ALLOWANCE FOR CREDIT LOSSES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 100,522	$ 130,172	$ 110,088	$ 131,606
Charge-offs	1,473	3,497	14,690	5,623
Recoveries	759	517	1,782	1,193
Provision (benefit)	1,545	(6,466)	4,173	(6,450)
Ending Balance	101,353	120,726	101,353	120,726
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	16,079	14,619	15,462	15,280
Provision (benefit)	1,701	(617)	2,318	(1,278)
Ending balance	17,780	14,002	17,780	14,002
Agricultural and Agricultural Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	2,667	7,111	5,213	7,129
Charge-offs	25	357	3,129	675
Recoveries	124	0	577	21
Provision (benefit)	182	406	287	685
Ending Balance	2,948	7,160	2,948	7,160
Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	7,875	11,012	8,427	11,935
Charge-offs	49	70	137	91
Recoveries	0	0	0	5
Provision (benefit)	745	(1,201)	281	(2,108)
Ending Balance	8,571	9,741	8,571	9,741
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	8,795	11,913	9,050	12,770
Charge-offs	563	509	5,959	1,307
Recoveries	188	191	472	493
Provision (benefit)	959	(1,500)	5,816	(1,861)
Ending Balance	9,379	10,095	9,379	10,095
Commercial and Industrial | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	25,800	36,095	27,738	38,818
Charge-offs	643	842	5,143	1,790
Recoveries	445	265	651	558
Provision (benefit)	2,066	(4,186)	4,422	(6,254)
Ending Balance	27,668	31,332	27,668	31,332
Owner occupied commercial real estate | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	17,975	19,416	19,214	20,001
Charge-offs	0	72	0	113
Recoveries	0	44	40	97
Provision (benefit)	(317)	602	(1,596)	5
Ending Balance	17,658	19,990	17,658	19,990
Non-owner occupied commercial real estate | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	16,013	24,694	17,908	20,873
Charge-offs	193	1,637	322	1,637
Recoveries	0	13	33	13
Provision (benefit)	(82)	(242)	(1,881)	3,579
Ending Balance	15,738	22,828	15,738	22,828
Real Estate Construction | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	21,397	19,931	22,538	20,080
Charge-offs	0	10	0	10
Recoveries	2	4	9	6
Provision (benefit)	(2,008)	(345)	(3,156)	(496)
Ending Balance	$ 19,391	$ 19,580	$ 19,391	$ 19,580