LOANS AND ALLOWANCE FOR CREDIT LOSSES - Past Due Aging of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Loans	$ 12,646,808	$ 12,486,027
Loans > 90 Days or More Past Due And Accruing	14,105	172
Current
Financing Receivable, Past Due [Line Items]
Loans	12,551,804	12,406,783
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	30,287	34,075
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	18,773	11,189
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	45,944	33,980
Commercial and industrial loans
Financing Receivable, Past Due [Line Items]
Loans	4,041,217	3,670,948
Loans > 90 Days or More Past Due And Accruing	930	86
Commercial and industrial loans | Current
Financing Receivable, Past Due [Line Items]
Loans	4,023,016	3,657,447
Commercial and industrial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,906	5,021
Commercial and industrial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	7,805	1,622
Commercial and industrial loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	8,490	6,858
Agricultural land, production and other loans to farmers
Financing Receivable, Past Due [Line Items]
Loans	238,743	263,414
Loans > 90 Days or More Past Due And Accruing	0	0
Agricultural land, production and other loans to farmers | Current
Financing Receivable, Past Due [Line Items]
Loans	238,221	263,414
Agricultural land, production and other loans to farmers | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	522	0
Agricultural land, production and other loans to farmers | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Agricultural land, production and other loans to farmers | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Construction
Financing Receivable, Past Due [Line Items]
Loans	814,704	957,545
Loans > 90 Days or More Past Due And Accruing	0	0
Construction | Current
Financing Receivable, Past Due [Line Items]
Loans	810,536	955,588
Construction | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	2,522	0
Construction | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,646	1,957
Construction | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial real estate, non-owner occupied
Financing Receivable, Past Due [Line Items]
Loans	2,251,351	2,400,839
Loans > 90 Days or More Past Due And Accruing	12,989	0
Commercial real estate, non-owner occupied | Current
Financing Receivable, Past Due [Line Items]
Loans	2,225,782	2,376,184
Commercial real estate, non-owner occupied | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	8,680	12,995
Commercial real estate, non-owner occupied | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	485	195
Commercial real estate, non-owner occupied | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	16,404	11,465
Commercial real estate, owner occupied
Financing Receivable, Past Due [Line Items]
Loans	1,152,751	1,162,083
Loans > 90 Days or More Past Due And Accruing	0	0
Commercial real estate, owner occupied | Current
Financing Receivable, Past Due [Line Items]
Loans	1,150,327	1,161,869
Commercial real estate, owner occupied | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	501	0
Commercial real estate, owner occupied | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	891	104
Commercial real estate, owner occupied | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,032	110
Residential
Financing Receivable, Past Due [Line Items]
Loans	2,366,943	2,288,921
Loans > 90 Days or More Past Due And Accruing	166	0
Residential | Current
Financing Receivable, Past Due [Line Items]
Loans	2,334,312	2,259,496
Residential | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	10,377	11,810
Residential | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	6,029	5,472
Residential | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	16,225	12,143
Home equity
Financing Receivable, Past Due [Line Items]
Loans	641,188	617,571
Loans > 90 Days or More Past Due And Accruing	20	52
Home equity | Current
Financing Receivable, Past Due [Line Items]
Loans	632,653	608,948
Home equity | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	3,212	3,614
Home equity | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,532	1,647
Home equity | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	3,791	3,362
Individuals' loans for household and other personal expenditures
Financing Receivable, Past Due [Line Items]
Loans	158,480	168,388
Loans > 90 Days or More Past Due And Accruing	0	0
Individuals' loans for household and other personal expenditures | Current
Financing Receivable, Past Due [Line Items]
Loans	155,526	167,553
Individuals' loans for household and other personal expenditures | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	2,567	635
Individuals' loans for household and other personal expenditures | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	385	192
Individuals' loans for household and other personal expenditures | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	2	8
Public finance and other commercial loans
Financing Receivable, Past Due [Line Items]
Loans	981,431	956,318
Loans > 90 Days or More Past Due And Accruing	0	34
Public finance and other commercial loans | Current
Financing Receivable, Past Due [Line Items]
Loans	981,431	956,284
Public finance and other commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Public finance and other commercial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Public finance and other commercial loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	$ 0	$ 34