LOANS HELD FOR INVESTMENT - Summary of Loans Held for Investment by Category (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Jun. 30, 2026	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024
LOANS HELD FOR INVESTMENT [Abstract]
Loans, gross	$ 3,831,138		$ 3,144,502
Allowance for credit losses on loans	(52,768)	$ (53,076)	(45,131)	$ (44,125)	$ (45,010)	$ (43,237)
Loans held for investment, net	3,778,370		3,099,371
Commercial Real Estate [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans, gross	1,364,396		1,064,625
Allowance for credit losses on loans	(18,200)	(18,328)	(15,214)	(14,937)	(15,706)	(15,973)
Construction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans, gross	153,713		100,103
Allowance for credit losses on loans	(2,648)	(2,382)	(1,952)	(1,901)	(1,948)	(1,943)
Specialized [Member] \| Commercial [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans, gross	435,051		409,351
Allowance for credit losses on loans	(5,703)	(5,613)	(5,231)	(4,809)	(4,881)	(4,640)
General [Member] \| Commercial [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans, gross	835,328		659,323
Allowance for credit losses on loans	(8,761)	(8,590)	(7,448)	(7,248)	(7,228)	(6,874)
1-4 Family Residential [Member] \| Consumer [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans, gross	711,700		589,851
Allowance for credit losses on loans	(12,859)	(13,594)	(11,103)	(11,080)	(11,150)	(9,677)
Auto Loans [Member] \| Consumer [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans, gross	270,688		259,157
Allowance for credit losses on loans	(3,495)	(3,449)	(3,033)	(2,966)	(2,995)	(3,015)
Other Consumer [Member] \| Consumer [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Loans, gross	60,262		62,092
Allowance for credit losses on loans	$ (1,102)	$ (1,120)	$ (1,150)	$ (1,184)	$ (1,102)	$ (1,115)