LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Age Analysis of Past Due Loans, Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 17,492,179	$ 17,005,937
90 Days Past Due & Accruing	948	603
Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	65,210	48,196
90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	83,345	81,698
Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	148,555	129,894
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	17,343,624	16,876,043
Consumer:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	291,232	308,994
90 Days Past Due & Accruing	697	529
Consumer: | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	3,487	3,576
Consumer: | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	917	1,016
Consumer: | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	4,404	4,592
Consumer: | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	286,828	304,402
Consumer: | Credit cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	175,760	181,675
90 Days Past Due & Accruing	697	529
Consumer: | Credit cards | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,414	1,824
Consumer: | Credit cards | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	751	635
Consumer: | Credit cards | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	3,165	2,459
Consumer: | Credit cards | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	172,595	179,216
Consumer: | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	115,472	127,319
90 Days Past Due & Accruing	0	0
Consumer: | Other consumer | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,073	1,752
Consumer: | Other consumer | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	166	381
Consumer: | Other consumer | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,239	2,133
Consumer: | Other consumer | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	114,233	125,186
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	13,771,225	13,391,531
90 Days Past Due & Accruing	148	0
Real Estate | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	58,954	40,416
Real Estate | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	71,155	53,516
Real Estate | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	130,109	93,932
Real Estate | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	13,641,116	13,297,599
Real Estate | Construction and development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,873,807	2,789,249
90 Days Past Due & Accruing	0	0
Real Estate | Construction and development | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	13,344	332
Real Estate | Construction and development | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	17,418	10,530
Real Estate | Construction and development | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	30,762	10,862
Real Estate | Construction and development | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,843,045	2,778,387
Real Estate | Single family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,607,450	2,689,946
90 Days Past Due & Accruing	0	0
Real Estate | Single family residential | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	34,731	34,651
Real Estate | Single family residential | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	15,690	16,013
Real Estate | Single family residential | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	50,421	50,664
Real Estate | Single family residential | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,557,029	2,639,282
Real Estate | Other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	8,289,968	7,912,336
90 Days Past Due & Accruing	148	0
Real Estate | Other commercial | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	10,879	5,433
Real Estate | Other commercial | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	38,047	26,973
Real Estate | Other commercial | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	48,926	32,406
Real Estate | Other commercial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	8,241,042	7,879,930
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,688,639	2,695,329
90 Days Past Due & Accruing	103	74
Commercial | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,769	3,928
Commercial | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	11,270	27,163
Commercial | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	14,039	31,091
Commercial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,674,600	2,664,238
Commercial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,382,339	2,434,175
90 Days Past Due & Accruing	103	74
Commercial | Commercial | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,755	3,535
Commercial | Commercial | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	10,672	27,059
Commercial | Commercial | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	13,427	30,594
Commercial | Commercial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,368,912	2,403,581
Commercial | Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	306,300	261,154
90 Days Past Due & Accruing	0	0
Commercial | Agricultural | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	14	393
Commercial | Agricultural | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	598	104
Commercial | Agricultural | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	612	497
Commercial | Agricultural | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	305,688	260,657
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	741,083	610,083
90 Days Past Due & Accruing	0	0
Other | Gross 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	0	276
Other | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	3	3
Other | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	3	279
Other | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 741,080	$ 609,804