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Comprehensive Loss - Components of Other Comprehensive loss and Related Tax Effects (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive loss | $ (44,040) | $ (76,740) | $ (31,511) | $ (223,690)
Unrealized holding losses on available for sale securities before reclassifications |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
OCI, before reclassifications, before tax | (62,525) | (109,341) | (44,901) | (317,659)
Reclassifications, before tax | 0 | 0 | 164 | 0
OCI, after reclassifications, before tax | (62,525) | (109,341) | (44,737) | (317,659)
Tax effect | 18,485 | 32,601 | 13,226 | 93,911
Other comprehensive loss | (44,040) | (76,740) | (31,511) | (223,748)
Unfunded status of the supplemental retirement plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
OCI, before reclassifications, before tax | 114 | 5 | 342 | 97
Reclassifications, before tax | (114) | (5) | (342) | (15)
OCI, after reclassifications, before tax | 0 | 0 | 0 | 82
Tax effect | 0 | 0 | 0 | (24)
Other comprehensive loss | 0 | 0 | 0 | 58
Amortization of prior service cost |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassifications, before tax | 0 | (7) | 0 | (21)
Amortization of actuarial losses |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassifications, before tax | (114) | 2 | (342) | 6
Joint beneficiary agreement liability |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
OCI, before reclassifications, net of tax | $ 0 | $ 0 | $ 0 | $ 0

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