ACCUMULATED OTHER COMPREHENSIVE INCOME OR LOSS (Tables)

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Summary of Changes in Accumulated Other Comprehensive Income or Loss by Component, Net of Tax

The following is a summary of the changes in accumulated other comprehensive income or loss by component, net of tax, for the periods indicated (in thousands):

	Unrealized Gains and Losses on Securities Available for Sale		Defined Benefit and Other Benefit Plans		Total
Balance at January 1, 2020	$	1,368	$	(7,167)	$	(5,799)
Other comprehensive income before reclassification	7,759		377		8,136
Amounts reclassified from accumulated other comprehensive income (loss)	—		64		64
Net current period other comprehensive income (loss)	7,759		441		8,200
Balance at December 31, 2020	$	9,127	$	(6,726)	$	2,401

	Unrealized Gains and Losses on Securities Available for Sale		Defined Benefit and Other Benefit Plans		Total
Balance at January 1, 2019	$	(4,646)	$	(6,765)	$	(11,411)
Other comprehensive income (loss) before reclassification	6,028		(467)		5,561
Amounts reclassified from accumulated other comprehensive income (loss)	(14)		65		51
Net current period other comprehensive income (loss)	6,014		(402)		5,612
Balance at December 31, 2019	$	1,368	$	(7,167)	$	(5,799)

	Unrealized Gains and Losses on Securities Available for Sale		Defined Benefit and Other Benefit Plans		Total
Balance at Balance at December 31, 2017	$	(3,415)	$	(6,925)	$	(10,340)
Cumulative effect of accounting change	(202)		—		(202)
Balance at January 1, 2018	(3,617)		(6,925)		(10,542)
Other comprehensive income (loss) before reclassification	(1,029)		(530)		(1,559)
Amounts reclassified from accumulated other comprehensive income (loss)	—		690		690
Net current period other comprehensive loss	(1,029)		160		(869)
Balance at December 31, 2018	$	(4,646)	$	(6,765)	$	(11,411)

Reclassification Out of Accumulated Other Comprehensive Income

The following is the reclassification out of accumulated other comprehensive income (loss) for the periods indicated (in thousands):

Details about Accumulated Other Comprehensive Income (Loss) Components	Year Ended December 31,						Affected Line Item  in the Statement Where Net Income is Presented
	2020		2019		2018
Unrealized gains and losses on securities available for sale:
Realized gains on securities available for sale	$	—	$	(19)	$	—	Net gains on securities transactions
Tax effect	—		5		—		Income tax expense
Net of tax	—		(14)		—
Amortization of defined pension plan and other benefit plan items:
Prior service costs (a)	(220)		(220)		(220)		Other components of net periodic pension and postretirement benefits
Actuarial losses (a)	300		312		1,146		Other components of net periodic pension and postretirement benefits
Tax effect	(15)		(27)		(236)		Income tax expense
Net of tax	65		65		690
Total reclassification for the period, net of tax	$	65	$	51	$	690

(a) These accumulated other comprehensive income (loss) components are included in the computation of net periodic pension and other benefit plan costs (see Note 14 for additional information).