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BORROWING ARRANGEMENTS - Narrative (Details)
 12 Months Ended
Dec. 31, 2023
USD ($)
oustanding_letters_of_credit
credit_line
Dec. 31, 2022
USD ($)
Line of Credit Facility [Line Items]    
Number of credit lines maintained by the Company | credit_line 3  
Federal funds purchased $ 0 $ 0
FHLB borrowings, unused funds 1,950,000,000  
Letters of credit, FHLB, as collateral 0  
Securities sold under agreements to repurchase $ 92,100,000 33,200,000
Maturity of repurchase agreements, less than 2 years  
Federal Reserve Discount Window [Member]    
Line of Credit Facility [Line Items]    
Other borrowings $ 300,000,000 $ 188,000,000
Federal Reserve Bank Term Funding Program    
Line of Credit Facility [Line Items]    
Other borrowings $ 117,700,000  
maturity, less than 3 months  
Frost Bank    
Line of Credit Facility [Line Items]    
Line of credit, maximum borrowing capacity $ 40,000,000  
Line of credit facility, 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 [Member]    
Line of Credit Facility [Line Items]    
Additional Funding Available 213,100,000  
Federal Reserve Bank Term Funding Program    
Line of Credit Facility [Line Items]    
Additional Funding Available $ 8,000  
Minimum    
Line of Credit Facility [Line Items]    
FHLB borrowings, interest rate at period end 0.57%  
Maturity range of FHLB borrowings 22 days  
Maximum    
Line of Credit Facility [Line Items]    
FHLB borrowings, interest rate at period end 4.80%  
Maturity range of FHLB borrowings 4 years 6 months