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Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassifications, before tax | $ 0 | $ 0 | $ (7)
Other comprehensive income (loss) | (194,886) | (11,299) | 17,502
Net unrealized loss on available for sale securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
OCI, before reclassifications, before tax | (290,157) | (19,575) | 15,803
Reclassifications, before tax | 0 | 0 | (7)
OCI, after reclassifications, before tax | (290,157) | (19,575) | 15,796
Tax effect | 85,781 | 5,787 | (4,670)
Other comprehensive income (loss) | (204,376) | (13,788) | 11,126
Unfunded status of the supplemental retirement plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
OCI, before reclassifications, before tax | 11,522 | 3,497 | 645
Reclassifications, before tax | (20) | 196 | 9,254
OCI, after reclassifications, before tax | 11,502 | 3,693 | 9,899
Tax effect | (3,401) | (1,091) | (2,927)
Other comprehensive income (loss) | 8,101 | 2,602 | 6,972
Amortization of prior service cost |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassifications, before tax | (28) | (58) | (55)
Amortization of actuarial losses |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassifications, before tax | 8 | 254 | 9,309
Joint beneficiary agreement liability, net of tax |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
OCI, before reclassifications, before tax | 1,389 | (113) | (596)
Tax effect | 0 | 0 | 0
OCI, before reclassifications, net of tax | $ 1,389 | $ (113) | $ (596)

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