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Comprehensive Income - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Equity [Abstract]
Unrealized holding gains on available for sale securities before reclassifications	$ 4,645	$ 5,355	$ 10,043	$ 27,618
Realized gain on debt securities	(7)	(107)	(7)	(107)
Unrealized holding gains (losses) on available for sale securities after reclassifications	4,638	5,248	10,036	27,511
Tax effect	(1,372)	(1,551)	(2,967)	(8,133)
Unrealized holding gains on available for sale securities, net of tax	3,266	3,697	7,069	19,378
Change in unfunded status of the supplemental retirement plans before reclassifications	1,936	(89)	2,607	(266)
Amounts reclassified out of AOCI:
Amortization of prior service cost	(14)	(13)	(41)	(40)
Amortization of actuarial losses	478	102	1,434	306
Total amounts reclassified out of accumulated other comprehensive income	464	89	1,393	266
Change in unfunded status of the supplemental retirement plans after reclassifications	2,400	0	4,000	0
Tax effect	(709)	0	(1,183)	0
Change in unfunded status of the supplemental retirement plans, net of tax	1,691	0	2,817	0
Change in joint beneficiary agreement liability before reclassifications	0	0	912	0
Tax effect	0	0	0	0
Change in joint beneficiary agreement liability before reclassifications, net of tax	0	0	912	0
Other comprehensive income	$ 4,957	$ 3,697	$ 10,798	$ 19,378

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