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Borrowing Arrangements Narrative (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
oustanding_letters_of_credit
credit_line
Jun. 30, 2024
USD ($)
oustanding_letters_of_credit
credit_line
Dec. 31, 2023
USD ($)
Line of Credit Facility [Line Items]      
Number of credit lines maintained by the Company | credit_line 3 3  
Federal funds purchased $ 0 $ 0 $ 0
Letters of Credit, Federal Home Loan Bank, as collateral 0 $ 0  
Maturity of repurchase agreements (less than)   1 year 2 months 12 days  
Securities sold under repurchase agreements 88,000,000.0 $ 88,000,000.0 92,100,000
Federal Home Loan Bank borrowings, additional funding available 1,780,000,000 1,780,000,000  
Asset Pledged As Collateral, Excess Amount      
Line of Credit Facility [Line Items]      
Debt Securities 377,400,000 377,400,000 213,100,000
Frost Bank      
Line of Credit Facility [Line Items]      
Line of credit, maximum borrowing capacity 40,000,000.0 40,000,000.0  
Line of credit, capacity available for issuance of letters of credit $ 5,000,000.0 $ 5,000,000.0  
Number of outstanding letters of credit | oustanding_letters_of_credit 1 1  
Letters of Credit Outstanding, Amount $ 155,000 $ 155,000  
TIB - The Independent Bankers Bank      
Line of Credit Facility [Line Items]      
Line of credit, maximum borrowing capacity 15,000,000.0 15,000,000.0  
Amegy Bank      
Line of Credit Facility [Line Items]      
Line of credit, maximum borrowing capacity $ 25,000,000.0 $ 25,000,000.0  
Minimum      
Line of Credit Facility [Line Items]      
Federal Home Loan Bank borrowings interest rates 0.62% 0.62%  
Federal Home Loan Bank borrowings maturities   1 day  
Maximum      
Line of Credit Facility [Line Items]      
Federal Home Loan Bank borrowings interest rates 5.38% 5.38%  
Federal Home Loan Bank borrowings maturities   4 years  
Federal Reserve Discount Window      
Line of Credit Facility [Line Items]      
Other borrowings $ 0 $ 0 $ 300,000,000.0
Federal Reserve Bank Term Funding Program      
Line of Credit Facility [Line Items]      
Other borrowings $ 113,400,000 $ 113,400,000  
BTFP borrowings maturities (less than) 1 year