FAIR VALUE MEASUREMENTS - FV of Financial instruments., nonrecurring (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
FINANCIAL LIABILITIES: (Fair Value)
Accrued interest payable	$ 3,698	$ 2,823
Derivative Liabilities	741	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	14,292	9,462
Interest-bearing deposits in other banks	1,979	7,551
Restricted investment in bank stocks	11,493	10,885
Net loans	891,098	885,840
Mortgage servicing rights	241	265
Accrued interest receivable	5,328	5,201
FINANCIAL LIABILITIES: (Fair Value)
Demand, savings and other deposits	671,430	686,321
Time deposits	310,426	292,073
Short-term borrowings	175,555	153,509
Long-term borrowings	123,244	125,343
Subordinated debentures	20,378	22,762
Accrued interest payable	3,698	2,823
Derivative Liabilities	741	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	14,292	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
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	1,979	7,551
Restricted investment in bank stocks	11,493	10,885
Net loans	0	0
Mortgage servicing rights	0	0
Accrued interest receivable	5,328	5,201
FINANCIAL LIABILITIES: (Fair Value)
Demand, savings and other deposits	671,430	686,321
Time deposits	310,426	292,073
Short-term borrowings	175,555	153,509
Long-term borrowings	123,244	125,343
Subordinated debentures	20,378	22,762
Accrued interest payable	3,698	2,823
Derivative Liabilities	741	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	891,098	885,840
Mortgage servicing rights	241	265
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 | Fair Value Measurements, Nonrecurring
FINANCIAL ASSETS: (Fair Value)
Cash and due from banks	14,292	9,462
Interest-bearing deposits in other banks	1,979	7,551
Restricted investment in bank stocks	11,493	10,885
Net loans	914,807	904,153
Mortgage servicing rights	241	265
Accrued interest receivable	5,328	5,201
FINANCIAL LIABILITIES: (Fair Value)
Demand, savings and other deposits	671,430	686,321
Time deposits	312,779	294,118
Short-term borrowings	175,311	153,468
Long-term borrowings	122,000	122,000
Subordinated debentures	25,000	25,000
Accrued interest payable	3,698	2,823
Derivative Liabilities	$ 741	$ 4,501