LOANS HELD FOR INVESTMENT - Amortized Cost Basis of Loans Modified to Borrowers Experiencing Financial Difficulty and Financial Effects of Loan Modifications (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
LOANS HELD FOR INVESTMENT [Abstract]
% of total class of financing receivable	0.04%	0.02%	0.07%	0.03%
Nonaccrual	$ 1,569	$ 1,245	$ 1,569	$ 1,245
Other consumer	0.04%	0.02%	0.07%	0.03%
Payment Delay [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	$ 537	$ 44	$ 1,008	$ 44
Term Extension [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	577	0	626	260
Rate Reduction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	0	0	0
Term Extension and Payment Delay [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	262	634	1,096	677
Payment Delay, Term Extension, and Interest Rate Reduction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	13	0	13
Current [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	1,550	1,447	1,550	1,447
30-89 Days Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	0	345	0	345
90 Days or More Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	$ 45	$ 87	$ 45	$ 87
Commercial Real Estate [Member]
LOANS HELD FOR INVESTMENT [Abstract]
% of total class of financing receivable	0.02%	0.00%	0.02%	0.00%
Weighted-average interest rate reduction	0.00%	0.00%	0.00%	0.00%
Weighted-average term extension	13 years		13 years
Nonaccrual	$ 0	$ 150	$ 0	$ 150
Other consumer	0.00%	0.00%	0.00%	0.00%
Other consumer	0.02%	0.00%	0.02%	0.00%
Commercial Real Estate [Member] | Payment Delay [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	$ 0	$ 0	$ 0	$ 0
Commercial Real Estate [Member] | Term Extension [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	0	0	0
Commercial Real Estate [Member] | Rate Reduction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	0	0	0
Commercial Real Estate [Member] | Term Extension and Payment Delay [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	250	0	250	0
Commercial Real Estate [Member] | Payment Delay, Term Extension, and Interest Rate Reduction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	0	0	0
Commercial Real Estate [Member] | Current [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	250	63	250	63
Commercial Real Estate [Member] | 30-89 Days Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	0	45	0	45
Commercial Real Estate [Member] | 90 Days or More Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	$ 0	$ 27	$ 0	$ 27
Commercial [Member] | Specialized [Member]
LOANS HELD FOR INVESTMENT [Abstract]
% of total class of financing receivable	0.04%	0.01%	0.15%	0.01%
Weighted-average interest rate reduction	0.00%	0.00%	0.00%	0.00%
Weighted-average term extension		14 years		14 years
Nonaccrual	$ 456	$ 0	$ 456	$ 0
Other consumer	0.00%	0.00%	0.00%	0.00%
Other consumer	0.04%	0.01%	0.15%	0.01%
Commercial [Member] | Specialized [Member] | Payment Delay [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	$ 174	$ 0	$ 630	$ 0
Commercial [Member] | Specialized [Member] | Term Extension [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	0	0	0
Commercial [Member] | Specialized [Member] | Rate Reduction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	0	0	0
Commercial [Member] | Specialized [Member] | Term Extension and Payment Delay [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	38	0	38
Commercial [Member] | Specialized [Member] | Payment Delay, Term Extension, and Interest Rate Reduction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	0	0	0
Commercial [Member] | Specialized [Member] | Current [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	174	0	174	0
Commercial [Member] | Specialized [Member] | 30-89 Days Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	0	38	0	38
Commercial [Member] | Specialized [Member] | 90 Days or More Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	$ 0	$ 0	$ 0	$ 0
Commercial [Member] | General [Member]
LOANS HELD FOR INVESTMENT [Abstract]
% of total class of financing receivable	0.05%	0.01%	0.06%	0.06%
Weighted-average interest rate reduction	0.00%	1.00%	1.00%	1.00%
Weighted-average term extension	6 years	40 years	7 years	36 years
Nonaccrual	$ 382	$ 139	$ 382	$ 139
Other consumer	0.00%	1.00%	1.00%	1.00%
Other consumer	0.05%	0.01%	0.06%	0.06%
Commercial [Member] | General [Member] | Payment Delay [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	$ 363	$ 0	$ 378	$ 0
Commercial [Member] | General [Member] | Term Extension [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	48	0	67	260
Commercial [Member] | General [Member] | Rate Reduction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	0	0	0
Commercial [Member] | General [Member] | Term Extension and Payment Delay [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	12	50	12	93
Commercial [Member] | General [Member] | Payment Delay, Term Extension, and Interest Rate Reduction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	10	0	10
Commercial [Member] | General [Member] | Current [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	468	605	468	605
Commercial [Member] | General [Member] | 30-89 Days Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	0	0	0	0
Commercial [Member] | General [Member] | 90 Days or More Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	$ 15	$ 0	$ 15	$ 0
Consumer [Member] | 1-4 Family Residential [Member]
LOANS HELD FOR INVESTMENT [Abstract]
% of total class of financing receivable	0.00%	0.00%	0.04%	0.00%
Weighted-average interest rate reduction	0.00%	0.00%	0.00%	0.00%
Weighted-average term extension			45 years
Nonaccrual	$ 133	$ 815	$ 133	$ 815
Other consumer	0.00%	0.00%	0.00%	0.00%
Other consumer	0.00%	0.00%	0.04%	0.00%
Consumer [Member] | 1-4 Family Residential [Member] | Payment Delay [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	$ 0	$ 0	$ 0	$ 0
Consumer [Member] | 1-4 Family Residential [Member] | Term Extension [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	0	30	0
Consumer [Member] | 1-4 Family Residential [Member] | Rate Reduction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	0	0	0
Consumer [Member] | 1-4 Family Residential [Member] | Term Extension and Payment Delay [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	0	236	0
Consumer [Member] | 1-4 Family Residential [Member] | Payment Delay, Term Extension, and Interest Rate Reduction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	0	0	0
Consumer [Member] | 1-4 Family Residential [Member] | Current [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	103	185	103	185
Consumer [Member] | 1-4 Family Residential [Member] | 30-89 Days Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	0	262	0	262
Consumer [Member] | 1-4 Family Residential [Member] | 90 Days or More Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	$ 30	$ 60	$ 30	$ 60
Consumer [Member] | Auto Loans [Member]
LOANS HELD FOR INVESTMENT [Abstract]
% of total class of financing receivable	0.00%	0.02%	0.00%	0.02%
Weighted-average interest rate reduction	0.00%	1.20%	1.20%	1.20%
Weighted-average term extension		50 years		50 years
Nonaccrual	$ 0	$ 0	$ 0	$ 0
Other consumer	0.00%	1.20%	1.20%	1.20%
Other consumer	0.00%	0.02%	0.00%	0.02%
Consumer [Member] | Auto Loans [Member] | Payment Delay [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	$ 0	$ 44	$ 0	$ 44
Consumer [Member] | Auto Loans [Member] | Term Extension [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	0	0	0
Consumer [Member] | Auto Loans [Member] | Rate Reduction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	0	0	0
Consumer [Member] | Auto Loans [Member] | Term Extension and Payment Delay [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	0	0	0
Consumer [Member] | Auto Loans [Member] | Payment Delay, Term Extension, and Interest Rate Reduction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	3	0	3
Consumer [Member] | Auto Loans [Member] | Current [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	26	48	26	48
Consumer [Member] | Auto Loans [Member] | 30-89 Days Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	0	0	0	0
Consumer [Member] | Auto Loans [Member] | 90 Days or More Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	$ 0	$ 0	$ 0	$ 0
Consumer [Member] | Other Consumer [Member]
LOANS HELD FOR INVESTMENT [Abstract]
% of total class of financing receivable	0.00%	0.03%	0.00%	0.03%
Weighted-average interest rate reduction	0.00%	0.00%	0.00%	0.00%
Weighted-average term extension		5 years		5 years
Nonaccrual	$ 0	$ 0	$ 0	$ 0
Other consumer	0.00%	0.00%	0.00%	0.00%
Other consumer	0.00%	0.03%	0.00%	0.03%
Consumer [Member] | Other Consumer [Member] | Payment Delay [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	$ 0	$ 0		$ 0
Consumer [Member] | Other Consumer [Member] | Term Extension [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	0		0
Consumer [Member] | Other Consumer [Member] | Rate Reduction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	0		0
Consumer [Member] | Other Consumer [Member] | Term Extension and Payment Delay [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	17		17
Consumer [Member] | Other Consumer [Member] | Payment Delay, Term Extension, and Interest Rate Reduction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	0		0
Consumer [Member] | Other Consumer [Member] | Current [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	0	17	$ 0	17
Consumer [Member] | Other Consumer [Member] | 30-89 Days Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	0	0	0	0
Consumer [Member] | Other Consumer [Member] | 90 Days or More Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	$ 0	$ 0	$ 0	$ 0
Construction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
% of total class of financing receivable	0.37%	0.52%	0.79%	0.52%
Weighted-average interest rate reduction	0.00%	0.00%	0.00%	0.00%
Weighted-average term extension	61 years	3 years	35 years	3 years
Nonaccrual	$ 598	$ 141	$ 598	$ 141
Other consumer	0.00%	0.00%	0.00%	0.00%
Other consumer	0.37%	0.52%	0.79%	0.52%
Construction [Member] | Payment Delay [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	$ 0	$ 0	$ 0	$ 0
Construction [Member] | Term Extension [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	529	0	529	0
Construction [Member] | Rate Reduction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	0	0	0
Construction [Member] | Term Extension and Payment Delay [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	529	598	529
Construction [Member] | Payment Delay, Term Extension, and Interest Rate Reduction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans modified	0	0	0	0
Construction [Member] | Current [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	529	529	529	529
Construction [Member] | 30-89 Days Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	0	0	0	0
Construction [Member] | 90 Days or More Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loan modified	$ 0	$ 0	$ 0	$ 0