LOANS HELD FOR INVESTMENT - Age Analysis on Accruing Past-due Loans and Nonaccrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	$ 3,053,503	$ 3,055,054
Total Nonaccrual	8,496	22,102
Nonaccrual with no ACL	3,422	1,575
Commercial Real Estate [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	1,035,926	1,119,063
Total Nonaccrual	3,179	19,543
Nonaccrual with no ACL	3,179	0
Construction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	97,952	103,855
Total Nonaccrual	141	1,575
Nonaccrual with no ACL	141	1,575
Specialized [Member] | Commercial [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	377,783	388,955
Total Nonaccrual	167	105
Nonaccrual with no ACL	0	0
General [Member] | Commercial [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	629,256	557,371
Total Nonaccrual	4,109	180
Nonaccrual with no ACL	0	0
1-4 Family Residential [Member] | Commercial [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Total Nonaccrual	883	676
Nonaccrual with no ACL	102	0
Auto Loans [Member] | Commercial [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Total Nonaccrual	0	0
Nonaccrual with no ACL	0	0
Other Consumer [Member] | Commercial [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Total Nonaccrual	17	23
Nonaccrual with no ACL	0	0
30-89 Days Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	4,994	7,928
30-89 Days Past Due [Member] | Commercial Real Estate [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	226	594
30-89 Days Past Due [Member] | Construction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	529	95
30-89 Days Past Due [Member] | Specialized [Member] | Commercial [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	0	1,770
30-89 Days Past Due [Member] | General [Member] | Commercial [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	780	1,374
30-89 Days Past Due [Member] | 1-4 Family Residential [Member] | Commercial [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	2,429	1,966
30-89 Days Past Due [Member] | Auto Loans [Member] | Commercial [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	408	1,004
30-89 Days Past Due [Member] | Other Consumer [Member] | Commercial [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	622	1,125
90 Days or More Past Due and Still Accruing [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	1,213	1,921
90 Days or More Past Due and Still Accruing [Member] | Commercial Real Estate [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	46	96
90 Days or More Past Due and Still Accruing [Member] | Construction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	0	0
90 Days or More Past Due and Still Accruing [Member] | Specialized [Member] | Commercial [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	0	240
90 Days or More Past Due and Still Accruing [Member] | General [Member] | Commercial [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	28	244
90 Days or More Past Due and Still Accruing [Member] | 1-4 Family Residential [Member] | Commercial [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	882	1,042
90 Days or More Past Due and Still Accruing [Member] | Auto Loans [Member] | Commercial [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	163	114
90 Days or More Past Due and Still Accruing [Member] | Other Consumer [Member] | Commercial [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	$ 94	$ 185