Summary of Significant Accounting Policies - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [Abstract]
Unrealized loss for pension and other postretirement obligations	$ (1,907)	$ (2,832)
Tax effect	495	739
Net unrealized loss for pension and other postretirement obligations	(1,412)	(2,093)
Unrealized gain (loss) on available-for-sale securities	579	1,133
Tax effect	(151)	(296)
Net unrealized gain on available-for-sale securities	428	837
Unrealized holding losses on hedging activities arising during the period	(388)	(1,308)
Tax effect	102	342
Net unrealized loss on hedging activities	(286)	(966)
Unrealized loss on securities transferred to held-to-maturity	(2)	(22)
Tax effect	4	8
Net unrealized gain (loss) on securities transferred to held-to-maturity	2	(14)
Accumulated other comprehensive loss	$ (1,268)	$ (2,236)