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Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	$ (4,440)	$ 4,957	$ (8,553)	$ 10,798
Net unrealized gain on available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before reclassifications, before tax	(6,304)	4,645	(11,249)	10,043
Reclassifications, before tax	0	(7)	0	(7)
OCI, after reclassifications, before tax	(6,304)	4,638	(11,249)	10,036
Tax effect	1,864	(1,372)	3,325	(2,967)
Other comprehensive income (loss)	(4,440)	3,266	(7,924)	7,069
Unfunded status of the supplemental retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before reclassifications, before tax	(49)	1,936	(147)	2,607
Reclassifications, before tax	49	464	147	1,393
OCI, after reclassifications, before tax	0	2,400	0	4,000
Tax effect	0	(709)	0	(1,183)
Other comprehensive income (loss)	0	1,691	0	2,817
Amortization of prior service cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications, before tax	(14)	(14)	(43)	(41)
Amortization of actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications, before tax	63	478	190	1,434
Joint beneficiary agreement liability
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before reclassifications, before tax	0	0	(629)	912
Tax effect	0	0	0	0
OCI, before reclassifications, net of tax	$ 0	$ 0	$ (629)	$ 912

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