument [Line Items]                
Face value of company held trust preferred securities       23,200        
Retirement of subordinated debentures     $ 73,300          
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       $ 297,750 $ 297,020      
Fixed rate for first five years       3.125% 3.125%      
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 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | 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 debt securities | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Happy Bancshares, Inc.                
Debt Instrument [Line Items]                
Floating rate above three-month LIBOR rate     5.345%          
5.500% Subordinated Notes due 2030                
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%        
5.625% Subordinated Notes due 2027                
Debt Instrument [Line Items]                
Percentage of redemption price on principal       100.00%        
Trust preferred securities, face amount   $ 300,000            
Subordinated notes, interest rate   5.625%            
Net proceeds   $ 297,000            
5.625% Subordinated Notes due 2027 | LIBOR                
Debt Instrument [Line Items]                
Floating rate above three-month LIBOR rate   3.575%