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Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Equity [Abstract]
Unrealized holding losses on available for sale securities before reclassifications	$ (12,337)	$ (29,561)
Realized gain on debt securities	0	0
Unrealized holding losses on available for sale securities after reclassifications	(12,337)	(29,561)
Tax effect	3,647	8,739
Unrealized holding losses on available for sale securities, net of tax	(8,690)	(20,822)
Change in unfunded status of the supplemental retirement plans before reclassifications	(49)	448
Amounts reclassified out of AOCI:
Amortization of prior service cost	(14)	(14)
Amortization of actuarial losses	63	478
Total amounts reclassified out of accumulated other comprehensive income	49	464
Change in unfunded status of the supplemental retirement plans after reclassifications	0	912
Tax effect	0	0
Change in unfunded status of the supplemental retirement plans, net of tax	0	912
Change in joint beneficiary agreement liability before reclassifications	(629)	0
Tax effect	0	0
Change in joint beneficiary agreement liability before reclassifications, net of tax	(629)	0
Other comprehensive income (loss)	$ (9,319)	$ (19,910)

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