LOANS (Past due financing receivables) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Total Loans	$ 11,440,917	$ 12,068,645
Nonaccrual	69,115	95,426
Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	30,322	13,477
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	13,053	7,704
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	16,437	3,266
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	832	2,507
Current
Financing Receivable, Past Due [Line Items]
Total Loans	11,341,480	11,959,742
Commercial and industrial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Loans	3,503,093	3,652,047
Nonaccrual	25,972	46,815
Commercial and industrial | Commercial and industrial | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	4,708	4,067
Commercial and industrial | Commercial and industrial | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	3,367	1,738
Commercial and industrial | Commercial and industrial | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	509	126
Commercial and industrial | Commercial and industrial | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	832	2,203
Commercial and industrial | Commercial and industrial | Current
Financing Receivable, Past Due [Line Items]
Total Loans	3,472,413	3,601,165
Commercial and industrial | Paycheck Protection Program ("PPP")
Financing Receivable, Past Due [Line Items]
Total Loans	1,582	2,777
Nonaccrual	0	0
Commercial and industrial | Paycheck Protection Program ("PPP") | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	147
Commercial and industrial | Paycheck Protection Program ("PPP") | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	94
Commercial and industrial | Paycheck Protection Program ("PPP") | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	53
Commercial and industrial | Paycheck Protection Program ("PPP") | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Commercial and industrial | Paycheck Protection Program ("PPP") | Current
Financing Receivable, Past Due [Line Items]
Total Loans	1,582	2,630
Commercial and industrial | Owner occupied commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans	2,489,697	2,638,175
Nonaccrual	5,411	31,592
Commercial and industrial | Owner occupied commercial real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,606	2,943
Commercial and industrial | Owner occupied commercial real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,503	205
Commercial and industrial | Owner occupied commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	103	2,664
Commercial and industrial | Owner occupied commercial real estate | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	74
Commercial and industrial | Owner occupied commercial real estate | Current
Financing Receivable, Past Due [Line Items]
Total Loans	2,482,680	2,603,640
Commercial and industrial | Non-owner occupied commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans	2,455,396	2,553,711
Nonaccrual	10,258	367
Commercial and industrial | Non-owner occupied commercial real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	909	875
Commercial and industrial | Non-owner occupied commercial real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	6	875
Commercial and industrial | Non-owner occupied commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	903	0
Commercial and industrial | Non-owner occupied commercial real estate | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Commercial and industrial | Non-owner occupied commercial real estate | Current
Financing Receivable, Past Due [Line Items]
Total Loans	2,444,229	2,552,469
Commercial and industrial | Real estate construction
Financing Receivable, Past Due [Line Items]
Total Loans	1,119,922	1,011,716
Nonaccrual	162	783
Commercial and industrial | Real estate construction | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	16,812	332
Commercial and industrial | Real estate construction | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	3,707	332
Commercial and industrial | Real estate construction | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	13,105	0
Commercial and industrial | Real estate construction | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Commercial and industrial | Real estate construction | Current
Financing Receivable, Past Due [Line Items]
Total Loans	1,102,948	1,010,601
Agricultural and agricultural real estate
Financing Receivable, Past Due [Line Items]
Total Loans	701,211	919,184
Nonaccrual	20,358	9,210
Agricultural and agricultural real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,058	133
Agricultural and agricultural real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,058	121
Agricultural and agricultural real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Agricultural and agricultural real estate | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	12
Agricultural and agricultural real estate | Current
Financing Receivable, Past Due [Line Items]
Total Loans	679,795	909,841
Residential real estate
Financing Receivable, Past Due [Line Items]
Total Loans	707,984	797,829
Nonaccrual	5,308	5,086
Residential real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	3,493	2,376
Residential real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	2,010	2,082
Residential real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,483	273
Residential real estate | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	21
Residential real estate | Current
Financing Receivable, Past Due [Line Items]
Total Loans	699,183	790,367
Consumer
Financing Receivable, Past Due [Line Items]
Total Loans	462,032	493,206
Nonaccrual	1,646	1,573
Consumer | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,736	2,604
Consumer | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,402	2,257
Consumer | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	334	150
Consumer | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	197
Consumer | Current
Financing Receivable, Past Due [Line Items]
Total Loans	$ 458,650	$ 489,029