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BORROWING ARRANGEMENTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 08, 2023
Dec. 31, 2025
Sep. 30, 2025
Dec. 31, 2024
Sep. 29, 2020
Dec. 31, 2018
BORROWING ARRANGEMENTS [Abstract]            
Carrying amount of FHLB stock   $ 2,200   $ 3,100    
FHLB stock, available borrowing capacity   1,300,000   1,100,000    
Outstanding borrowings   0   0    
Subordinated debt   14,100   63,961    
Trust Preferred Securities [Member]            
BORROWING ARRANGEMENTS [Abstract]            
Common capital securities issued by the trusts   $ 1,400        
Debentures and Trust Preferred Securities [Member] | Maximum [Member]            
BORROWING ARRANGEMENTS [Abstract]            
Number of consecutive years during which interest can be deferred   5 years        
Period after issue date when debt securities may be redeemed   5 years        
Federal Home Loan Bank Advances [Member] | Federal Home Loan Bank of Dallas [Member] | Bank Subsidiary [Member]            
BORROWING ARRANGEMENTS [Abstract]            
Original amount of advances   $ 0   0    
Subordinated Debt [Member]            
BORROWING ARRANGEMENTS [Abstract]            
Debt instrument, face amount     $ 14,100 64,100    
Debt issuance cost       139    
Subordinated debt       64,000    
Subordinated Debt [Member] | Subordinated Debt Securities Issued in December 2018 [Member]            
BORROWING ARRANGEMENTS [Abstract]            
Debt instrument, face amount           $ 26,500
Subordinated Debt [Member] | Subordinated Debt Securities Issued in September 29, 2020 [Member]            
BORROWING ARRANGEMENTS [Abstract]            
Debt instrument, face amount         $ 50,000  
Debt instrument, maturity date   Sep. 30, 2030        
Debt instrument, period of fixed interest rate   5 years        
Debt issuance cost         $ 926  
Debt instrument, initial interest rate         4.50%  
Debt Instrument, Repurchase Date   Sep. 30, 2025        
Debt Instrument, Repurchased Face Amount     $ 50,000      
Subordinated Debt [Member] | Debt Securities One [Member] | Subordinated Debt Securities Issued in December 2018 [Member]            
BORROWING ARRANGEMENTS [Abstract]            
Debt instrument, face amount $ 12,400         $ 12,400
Debt instrument, maturity date Dec. 15, 2023 Dec. 31, 2028        
Debt instrument, weighted average interest rate           5.74%
Debt instrument, period of fixed interest rate   5 years        
Debt instrument, variable interest rate, floor   4.00%        
Debt instrument, variable interest rate, ceiling   7.50%        
Subordinated Debt [Member] | Debt Securities One [Member] | Subordinated Debt Securities Issued in December 2018 [Member] | Maximum [Member]            
BORROWING ARRANGEMENTS [Abstract]            
Remaining maturity period during which debt can be called   5 years        
Subordinated Debt [Member] | Debt Securities Two [Member] | Subordinated Debt Securities Issued in December 2018 [Member]            
BORROWING ARRANGEMENTS [Abstract]            
Debt instrument, face amount           $ 14,100
Debt instrument, maturity date   Dec. 31, 2030        
Debt instrument, weighted average interest rate           6.41%
Debt instrument, period of fixed interest rate   7 years        
Debt instrument, variable interest rate, floor   4.00%        
Debt instrument, variable interest rate, ceiling   7.50%        
Subordinated Debt [Member] | Debt Securities Two [Member] | Subordinated Debt Securities Issued in December 2018 [Member] | Maximum [Member]            
BORROWING ARRANGEMENTS [Abstract]            
Remaining maturity period during which debt can be called   5 years        
Bank Subsidiary [Member] | Federal Reserve Bank of Dallas (FRB) [Member]            
BORROWING ARRANGEMENTS [Abstract]            
Line of credit, current borrowing capacity   $ 659,700   654,000    
Bank Subsidiary [Member] | Multiple Banks [Member]            
BORROWING ARRANGEMENTS [Abstract]            
Line of credit, current borrowing capacity   140,000   140,000    
Federal Funds Purchased [Member]            
BORROWING ARRANGEMENTS [Abstract]            
Short-term borrowings   $ 0   0    
Short-term borrowings, maturity period   1 day        
Federal Home Loan Bank Advances [Member]            
BORROWING ARRANGEMENTS [Abstract]            
Short-term borrowings   $ 0   $ 0