FAIR VALUE MEASUREMENTS - FV of Financial instruments., nonrecurring (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
FINANCIAL LIABILITIES: (Fair Value)
Accrued interest payable	$ 2,590	$ 2,823
Derivative Liabilities	5,214	4,501
Estimate of Fair Value Measurement | Fair Value Measurements, Nonrecurring | Fair Value, Inputs, Level 1, Level 2, and Level 3
FINANCIAL ASSETS: (Fair Value)
Cash and due from banks	13,937	9,462
Interest-bearing deposits in other banks	10,087	7,551
Restricted investment in bank stocks	10,765	10,885
Net loans	925,914	885,840
Mortgage servicing rights	231	265
Accrued interest receivable	5,259	5,201
Derivative Assets	567
FINANCIAL LIABILITIES: (Fair Value)
Demand, savings and other deposits	687,610	686,321
Time deposits	331,464	292,073
Short-term borrowings	167,749	153,509
Long-term borrowings	105,927	125,343
Subordinated debentures	21,348	22,762
Accrued interest payable	2,590	2,823
Derivative Liabilities	5,781	4,501
Estimate of Fair Value Measurement | Fair Value Measurements, Nonrecurring | Fair Value, Inputs, Level 1
FINANCIAL ASSETS: (Fair Value)
Cash and due from banks	13,937	9,462
Interest-bearing deposits in other banks	0	0
Restricted investment in bank stocks	0	0
Net loans	0	0
Mortgage servicing rights	0	0
Accrued interest receivable	0	0
Derivative Assets	0
FINANCIAL LIABILITIES: (Fair Value)
Demand, savings and other deposits	0	0
Time deposits	0	0
Short-term borrowings	0	0
Long-term borrowings	0	0
Subordinated debentures	0	0
Accrued interest payable	0	0
Derivative Liabilities	0	0
Estimate of Fair Value Measurement | Fair Value Measurements, Nonrecurring | Fair Value, Inputs, Level 2
FINANCIAL ASSETS: (Fair Value)
Cash and due from banks	0	0
Interest-bearing deposits in other banks	10,087	7,551
Restricted investment in bank stocks	10,765	10,885
Net loans	0	0
Mortgage servicing rights	0	0
Accrued interest receivable	5,259	5,201
Derivative Assets	567
FINANCIAL LIABILITIES: (Fair Value)
Demand, savings and other deposits	687,610	686,321
Time deposits	331,464	292,073
Short-term borrowings	167,749	153,509
Long-term borrowings	105,927	125,343
Subordinated debentures	21,348	22,762
Accrued interest payable	2,590	2,823
Derivative Liabilities	5,781	4,501
Estimate of Fair Value Measurement | Fair Value Measurements, Nonrecurring | Fair Value, Inputs, Level 3
FINANCIAL ASSETS: (Fair Value)
Cash and due from banks	0	0
Interest-bearing deposits in other banks	0	0
Restricted investment in bank stocks	0	0
Net loans	925,914	885,840
Mortgage servicing rights	231	265
Accrued interest receivable	0	0
Derivative Assets	0
FINANCIAL LIABILITIES: (Fair Value)
Demand, savings and other deposits	0	0
Time deposits	0	0
Short-term borrowings	0	0
Long-term borrowings	0	0
Subordinated debentures	0	0
Accrued interest payable	0	0
Derivative Liabilities	0	0
Reported Value Measurement | Fair Value Measurements, Nonrecurring
FINANCIAL ASSETS: (Fair Value)
Cash and due from banks	13,937	9,462
Interest-bearing deposits in other banks	10,087	7,551
Restricted investment in bank stocks	10,765	10,885
Net loans	926,942	904,153
Mortgage servicing rights	231	265
Accrued interest receivable	5,259	5,201
Derivative Assets	567
FINANCIAL LIABILITIES: (Fair Value)
Demand, savings and other deposits	687,610	686,321
Time deposits	332,299	294,118
Short-term borrowings	167,475	153,468
Long-term borrowings	102,000	122,000
Subordinated debentures	25,000	25,000
Accrued interest payable	2,590	2,823
Derivative Liabilities	$ 5,781	$ 4,501