FAIR VALUE MEASUREMENTS - FV of Financial instruments., nonrecurring (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
FINANCIAL LIABILITIES: (Fair Value)
Accrued interest payable	$ 2,823	$ 563
Derivative Liabilities	4,501
Estimate of Fair Value Measurement [Member] | Fair Value Measurements, Nonrecurring | Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member]
FINANCIAL ASSETS: (Fair Value)
Cash and due from banks	9,462	9,441
Interest-bearing deposits in other banks	7,551	1,297
Restricted investment in bank stocks	10,885	7,136
Net loans	885,840	810,104
Mortgage servicing rights	265	319
Accrued interest receivable	5,201	4,391
FINANCIAL LIABILITIES: (Fair Value)
Demand, savings and other deposits	686,321	827,399
Time deposits	292,073	160,472
Short-term borrowings	153,509	153,209
Long-term borrowings	125,343	24,090
Subordinated debentures	22,762	22,365
Accrued interest payable	2,823	563
Derivative Liabilities	4,501	0
Estimate of Fair Value Measurement [Member] | Fair Value Measurements, Nonrecurring | Fair Value, Inputs, Level 1
FINANCIAL ASSETS: (Fair Value)
Cash and due from banks	9,462	9,441
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
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 [Member] | 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	7,551	1,297
Restricted investment in bank stocks	10,885	7,136
Net loans	0	0
Mortgage servicing rights	0	0
Accrued interest receivable	5,201	4,391
FINANCIAL LIABILITIES: (Fair Value)
Demand, savings and other deposits	686,321	827,399
Time deposits	292,073	160,472
Short-term borrowings	153,509	153,209
Long-term borrowings	125,343	24,090
Subordinated debentures	22,762	22,365
Accrued interest payable	2,823	563
Derivative Liabilities	4,501	0
Estimate of Fair Value Measurement [Member] | 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	885,840	810,104
Mortgage servicing rights	265	319
Accrued interest receivable	0	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 [Member] | Fair Value Measurements, Nonrecurring
FINANCIAL ASSETS: (Fair Value)
Cash and due from banks	9,462	9,441
Interest-bearing deposits in other banks	7,551	1,297
Restricted investment in bank stocks	10,885	7,136
Net loans	904,153	850,195
Mortgage servicing rights	265	319
Accrued interest receivable	5,201	4,391
FINANCIAL LIABILITIES: (Fair Value)
Demand, savings and other deposits	686,321	827,399
Time deposits	294,118	166,100
Short-term borrowings	153,468	153,418
Long-term borrowings	122,000	25,000
Subordinated debentures	25,000	25,000
Accrued interest payable	2,823	563
Derivative Liabilities	$ 4,501	$ 0