ALLOWANCE FOR CREDIT LOSSES - Schedule of Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 122,566	$ 109,483	$ 109,483
Charge-offs	(4,093)	(2,151)	(19,614)
Recoveries	1,793	3,191
Provision (benefit)	3,668	2,184
Ending Balance	123,934	112,707	122,566
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	16,468	20,196	20,196
Provision (benefit)	(2,682)	890
Ending balance	13,786	21,086	16,468
Agricultural and Agricultural Real Estate
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning Balance	4,292	2,634	2,634
Charge-offs	(267)	0	(5,319)
Recoveries	0	10
Provision (benefit)	1,083	(98)
Ending Balance	5,108	2,546	4,292
Residential Real Estate
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning Balance	5,845	7,711	7,711
Charge-offs	0	0	(183)
Recoveries	35	19
Provision (benefit)	(725)	(166)
Ending Balance	5,155	7,564	5,845
Consumer
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning Balance	8,572	9,582	9,582
Charge-offs	(1,529)	(686)	(3,677)
Recoveries	1,196	1,311
Provision (benefit)	(763)	(784)
Ending Balance	7,476	9,423	8,572
Commercial and Industrial | Commercial and industrial
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning Balance	40,679	29,071	29,071
Charge-offs	(2,297)	(1,451)	(8,622)
Recoveries	562	1,722
Provision (benefit)	2,161	2,481
Ending Balance	41,105	31,823	40,679
Owner occupied commercial real estate | Commercial and industrial
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning Balance	17,156	13,948	13,948
Charge-offs	0	(14)	(870)
Recoveries	0	112
Provision (benefit)	(2,761)	105
Ending Balance	14,395	14,151	17,156
Non-owner occupied commercial real estate | Commercial and industrial
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning Balance	17,249	16,539	16,539
Charge-offs	0	0	(627)
Recoveries	0	0
Provision (benefit)	(1,479)	523
Ending Balance	15,770	17,062	17,249
Real Estate Construction | Commercial and industrial
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning Balance	28,773	29,998	29,998
Charge-offs	0	0	(316)
Recoveries	0	17
Provision (benefit)	6,152	123
Ending Balance	$ 34,925	$ 30,138	$ 28,773