LOANS AND ALLOWANCE - Past Due Aging of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Loans	$ 12,639,650	$ 12,486,027
Loans > 90 Days or More Past Due And Accruing	1,686	172
Current
Financing Receivable, Past Due [Line Items]
Loans	12,541,459	12,406,783
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	29,083	34,075
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	30,178	11,189
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	38,930	33,980
Commercial and industrial loans
Financing Receivable, Past Due [Line Items]
Loans	3,949,817	3,670,948
Loans > 90 Days or More Past Due And Accruing	385	86
Commercial and industrial loans | Current
Financing Receivable, Past Due [Line Items]
Loans	3,932,986	3,657,447
Commercial and industrial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	6,014	5,021
Commercial and industrial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	463	1,622
Commercial and industrial loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	10,354	6,858
Agricultural land, production and other loans to farmers
Financing Receivable, Past Due [Line Items]
Loans	239,926	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	239,676	263,414
Agricultural land, production and other loans to farmers | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	250	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	823,267	957,545
Loans > 90 Days or More Past Due And Accruing	0	0
Construction | Current
Financing Receivable, Past Due [Line Items]
Loans	802,064	955,588
Construction | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Construction | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	21,203	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	2,323,533	2,400,839
Loans > 90 Days or More Past Due And Accruing	0	0
Commercial real estate, non-owner occupied | Current
Financing Receivable, Past Due [Line Items]
Loans	2,306,861	2,376,184
Commercial real estate, non-owner occupied | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,789	12,995
Commercial real estate, non-owner occupied | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,799	195
Commercial real estate, non-owner occupied | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	13,084	11,465
Commercial real estate, owner occupied
Financing Receivable, Past Due [Line Items]
Loans	1,174,195	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	1,170,516	1,161,869
Commercial real estate, owner occupied | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	3,237	0
Commercial real estate, owner occupied | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	104
Commercial real estate, owner occupied | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	442	110
Residential
Financing Receivable, Past Due [Line Items]
Loans	2,370,905	2,288,921
Loans > 90 Days or More Past Due And Accruing	1,187	0
Residential | Current
Financing Receivable, Past Due [Line Items]
Loans	2,342,411	2,259,496
Residential | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	12,483	11,810
Residential | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	4,213	5,472
Residential | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	11,798	12,143
Home equity
Financing Receivable, Past Due [Line Items]
Loans	631,104	617,571
Loans > 90 Days or More Past Due And Accruing	114	52
Home equity | Current
Financing Receivable, Past Due [Line Items]
Loans	621,441	608,948
Home equity | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	4,293	3,614
Home equity | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	2,152	1,647
Home equity | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	3,218	3,362
Individuals' loans for household and other personal expenditures
Financing Receivable, Past Due [Line Items]
Loans	162,089	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	160,690	167,553
Individuals' loans for household and other personal expenditures | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,017	635
Individuals' loans for household and other personal expenditures | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	348	192
Individuals' loans for household and other personal expenditures | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	34	8
Public finance and other commercial loans
Financing Receivable, Past Due [Line Items]
Loans	964,814	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	964,814	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