LOANS AND ALLOWANCE FOR CREDIT LOSSES- Impaired loans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Modifications [Line Items]
Financing Receivable, Recorded Investment		$ 7,480,000
Unpaid principal balance	$ 911,078,000	858,469,000
Related allowance	6,925,000	8,274,000	$ 8,680,000
Recorded Investment
With no related allowance recorded	4,925,000	11,207,000
Total	4,925,000	11,207,000
Unpaid Principal Balance
With no related allowance recorded	6,914,000
With no related allowance recorded		14,174,000
Total	6,914,000	14,174,000
Average Recorded Investment
With no related allowance recorded	5,332,000
Total	5,332,000
With no related allowance recorded		12,574,000
Total		12,574,000
Interest Income Recognized
With no related allowance recorded	24,000
Total	24,000
With no related allowance recorded		309,000
Total		309,000
Real Estate
Financing Receivable, Modifications [Line Items]
Unpaid principal balance	811,493,000	764,880,000
Related allowance	6,539,000	7,483,000
Recorded Investment
With no related allowance recorded	4,005,000
Total	4,005,000
Unpaid Principal Balance
With no related allowance recorded	5,994,000
Total	5,994,000
Average Recorded Investment
With no related allowance recorded	4,380,000
Total	4,380,000
Agricultural
Financing Receivable, Modifications [Line Items]
Unpaid principal balance	671,000	860,000
Related allowance	1,000	6,000
Recorded Investment
With no related allowance recorded	309,000
Total	309,000
Unpaid Principal Balance
With no related allowance recorded	309,000
Total	309,000
Average Recorded Investment
With no related allowance recorded	309,000
Total	309,000
Interest Income Recognized
With no related allowance recorded	24,000
Total	24,000
Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Unpaid principal balance	66,909,000	56,077,000
Related allowance	265,000	504,000
Recorded Investment
With no related allowance recorded	611,000	973,000
Total	611,000	973,000
Unpaid Principal Balance
With no related allowance recorded	611,000
With no related allowance recorded		973,000
Total	611,000	973,000
Average Recorded Investment
With no related allowance recorded	643,000
Total	$ 643,000
With no related allowance recorded		992,000
Total		992,000
Interest Income Recognized
With no related allowance recorded		14,000
Total		14,000
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Unpaid principal balance		86,999,000
Related allowance		704,000	681,000
Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Unpaid principal balance		611,549,000
Related allowance		5,932,000	5,408,000
Recorded Investment
With no related allowance recorded		9,495,000
Total		9,495,000
Unpaid Principal Balance
With no related allowance recorded		12,430,000
Total		12,430,000
Average Recorded Investment
With no related allowance recorded		10,741,000
Total		10,741,000
Interest Income Recognized
With no related allowance recorded		294,000
Total		294,000
Residential Real Estate
Financing Receivable, Modifications [Line Items]
Unpaid principal balance		154,506,000
Related allowance		1,557,000	$ 1,539,000
Recorded Investment
With no related allowance recorded		739,000
Total		739,000
Unpaid Principal Balance
With no related allowance recorded		771,000
Total		771,000
Average Recorded Investment
With no related allowance recorded		841,000
Total		841,000
Interest Income Recognized
With no related allowance recorded		1,000
Total		$ 1,000