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Nature of Operations and Summary of Significant Accounting and Reporting Policies - Additional Information (Details)
 12 Months Ended
Dec. 31, 2024
USD ($)
Location
Segment
Classifications
shares
Dec. 31, 2023
shares
Dec. 31, 2022
shares
Summary of Accounting and Financial Policies [Line Items]      
Number of bank operating locations 283    
Number of Reportable Segments | Segment 1    
Number of Investment Securities Classifications | Classifications 2    
Minimum Percentage Likelihood of Tax Benefit to be Realized Upon Final Settlement 50.00%    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares 0 0 0
Number of options outstanding | shares 0    
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] srt:ChiefExecutiveOfficerMember    
Minimum [Member]      
Summary of Accounting and Financial Policies [Line Items]      
Property, Plant and Equipment, Useful Life 1 year    
Finite-lived intangible asset, useful life 10 years    
Maximum [Member]      
Summary of Accounting and Financial Policies [Line Items]      
Property, Plant and Equipment, Useful Life 39 years    
Finite-lived intangible asset, useful life 15 years    
Warehouse Purchase Program [Member]      
Summary of Accounting and Financial Policies [Line Items]      
Allowance for loan losses | $ $ 0    
Houston [Member]      
Summary of Accounting and Financial Policies [Line Items]      
Number of bank operating locations 65    
South Texas [Member]      
Summary of Accounting and Financial Policies [Line Items]      
Number of bank operating locations 30    
Dallas, Texas [Member]      
Summary of Accounting and Financial Policies [Line Items]      
Number of bank operating locations 62    
East Texas [Member]      
Summary of Accounting and Financial Policies [Line Items]      
Number of bank operating locations 22    
Central Texas [Member]      
Summary of Accounting and Financial Policies [Line Items]      
Number of bank operating locations 31    
West Texas [Member]      
Summary of Accounting and Financial Policies [Line Items]      
Number of bank operating locations 44    
Bryan/College Station [Member]      
Summary of Accounting and Financial Policies [Line Items]      
Number of bank operating locations 15    
Central Oklahoma [Member]      
Summary of Accounting and Financial Policies [Line Items]      
Number of bank operating locations 6    
Tulsa, Oklahoma [Member]      
Summary of Accounting and Financial Policies [Line Items]      
Number of bank operating locations 8