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Borrowing Arrangements Narrative (Details)
 3 Months Ended
Mar. 31, 2024
USD ($)
credit_line
oustanding_letters_of_credit
Dec. 31, 2023
USD ($)
Line of Credit Facility [Line Items]    
Number of credit lines maintained by the Company | credit_line 3  
Federal funds purchased $ 0 $ 0
Letters of Credit, Federal Home Loan Bank, as collateral $ 0  
Maturity of repurchase agreements (less than) 1 year 4 months 24 days  
Securities sold under repurchase agreements $ 91,600,000 92,100,000
Federal Home Loan Bank borrowings, additional funding available 2,010,000,000.00  
Asset Pledged As Collateral, Excess Amount    
Line of Credit Facility [Line Items]    
Debt Securities 251,900,000 213,100,000
Frost Bank    
Line of Credit Facility [Line Items]    
Line of credit, maximum borrowing capacity 40,000,000  
Line of credit, capacity available for issuance of letters of credit $ 5,000,000  
Number of outstanding letters of credit | oustanding_letters_of_credit 1  
Letters of Credit Outstanding, Amount $ 155,000  
TIB - The Independent Bankers Bank    
Line of Credit Facility [Line Items]    
Line of credit, maximum borrowing capacity 15,000,000  
Amegy Bank    
Line of Credit Facility [Line Items]    
Line of credit, maximum borrowing capacity $ 25,000,000  
Minimum    
Line of Credit Facility [Line Items]    
Federal Home Loan Bank borrowings interest rates 0.61%  
Federal Home Loan Bank borrowings maturities 1 day  
Maximum    
Line of Credit Facility [Line Items]    
Federal Home Loan Bank borrowings interest rates 4.80%  
Federal Home Loan Bank borrowings maturities 4 years 3 months 18 days  
Federal Reserve Discount Window    
Line of Credit Facility [Line Items]    
Other borrowings $ 250,000,000 $ 300,000,000
Federal Reserve Bank Term Funding Program    
Line of Credit Facility [Line Items]    
Other borrowings $ 116,100,000  
LineOfCreditFacilityMaturity 1 year