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Borrowing Arrangements Narrative (Details)
 6 Months Ended
Jun. 30, 2022
USD ($)
oustanding_letters_of_credit
credit_line
Dec. 31, 2021
USD ($)
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  
Securities sold under repurchase agreements $ 29,500,000 23,200,000
Federal Home Loan Bank borrowings, additional funding available 1,730,000,000  
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 $ 391,100,000  
Minimum    
Line of Credit Facility [Line Items]    
Federal Home Loan Bank borrowings interest rates 1.72%  
Federal Home Loan Bank borrowings maturities 22 days  
Maximum    
Line of Credit Facility [Line Items]    
Federal Home Loan Bank borrowings interest rates 4.799%  
Federal Home Loan Bank borrowings maturities 6 years  
Federal Reserve Discount Window    
Line of Credit Facility [Line Items]    
Other borrowings $ 29,000,000 $ 0