INCOME TAXES - Deferred taxes included in other assets (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Allowance for loan losses	$ 782,000	$ 833,000
Employee benefit plans' liabilities	4,029,000	4,079,000
Unrealized loss on available for sale securities, charged from equity	9,286,000	9,909,000
Loss on credit impairment of securities	423,000	423,000
Earned retiree health benefits plan liability	1,222,000	1,276,000
General business and AMT credits	1,000	1,033,000
State income tax net operating loss carryforward	930,000	1,111,000
Other	218,000	279,000
Valuation allowance	(423,000)	(15,617,000)
Deferred tax assets	16,468,000	3,326,000
Deferred tax liabilities:
Unearned retiree health benefits plan asset	460,000	469,000
Bank premises and equipment	2,106,000	2,088,000
Other		13,000
Deferred tax liabilities	2,566,000	2,570,000
Net deferred taxes	$ 13,902,000	756,000
As originally reported
Deferred tax assets:
Allowance for loan losses		695,000
Employee benefit plans' liabilities		3,434,000
Unrealized loss on available for sale securities, charged from equity		8,341,000
Loss on credit impairment of securities		356,000
Earned retiree health benefits plan liability		1,074,000
General business and AMT credits		210,000
Other		344,000
Valuation allowance		(11,534,000)
Deferred tax assets		2,920,000
Deferred tax liabilities:
Unearned retiree health benefits plan asset		395,000
Bank premises and equipment		1,759,000
Other		10,000
Deferred tax liabilities		2,164,000
Net deferred taxes		$ 756,000