INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Allowance for loan losses	$ 5,147	$ 5,546
Depreciation	1,133	979
Deferred compensation and directors' fees	1,128	1,130
Operating lease liabilities	1,688	1,976
Purchase accounting adjustment – fixed assets	153	153
Net unrealized losses on securities available for sale	25,310	886
Defined benefit pension and other benefit plans	1,320	1,347
Nonaccrued interest	415	473
Accrued expense	117	139
Other items, net	112	127
Total gross deferred tax assets	36,523	12,756
Deferred tax liabilities:
Deferred loan fees and costs	1,358	355
Prepaid pension	4,055	3,715
Discount accretion	108	78
Core deposit intangible	1,733	1,556
REIT dividend	561	608
Operating lease right-of-use assets	1,688	1,976
Accrual for employee benefit plans	5	3
Other	219	344
Total gross deferred tax liabilities	9,727	8,635
Net deferred tax asset	$ 26,796	$ 4,121