ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassification Adjustments Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Unrealized gains on investments available for sale, affected line items in the Statements of Income
Investment securities gains	$ 8	$ 58
Income before taxes	8	58
Tax expense	(2)	(15)
Net income	6	43
Amortization of unrealized losses on debt securities transferred from available-for-sale to held-to-maturity:
Interest and dividends on investment securities	319	0
Income before taxes	319	0
Tax expense	(82)	0
Net income	237	0
Amortization of defined benefit pension plan items Affected line item in the Statements of Income:
Recognized actuarial loss	(196)	(227)
Loss before taxes	(196)	(227)
Tax benefit	50	63
Net loss	$ (146)	$ (164)

OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Gain (Loss), before Adjustment and Tax

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OCI, Debt Securities, Held-to-Maturity, Gain (Loss)

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Amount, before tax and adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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