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Subordinated Debentures - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jan. 18, 2022
Mar. 31, 2025
Dec. 31, 2024
Apr. 01, 2022
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 $ 300.0      
Subordinated notes, Interest rate 3.125%      
Net proceeds $ 296.4      
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   $ 144.4   $ 140.0
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 | 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 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%  
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%