LOANS (Past due financing receivables) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Nonaccrual	$ 103,123	$ 95,426
Total Loans	11,608,309	12,068,645
Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	29,405	13,477
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	23,883	7,704
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	4,859	3,266
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	663	2,507
Current
Financing Receivable, Past Due [Line Items]
Total Loans	11,475,781	11,959,742
Commercial and industrial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Nonaccrual	48,138	46,815
Total Loans	3,541,239	3,652,047
Commercial and industrial | Commercial and industrial | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	9,782	4,067
Commercial and industrial | Commercial and industrial | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	7,061	1,738
Commercial and industrial | Commercial and industrial | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	2,470	126
Commercial and industrial | Commercial and industrial | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	251	2,203
Commercial and industrial | Commercial and industrial | Current
Financing Receivable, Past Due [Line Items]
Total Loans	3,483,319	3,601,165
Commercial and industrial | Paycheck Protection Program ("PPP")
Financing Receivable, Past Due [Line Items]
Nonaccrual	0	0
Total Loans	1,864	2,777
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	1,864	2,630
Commercial and industrial | Owner occupied commercial real estate
Financing Receivable, Past Due [Line Items]
Nonaccrual	13,039	31,592
Total Loans	2,555,964	2,638,175
Commercial and industrial | Owner occupied commercial real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	3,544	2,943
Commercial and industrial | Owner occupied commercial real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	3,471	205
Commercial and industrial | Owner occupied commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	73	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	2,539,381	2,603,640
Commercial and industrial | Non-owner occupied commercial real estate
Financing Receivable, Past Due [Line Items]
Nonaccrual	135	367
Total Loans	2,434,258	2,553,711
Commercial and industrial | Non-owner occupied commercial real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	875
Commercial and industrial | Non-owner occupied commercial real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	875
Commercial and industrial | Non-owner occupied commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	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	2,434,123	2,552,469
Commercial and industrial | Real estate construction
Financing Receivable, Past Due [Line Items]
Nonaccrual	864	783
Total Loans	1,082,726	1,011,716
Commercial and industrial | Real estate construction | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	11,382	332
Commercial and industrial | Real estate construction | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	9,519	332
Commercial and industrial | Real estate construction | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,863	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	1,070,480	1,010,601
Agricultural and agricultural real estate
Financing Receivable, Past Due [Line Items]
Nonaccrual	34,065	9,210
Total Loans	802,958	919,184
Agricultural and agricultural real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	612	133
Agricultural and agricultural real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	245	121
Agricultural and agricultural real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	18	0
Agricultural and agricultural real estate | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	349	12
Agricultural and agricultural real estate | Current
Financing Receivable, Past Due [Line Items]
Total Loans	768,281	909,841
Residential real estate
Financing Receivable, Past Due [Line Items]
Nonaccrual	5,503	5,086
Total Loans	733,401	797,829
Residential real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,526	2,376
Residential real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,321	2,082
Residential real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	205	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	726,372	790,367
Consumer
Financing Receivable, Past Due [Line Items]
Nonaccrual	1,379	1,573
Total Loans	455,899	493,206
Consumer | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	2,559	2,604
Consumer | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	2,266	2,257
Consumer | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	230	150
Consumer | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	63	197
Consumer | Current
Financing Receivable, Past Due [Line Items]
Total Loans	$ 451,961	$ 489,029