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Subordinated Debentures - Additional Information (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 04, 2025
Jan. 18, 2022
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Jul. 31, 2025
Debt Instrument [Line Items]            
Subordinated debentures     $ 279,093   $ 439,246  
Repurchase gain     $ 1,882 $ 0    
2030 Notes            
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%      
Trust preferred securities, face amount   $ 300,000        
Subordinated notes, Interest rate   3.125%        
Net proceeds   $ 296,400        
Company repurchased $ 20,000          
Repurchase gain $ 1,900          
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      
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]            
Subordinated debentures     $ 0   $ 140,764 $ 140,000
Fixed rate for first five years     5.50%   5.50% 5.50%
Percentage of redemption price on principal           100.00%
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]            
Subordinated debentures     $ 279,093   $ 298,482  
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%