INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Other than temporary impairment	$ 752	$ 764
Net unrealized losses on retirement plans	5,614	6,033
Net loss on available for sale securities	39,242
Loan loss provisions	10,054	12,476
Unfunded commitments	537	764
Deferred compensation	1,957	2,367
Compensated absences	709	739
Post-retirement benefits	1,051	1,284
Lease liability	1,572	1,597
Purchase accounting	114	1,333
Other	3,018	2,770
GROSS DEFERRED ASSETS	64,620	30,127
Deferred tax liabilities:
Net unrealized gains on securities available-for-sale		(4,269)
Depreciation	(660)	(1,611)
Mortgage servicing rights	(458)	(515)
Pensions	(1,120)	(1,647)
Right-of-use asset	(1,566)	(1,591)
Intangibles	(6,093)	(5,717)
FHLB stock dividends	(32)	(32)
Other	(4,118)	(4,113)
GROSS DEFERRED LIABILITIES	(14,047)	(19,495)
NET DEFERRED TAX ASSETS	$ 50,573	$ 10,632