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Loans and Allowance for Credit Losses - Additional Information (Details)
12 Months Ended
May 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Asset
Dec. 31, 2022
USD ($)
Contract
Asset
Dec. 31, 2021
USD ($)
Asset
Mar. 31, 2023
USD ($)
Accounts Notes And Loans Receivable [Line Items]          
Loan purchase discounts   $ 27,900,000      
Loans held for sale   5,700,000      
Loans   $ 20,848,176,000 $ 18,558,251,000    
Percentage of Loans Related to Single Industry on Loans   10.00% 10.00%    
Percentage of real estate loans aggregating to company loan portfolio, excluding Warehouse Purchase Program loans   83.00% 80.30%    
Loans and Leases Receivable, Related Parties   $ 292,000 $ 547,000 $ 6,524,000  
Loans held for investment   $ 20,352,559,000 $ 18,098,653,000    
Financing Receivable Ratio of Nonperforming Loans to All Loans and Other Real Estate   0.34% 0.15% 0.15%  
Nonperforming assets, number of credits or other real estate properties | Asset   292      
Loans and leases receivable, nonaccrual loans   $ 68,700,000 $ 19,600,000 $ 26,300,000  
Financing Receivable, Allowance for Credit Losses on Loans   $ 332,400,000 $ 281,600,000    
Allowance for Credit Losses as Percentage of Loans   1.57% 1.49%    
Increase in allowance for credit losses for loans   $ (50,800,000)      
Increase in allowance for credit losses for loans, percentage   18.00%      
Provision for credit losses   $ 18,540,000 $ 0    
Provision for credit losses   11,984,000      
Net charge-offs   37,991,000 4,804,000 29,688,000  
Partial charge-offs of one commercial real estate loan   42,784,000 8,523,000 33,376,000  
General reserve $ 16,300,000 23,500,000      
Allowance for credit losses on off-balance sheet credit exposures   36,503,000 29,947,000 29,947,000  
Commitments expected to fund   2,340,000,000      
Nonaccrual loans   68,688,000 19,614,000    
Restructured loans charge-off     0    
First Bancshares of Texas, Inc. [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Loans         $ 1,650,000,000
Provision for credit losses   12,000,000      
Merger [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Net charge-offs   76,800,000      
Troubled Debt Restructuring [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Allowance for credit losses on off-balance sheet credit exposures   36,500,000 29,900,000    
Nonaccrual loans     4,600,000    
Troubled Debt Restructuring [Member] | First Bancshares of Texas, Inc. [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Provision for credit losses   6,500,000      
New Troubled Debt Restructuring [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Nonaccrual loans     3,824,000    
Financing receivable, modifications, recorded investment     $ 3,894,000    
Financing receivable, modifications, number of contract | Contract     2    
PCD Loans [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Net charge-offs   16,600,000      
Nonperforming Financial Instruments [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Loans held for investment   $ 72,700,000 $ 27,500,000 $ 28,100,000  
Nonperforming assets, number of credits or other real estate properties | Asset     170 157  
Warehouse Purchase Program [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Participation interest in mortgage loans acquired percentage   100.00%      
Commercial Real Estate (Includes Multi-Family Residential) [Member] | New Troubled Debt Restructuring [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Nonaccrual loans     $ 3,126,000    
Financing receivable, modifications, recorded investment     $ 3,144,000    
Financing receivable, modifications, number of contract | Contract     1    
Warehouse Purchase Program [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Loans   $ 822,200,000      
Loans held for investment   822,245,000 $ 740,620,000    
Commercial Real Estate Loan [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Net charge-offs   $ 15,000,000      
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Loan collateralized   89.00%      
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Loans held for investment   $ 5,662,948,000 4,986,211,000    
Provision for credit losses   14,216,000 (7,873,000) $ 5,424,000  
Net charge-offs   17,116,000 860,000 18,276,000  
Partial charge-offs of one commercial real estate loan   17,158,000 870,000 $ 18,408,000  
Nonaccrual loans   $ 18,662,000 $ 1,649,000    
Real Estate [Member] | FHA and VA Loans [Member] | 1-4 Family Residential (Includes Home Equity) [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Debt instrument, term   30 years      
Minimum [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Loan evaluation by loan concurrence officers   $ 1,000,000      
Minimum [Member] | Consumer Portfolio Segment [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Debt instrument, term   12 months      
Minimum [Member] | Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Debt instrument, term   5 years      
Minimum [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Debt instrument, term   15 years      
Maximum [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Loan evaluation by loan concurrence officers   $ 5,000,000      
Maximum [Member] | Consumer Portfolio Segment [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Debt instrument, term   180 months      
Maximum [Member] | Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Debt instrument, term   30 years      
Maximum [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Period of fixed interest   5 years      
Debt instrument, term   25 years