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Borrowing Arrangements Narrative (Details)
 9 Months Ended
Sep. 30, 2023
USD ($)
credit_line
oustanding_letters_of_credit
Dec. 31, 2022
USD ($)
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) 2 years  
Securities sold under repurchase agreements $ 103,900,000 33,200,000
Federal Home Loan Bank borrowings, additional funding available 1,710,000,000  
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  
Comerica Bank    
Line of Credit Facility [Line Items]    
Line of credit, maximum borrowing capacity 7,500,000  
Federal Reserve Discount Window    
Line of Credit Facility [Line Items]    
Additional funding available 636,900,000  
Federal Reserve Bank Term Funding Program    
Line of Credit Facility [Line Items]    
Additional funding available $ 6,000  
Minimum    
Line of Credit Facility [Line Items]    
Federal Home Loan Bank borrowings interest rates 0.74%  
Federal Home Loan Bank borrowings maturities 20 days  
Maximum    
Line of Credit Facility [Line Items]    
Federal Home Loan Bank borrowings interest rates 4.80%  
Federal Home Loan Bank borrowings maturities 4 years 9 months 18 days  
Federal Reserve Discount Window    
Line of Credit Facility [Line Items]    
Other borrowings $ 0 $ 188,000,000
Federal Reserve Bank Term Funding Program    
Line of Credit Facility [Line Items]    
Other borrowings $ 291,300,000