LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Past Due Aging of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Loans	$ 13,296,759	$ 12,854,359
Loans > 90 Days or More Past Due And Accruing	4,443	5,902
Current
Financing Receivable, Past Due [Line Items]
Loans	13,195,381	12,738,196
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	31,350	35,773
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	13,818	32,581
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	56,210	47,809
Commercial and industrial loans
Financing Receivable, Past Due [Line Items]
Loans	4,440,924	4,114,292
Loans > 90 Days or More Past Due And Accruing	3,946	2,010
Commercial and industrial loans \| Current
Financing Receivable, Past Due [Line Items]
Loans	4,426,862	4,096,605
Commercial and industrial loans \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	4,039	7,428
Commercial and industrial loans \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,216	473
Commercial and industrial loans \| 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	8,807	9,786
Agricultural land, production and other loans to farmers
Financing Receivable, Past Due [Line Items]
Loans	265,172	256,312
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	263,069	256,148
Agricultural land, production and other loans to farmers \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,866	164
Agricultural land, production and other loans to farmers \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	237	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	836,033	792,144
Loans > 90 Days or More Past Due And Accruing	0	3,683
Construction \| Current
Financing Receivable, Past Due [Line Items]
Loans	814,300	761,819
Construction \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	7,227	4,332
Construction \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	22,005
Construction \| 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	14,506	3,988
Commercial real estate, non-owner occupied
Financing Receivable, Past Due [Line Items]
Loans	2,171,092	2,274,016
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	2,165,891	2,259,549
Commercial real estate, non-owner occupied \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	203	2,407
Commercial real estate, non-owner occupied \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	451	1,718
Commercial real estate, non-owner occupied \| 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	4,547	10,342
Commercial real estate, owner occupied
Financing Receivable, Past Due [Line Items]
Loans	1,226,797	1,157,944
Loans > 90 Days or More Past Due And Accruing	183	0
Commercial real estate, owner occupied \| Current
Financing Receivable, Past Due [Line Items]
Loans	1,216,378	1,153,861
Commercial real estate, owner occupied \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	558	3,783
Commercial real estate, owner occupied \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	2,981	0
Commercial real estate, owner occupied \| 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	6,880	300
Residential
Financing Receivable, Past Due [Line Items]
Loans	2,397,094	2,374,729
Loans > 90 Days or More Past Due And Accruing	207	208
Residential \| Current
Financing Receivable, Past Due [Line Items]
Loans	2,359,067	2,337,002
Residential \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	12,420	12,302
Residential \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	6,890	6,606
Residential \| 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	18,717	18,819
Home equity
Financing Receivable, Past Due [Line Items]
Loans	673,961	659,811
Loans > 90 Days or More Past Due And Accruing	107	0
Home equity \| Current
Financing Receivable, Past Due [Line Items]
Loans	665,819	649,238
Home equity \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	3,538	4,431
Home equity \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,864	1,569
Home equity \| 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	2,740	4,573
Individuals' loans for household and other personal expenditures
Financing Receivable, Past Due [Line Items]
Loans	141,045	166,028
Loans > 90 Days or More Past Due And Accruing	0	1
Individuals' loans for household and other personal expenditures \| Current
Financing Receivable, Past Due [Line Items]
Loans	139,354	164,891
Individuals' loans for household and other personal expenditures \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,499	926
Individuals' loans for household and other personal expenditures \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	179	210
Individuals' loans for household and other personal expenditures \| 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	13	1
Public finance and other commercial loans
Financing Receivable, Past Due [Line Items]
Loans	1,144,641	1,059,083
Loans > 90 Days or More Past Due And Accruing	0	0
Public finance and other commercial loans \| Current
Financing Receivable, Past Due [Line Items]
Loans	1,144,641	1,059,083
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	$ 0