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Accumulated Other Comprehensive Income (Loss) ("AOCI/L") - Schedule of Components of Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Accumulated other comprehensive income (loss), unrealized gain (loss) before reclassification, net of tax	$ 4	$ 12	$ 5	$ 523
Accumulated other comprehensive income (loss), reclassification of AOCI/L to income, net of tax	$ (52)	$ (90)	$ (182)	$ (157)

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Other Comprehensive Income Loss Cash Flow Hedge Gain Loss and Unrealized Holding Gain Loss On Securities Before Reclassification Tax

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Other Comprehensive Income Loss Cash Flow Hedge Gain Loss and Unrealized Holding Gain Loss On Securities Reclassification Tax

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