LOANS AND ALLOWANCE FOR CREDIT LOSSES - Past Due Aging of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Loans	$ 12,486,027	$ 12,003,894
Loans > 90 Days or More Past Due And Accruing	172	1,737
Current
Financing Receivable, Past Due [Line Items]
Loans	12,406,783	11,952,887
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	34,075	29,051
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	11,189	5,935
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	33,980	16,021
Commercial and industrial loans
Financing Receivable, Past Due [Line Items]
Loans	3,670,948	3,437,126
Loans > 90 Days or More Past Due And Accruing	86	1,147
Commercial and industrial loans | Current
Financing Receivable, Past Due [Line Items]
Loans	3,657,447	3,429,314
Commercial and industrial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	5,021	4,904
Commercial and industrial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,622	434
Commercial and industrial loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	6,858	2,474
Agricultural land, production and other loans to farmers
Financing Receivable, Past Due [Line Items]
Loans	263,414	241,793
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	263,414	241,739
Agricultural land, production and other loans to farmers | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	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	54
Construction
Financing Receivable, Past Due [Line Items]
Loans	957,545	835,582
Loans > 90 Days or More Past Due And Accruing	0	0
Construction | Current
Financing Receivable, Past Due [Line Items]
Loans	955,588	832,716
Construction | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	2,436
Construction | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,957	418
Construction | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	12
Commercial real estate, non-owner occupied
Financing Receivable, Past Due [Line Items]
Loans	2,400,839	2,407,475
Loans > 90 Days or More Past Due And Accruing	0	264
Commercial real estate, non-owner occupied | Current
Financing Receivable, Past Due [Line Items]
Loans	2,376,184	2,395,495
Commercial real estate, non-owner occupied | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	12,995	5,946
Commercial real estate, non-owner occupied | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	195	881
Commercial real estate, non-owner occupied | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	11,465	5,153
Commercial real estate, owner occupied
Financing Receivable, Past Due [Line Items]
Loans	1,162,083	1,246,528
Loans > 90 Days or More Past Due And Accruing	0	0
Commercial real estate, owner occupied | Current
Financing Receivable, Past Due [Line Items]
Loans	1,161,869	1,241,714
Commercial real estate, owner occupied | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	4,495
Commercial real estate, owner occupied | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	104	0
Commercial real estate, owner occupied | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	110	319
Residential
Financing Receivable, Past Due [Line Items]
Loans	2,288,921	2,096,655
Loans > 90 Days or More Past Due And Accruing	0	0
Residential | Current
Financing Receivable, Past Due [Line Items]
Loans	2,259,496	2,079,959
Residential | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	11,810	8,607
Residential | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	5,472	2,278
Residential | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	12,143	5,811
Home equity
Financing Receivable, Past Due [Line Items]
Loans	617,571	630,632
Loans > 90 Days or More Past Due And Accruing	52	326
Home equity | Current
Financing Receivable, Past Due [Line Items]
Loans	608,948	624,543
Home equity | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	3,614	2,206
Home equity | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,647	1,782
Home equity | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	3,362	2,101
Consumer
Financing Receivable, Past Due [Line Items]
Loans	168,388	175,211
Loans > 90 Days or More Past Due And Accruing	0	0
Consumer | Current
Financing Receivable, Past Due [Line Items]
Loans	167,553	174,629
Consumer | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	635	343
Consumer | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	192	142
Consumer | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	8	97
Public finance and other commercial loans
Financing Receivable, Past Due [Line Items]
Loans	956,318	932,892
Loans > 90 Days or More Past Due And Accruing	34	0
Public finance and other commercial loans | Current
Financing Receivable, Past Due [Line Items]
Loans	956,284	932,778
Public finance and other commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	114
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	$ 34	$ 0