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Comprehensive Income - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassifications, before tax $ 0 $ (7) $ (110)
Other comprehensive income (loss) (11,299) 17,502 12,657
Net unrealized gain (loss) on available for sale securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
OCI, before reclassifications, before tax (19,575) 15,803 24,471
Reclassifications, before tax 0 (7) (110)
OCI, after reclassifications, before tax (19,575) 15,796 24,361
Tax effect 5,787 (4,670) (7,202)
Other comprehensive income (loss) (13,788) 11,126 17,159
Unfunded status of the supplemental retirement plans      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
OCI, before reclassifications, before tax 3,497 645 (6,745)
Reclassifications, before tax 196 9,254 354
OCI, after reclassifications, before tax 3,693 9,899 (6,391)
Tax effect (1,091) (2,927) 1,889
Other comprehensive income (loss) 2,602 6,972 (4,502)
Amortization of prior service cost      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassifications, before tax (58) (55) (54)
Amortization of actuarial losses      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassifications, before tax 254 9,309 408
Joint beneficiary agreement liability, net of tax      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
OCI, before reclassifications, before tax (113) (596) 0
OCI, before reclassifications, net of tax (113) (596) 0
Tax effect $ 0 $ 0 $ 0