LOANS HELD FOR INVESTMENT - Summary of Loans Held for Investment by Category (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
LOANS HELD FOR INVESTMENT [Abstract]
Loans, gross	$ 3,103,529	$ 3,144,502
Allowance for credit losses on loans	(44,822)	(45,131)	$ (42,968)	$ (43,237)
Loans held for investment, net	3,058,707	3,099,371
Commercial Real Estate [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans, gross	1,052,951	1,064,625
Allowance for credit losses on loans	(15,017)	(15,214)	(15,787)	(15,973)
Construction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans, gross	103,444	100,103
Allowance for credit losses on loans	(1,912)	(1,952)	(1,973)	(1,943)
Specialized [Member] \| Commercial [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans, gross	384,861	409,351
Allowance for credit losses on loans	(5,351)	(5,231)	(4,523)	(4,640)
General [Member] \| Commercial [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans, gross	654,634	659,323
Allowance for credit losses on loans	(7,384)	(7,448)	(6,403)	(6,874)
1-4 Family Residential [Member] \| Consumer [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans, gross	589,026	589,851
Allowance for credit losses on loans	(10,803)	(11,103)	(10,079)	(9,677)
Auto Loans [Member] \| Consumer [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans, gross	256,056	259,157
Allowance for credit losses on loans	(3,298)	(3,033)	(3,096)	(3,015)
Other Consumer [Member] \| Consumer [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans, gross	62,557	62,092
Allowance for credit losses on loans	$ (1,057)	$ (1,150)	$ (1,107)	$ (1,115)