LOANS AND ALLOWANCE FOR CREDIT LOSSES - Troubled Debt Restructurings by Modification Type (Details) - USD ($)	3 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers					$ 91,955,000	$ 48,636,000
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers					$ 26,372,000	$ 15,969,000
% of Total Class of Financing Receivable	0.49%	0.25%			0.60%	0.46%
Agricultural land, production and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers					$ 22,000	$ 34,000
% of Total Class of Financing Receivable						0.01%
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers					$ 22,915,000	$ 13,000
% of Total Class of Financing Receivable	2.81%				2.81%	0.00%
Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers					$ 31,492,000	$ 17,765,000
% of Total Class of Financing Receivable	0.94%	0.50%			1.32%	0.75%
Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers					$ 7,523,000	$ 14,319,000
% of Total Class of Financing Receivable	0.51%	0.60%			0.54%	1.24%
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers					$ 3,379,000	$ 472,000
% of Total Class of Financing Receivable	0.04%				0.13%	0.02%
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers					$ 252,000	$ 63,000
% of Total Class of Financing Receivable	0.01%	0.01%			0.03%	0.01%
Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers						$ 1,000
% of Total Class of Financing Receivable		0.00%				0.00%
Payment Delay
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	$ 10,093,000	$ 908,000			$ 13,011,000	$ 6,510,000
Payment Delay | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	9,600,000	908,000			11,080,000	908,000
Payment Delay		24,000			180,000	24,000
Payment Delay | Agricultural land, production and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers						0
Payment Delay | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	0				0	0
Payment Delay | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	0	0			0	0
Payment Delay | Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	0	0			0	5,602,000
Payment Delay						4,500,000
Payment Delay | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	493,000				1,931,000	0
Payment Delay	8,000				26,000
Payment Delay | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	0	0			0	0
Payment Delay | Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers		0				0
Payment Delay | Weighted-average | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payment Delay	200,000
Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	27,461,000	26,570,000			39,339,000	35,397,000
Term Extension | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	$ 10,333,000	$ 7,734,000			$ 12,880,000	$ 14,822,000
Term Extension	6 months	8 months			9 months	8 months
Term Extension | Agricultural land, production and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers						$ 34,000
Term Extension						60 months
Term Extension | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	$ 915,000				$ 915,000	$ 13,000
Term Extension	6 months				6 months	24 months
Term Extension | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	$ 10,254,000	$ 11,823,000			$ 18,933,000	$ 11,823,000
Term Extension	8 months	11 months			13 months	10 months
Term Extension | Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	$ 5,841,000	$ 6,950,000			$ 6,208,000	$ 8,642,000
Term Extension	8 months	4 months			13 months	4 months
Term Extension | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	$ 56,000				$ 341,000	$ 0
Term Extension	92 months				20 months
Term Extension | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	$ 62,000	$ 63,000			$ 62,000	$ 63,000
Term Extension	6 months	5 months			6 months	5 months
Term Extension | Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers		$ 0				$ 0
Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers					$ 247,000
Interest Rate Reduction | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers					$ 247,000
Reduced the weighted average contractual interest rate					8.00%		9.00%
Interest Rate Reduction | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers					$ 0
Interest Rate Reduction | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers					0
Interest Rate Reduction | Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers					0
Interest Rate Reduction | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers					0
Interest Rate Reduction | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers					0
Combination Payment Delay & Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	$ 22,000,000	1,000			22,462,000	473,000
Combination Payment Delay & Term Extension | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	0	0			17,000	0
Payment Delay					$ 4,900
Term Extension					3 months
Combination Payment Delay & Term Extension | Agricultural land, production and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers						0
Combination Payment Delay & Term Extension | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	22,000,000				$ 22,000,000	0
Payment Delay	$ 475,000				$ 475,000
Term Extension	4 months				4 months
Combination Payment Delay & Term Extension | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	$ 0	0			$ 0	0
Combination Payment Delay & Term Extension | Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	0	0			0	0
Combination Payment Delay & Term Extension | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	0				283,000	472,000
Payment Delay		$ 300			$ 8,000	$ 3,400
Term Extension		3 months			153 months	3 months
Combination Payment Delay & Term Extension | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	0	$ 0			$ 162,000	$ 0
Payment Delay					$ 7,800	$ 300
Term Extension					60 months	3 months
Combination Payment Delay & Term Extension | Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers		1,000				$ 1,000
Combination Interest Rate Reduction & Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	10,859,000	134,000			$ 10,859,000	6,256,000
Combination Interest Rate Reduction & Term Extension | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	$ 31,000	$ 134,000			$ 31,000	$ 239,000
Term Extension	48 months	14 months			48 months	13 months
Reduced the weighted average contractual interest rate	8.05%	7.62%	9.50%	10.75%	8.05%	7.39%	9.50%	9.66%
Combination Interest Rate Reduction & Term Extension | Agricultural land, production and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers						$ 0
Combination Interest Rate Reduction & Term Extension | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	$ 0				$ 0	0
Combination Interest Rate Reduction & Term Extension | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	$ 10,828,000	$ 0			$ 10,828,000	$ 5,942,000
Term Extension	8 months				8 months	41 months
Reduced the weighted average contractual interest rate	7.88%		12.38%		7.88%	7.40%	12.38%	7.81%
Combination Interest Rate Reduction & Term Extension | Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	$ 0	0			$ 0	$ 75,000
Term Extension						114 months
Reduced the weighted average contractual interest rate						6.61%		10.25%
Combination Interest Rate Reduction & Term Extension | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	0				0	$ 0
Combination Interest Rate Reduction & Term Extension | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	0	0			0	0
Combination Interest Rate Reduction & Term Extension | Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers		$ 0				$ 0
Combination Interest Rate Reduction, Term Extension, & Payment Delay
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	304,000				529,000
Combination Interest Rate Reduction, Term Extension, & Payment Delay | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	0				0
Combination Interest Rate Reduction, Term Extension, & Payment Delay | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	0				0
Combination Interest Rate Reduction, Term Extension, & Payment Delay | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	0				0
Combination Interest Rate Reduction, Term Extension, & Payment Delay | Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	0				0
Combination Interest Rate Reduction, Term Extension, & Payment Delay | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	304,000				529,000
Payment Delay	$ 14,000				$ 14,000
Term Extension	149 months				91 months
Reduced the weighted average contractual interest rate	3.31%		5.73%		4.03%		5.74%
Combination Interest Rate Reduction, Term Extension, & Payment Delay | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modifications Made to Borrowers	$ 0				$ 0