ALLOWANCE FOR CREDIT LOSSES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 101,353	$ 120,726	$ 110,088	$ 131,606
Charge-offs	938	1,167	15,628	6,790
Recoveries	912	2,422	2,694	3,615
Provision (benefit)	4,388	(4,448)	8,561	(10,898)
Ending Balance	105,715	117,533	105,715	117,533
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	17,780	14,002	15,462	15,280
Provision (benefit)	1,104	(35)	3,422	(1,313)
Ending balance	18,884	13,967	18,884	13,967
Agricultural and Agricultural Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	2,948	7,160	5,213	7,129
Charge-offs	34	195	3,163	870
Recoveries	76	466	653	487
Provision (benefit)	(423)	(1,105)	(136)	(420)
Ending Balance	2,567	6,326	2,567	6,326
Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	8,571	9,741	8,427	11,935
Charge-offs	1	22	138	113
Recoveries	0	2	0	7
Provision (benefit)	(1,144)	(483)	(863)	(2,591)
Ending Balance	7,426	9,238	7,426	9,238
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	9,379	10,095	9,050	12,770
Charge-offs	483	725	6,442	2,032
Recoveries	307	333	779	826
Provision (benefit)	205	(583)	6,021	(2,444)
Ending Balance	9,408	9,120	9,408	9,120
Commercial and Industrial | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	27,668	31,332	27,738	38,818
Charge-offs	385	106	5,528	1,896
Recoveries	506	1,553	1,157	2,111
Provision (benefit)	2,474	(4,871)	6,896	(11,125)
Ending Balance	30,263	27,908	30,263	27,908
Owner occupied commercial real estate | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	17,658	19,990	19,214	20,001
Charge-offs	0	119	0	232
Recoveries	0	46	40	143
Provision (benefit)	(686)	(789)	(2,282)	(784)
Ending Balance	16,972	19,128	16,972	19,128
Non-owner occupied commercial real estate | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	15,738	22,828	17,908	20,873
Charge-offs	0	0	322	1,637
Recoveries	20	20	53	33
Provision (benefit)	(949)	(733)	(2,830)	2,846
Ending Balance	14,809	22,115	14,809	22,115
Real Estate Construction | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	19,391	19,580	22,538	20,080
Charge-offs	35	0	35	10
Recoveries	3	2	12	8
Provision (benefit)	4,911	4,116	1,755	3,620
Ending Balance	$ 24,270	$ 23,698	$ 24,270	$ 23,698