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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassifications, before tax | $ 284 | $ 0 | $ 0
Other comprehensive income (loss) | 40,736 | (194,886) | (11,299)
Net unrealized loss on available for sale securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
OCI, before reclassifications, before tax | 58,444 | (290,157) | (19,575)
Reclassifications, before tax | 284 | 0 | 0
OCI, after reclassifications, before tax | 58,728 | (290,157) | (19,575)
Tax effect | (17,363) | 85,781 | 5,787
Other comprehensive income (loss) | 41,365 | (204,376) | (13,788)
Unfunded status of the supplemental retirement plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
OCI, before reclassifications, before tax | 81 | 11,522 | 3,497
Reclassifications, before tax | (455) | (20) | 196
OCI, after reclassifications, before tax | (374) | 11,502 | 3,693
Tax effect | 111 | (3,401) | (1,091)
Other comprehensive income (loss) | (263) | 8,101 | 2,602
Amortization of prior service cost |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassifications, before tax | 0 | (28) | (58)
Amortization of actuarial losses |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassifications, before tax | (455) | 8 | 254
Joint beneficiary agreement liability, net of tax |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
OCI, before reclassifications, before tax | (366) | 1,389 | (113)
Tax effect | 0 | 0 | 0
OCI, before reclassifications, net of tax | $ (366) | $ 1,389 | $ (113)

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