LOANS HELD FOR INVESTMENT - Age Analysis on Accruing Past-due Loans and Nonaccrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	$ 3,771,434	$ 3,144,502
Total Nonaccrual	6,857	7,070
Nonaccrual with no ACL	1,546	598
30-89 Days Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	8,794	6,514
90 Days or More Past Due and Still Accruing [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	2,650	2,735
Commercial Real Estate [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	1,332,520	1,064,625
Total Nonaccrual	1,922	1,402
Nonaccrual with no ACL	0	54
Commercial Real Estate [Member] | 30-89 Days Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	4,726	2,241
Commercial Real Estate [Member] | 90 Days or More Past Due and Still Accruing [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	213	206
Commercial [Member] | Specialized [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	429,380	409,351
Total Nonaccrual	695	699
Nonaccrual with no ACL	0	544
Commercial [Member] | Specialized [Member] | 30-89 Days Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	18	264
Commercial [Member] | Specialized [Member] | 90 Days or More Past Due and Still Accruing [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	0	50
Commercial [Member] | General [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	827,452	659,323
Total Nonaccrual	491	4,108
Nonaccrual with no ACL	363	0
Commercial [Member] | General [Member] | 30-89 Days Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	1,157	1,173
Commercial [Member] | General [Member] | 90 Days or More Past Due and Still Accruing [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	127	31
Consumer [Member] | 1-4 Family Residential [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	714,014	589,851
Total Nonaccrual	3,139	845
Nonaccrual with no ACL	585	0
Consumer [Member] | 1-4 Family Residential [Member] | 30-89 Days Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	1,793	1,221
Consumer [Member] | 1-4 Family Residential [Member] | 90 Days or More Past Due and Still Accruing [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	2,131	1,750
Consumer [Member] | Auto Loans [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	263,810	259,157
Total Nonaccrual	0	0
Nonaccrual with no ACL	0	0
Consumer [Member] | Auto Loans [Member] | 30-89 Days Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	569	395
Consumer [Member] | Auto Loans [Member] | 90 Days or More Past Due and Still Accruing [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	40	40
Consumer [Member] | Other Consumer [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	61,060	62,092
Total Nonaccrual	12	16
Nonaccrual with no ACL	0	0
Consumer [Member] | Other Consumer [Member] | 30-89 Days Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	531	765
Consumer [Member] | Other Consumer [Member] | 90 Days or More Past Due and Still Accruing [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	36	80
Construction [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	143,198	100,103
Total Nonaccrual	598	0
Nonaccrual with no ACL	598	0
Construction [Member] | 30-89 Days Past Due [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	0	455
Construction [Member] | 90 Days or More Past Due and Still Accruing [Member]
LOANS HELD FOR INVESTMENT [Abstract]
Past Due	$ 103	$ 578