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Allowance for Credit Losses, Credit Quality and Other - Additional Information (Detail)
 12 Months Ended
Jun. 30, 2022
USD ($)
Dec. 31, 2023
USD ($)
loan
Dec. 31, 2022
USD ($)
contract
loan
Dec. 31, 2021
USD ($)
Apr. 01, 2022
USD ($)
Dec. 31, 2020
USD ($)
Financing Receivable Allowance For Credit Losses [Line Items]            
Provision for credit losses on loans   $ 11,950,000 $ 50,170,000 $ 0    
Provision for unfunded commitments   (1,500,000) 11,410,000 (4,752,000)    
Allowance for credit losses on PCD loans     16,816,000      
Non-accrual loans   59,971,000 51,011,000      
Loans past due over 90 days still accruing   4,130,000 9,845,000      
Nonaccrual loans with specific reserve   2,500,000 8,400,000      
Interest income on nonaccrual loans   0 0 0    
Collateral-dependent impaired loans   94,900,000 221,100,000      
Interest recognized on impaired loans   2,500,000 9,600,000 14,700,000    
Amount of loan assessed for impairment on a quarterly basis   2,000,000        
Revolver loans converted to term loans   $ 69,000,000 $ 28,300,000      
Number of revolving loans convert to term loans | loan   217 183      
Restructured loans, amount   $ 19,500,000 $ 11,140,000      
Number of loans   21 44      
Loans, ending balance   $ 21,000,000        
Post modification outstanding balance   24,610,000 $ 5,745,000      
Loan balance, nonaccrual   905,000        
Allowance for credit loss   $ 288,234,000 289,669,000 236,714,000   $ 245,473,000
Three Modified Loans            
Financing Receivable Allowance For Credit Losses [Line Items]            
Number of loans | loan   3        
Post modification outstanding balance   $ 18,200,000        
Two Modified Loans | Extended Maturity, Interest Only Payments And Interest Rate Increase            
Financing Receivable Allowance For Credit Losses [Line Items]            
Number of loans | loan   2        
Interest only payments, term   36 months        
Term extension   36 months        
Increase in interest rate   0.0009        
One Modified Loan | Extended Maturity And Interest Rate Increase            
Financing Receivable Allowance For Credit Losses [Line Items]            
Term extension   49 months        
Increase in interest rate   3.45        
Increased Loan Growth            
Financing Receivable Allowance For Credit Losses [Line Items]            
Provision for credit losses on loans     5,000,000      
Deteriorated Credit Quality | Cumulative Effect Period of Adoption Adjustment | Accounting Standards Update 2016-13            
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for credit loss   $ 130,700,000 142,500,000      
Happy Bancshares, Inc.            
Financing Receivable Allowance For Credit Losses [Line Items]            
Provision for credit losses on loans $ (1,500,000) 12,000,000 11,400,000      
Net loan discounts (4,400,000)          
Allowance for credit losses $ 16,816,000   16,800,000   $ 42,224,000  
Provision for credit losses     45,200,000      
Happy Bancshares, Inc. | Deteriorated Credit Quality | Cumulative Effect Period of Adoption Adjustment | Accounting Standards Update 2016-13            
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for credit loss   130,400,000 142,100,000      
LH-Finance | Deteriorated Credit Quality | Cumulative Effect Period of Adoption Adjustment | Accounting Standards Update 2016-13            
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for credit loss   376,100 415,000      
Non-current Loans            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loans, ending balance   20,100,000        
Loans Past Due 60-89 Days            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loans, ending balance   $ 1,500,000        
Construction / Land Development and Other Commercial Real Estate Loans | Minimum            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loans collateralized by first liens on real estate amortized period   15 years        
Loans collateralized by first liens on real estate balloon payments due period   1 year        
Construction / Land Development and Other Commercial Real Estate Loans | Maximum            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loans collateralized by first liens on real estate amortized period   30 years        
Loans collateralized by first liens on real estate balloon payments due period   5 years        
Percentage of loan value of improved property   85.00%        
Percentage of loan value of raw land   65.00%        
Percentage of loan value of land to be acquired and developed   75.00%        
Residential Real Estate            
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for credit losses on PCD loans     980,000      
Allowance for credit loss   $ 55,860,000 50,963,000 48,458,000   53,216,000
Residential Real Estate | Maximum            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loan-to-value ratio   90.00%        
Commercial and Industrial Loans            
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for credit losses on PCD loans     5,596,000      
Non-accrual loans   $ 9,982,000 14,920,000      
Loans past due over 90 days still accruing   1,535,000 6,300,000      
Restructured loans, amount     $ 3,199,000      
Number of loans | contract     15      
Post modification outstanding balance   4,170,000 $ 951,000      
Allowance for credit loss   $ 92,810,000 89,354,000 $ 53,062,000   $ 46,530,000
Commercial and Industrial Loans | Minimum            
Financing Receivable Allowance For Credit Losses [Line Items]            
Commercial loans terms   1 year        
Inventory financing percentage   50.00%        
Commercial and Industrial Loans | Minimum | Accounts Receivable Less than 60 Days Past Due            
Financing Receivable Allowance For Credit Losses [Line Items]            
Accounts receivable financed percentage   50.00%        
Commercial and Industrial Loans | Maximum            
Financing Receivable Allowance For Credit Losses [Line Items]            
Commercial loans terms   7 years        
Inventory financing percentage   80.00%        
Commercial and Industrial Loans | Maximum | Accounts Receivable Less than 60 Days Past Due            
Financing Receivable Allowance For Credit Losses [Line Items]            
Accounts receivable financed percentage   80.00%        
Total real estate            
Financing Receivable Allowance For Credit Losses [Line Items]            
Non-accrual loans   $ 46,054,000 32,557,000      
Loans past due over 90 days still accruing   2,516,000 3,249,000      
Restructured loans, amount     $ 7,923,000      
Number of loans | contract     27      
Post modification outstanding balance   $ 20,410,000 $ 4,782,000