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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, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) | $ (76,740) | $ (4,440) | $ (223,690) | $ (8,553)
Net unrealized loss on available for sale securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
OCI, before reclassifications, before tax | (109,341) | (6,304) | (317,659) | (11,249)
OCI, after reclassifications, before tax | (109,341) | (6,304) | (317,659) | (11,249)
Tax effect | 32,601 | 1,864 | 93,911 | 3,325
Reclassifications, before tax | 0 | 0 | 0 | 0
Other comprehensive income (loss) | (76,740) | (4,440) | (223,748) | (7,924)
Unfunded status of the supplemental retirement plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
OCI, before reclassifications, before tax | 5 | (49) | 97 | (147)
OCI, after reclassifications, before tax | 0 | 0 | 82 | 0
Tax effect |  | 0 | (24) | 0
Reclassifications, before tax | (5) | 49 | (15) | 147
Other comprehensive income (loss) | 0 | 0 | 58 | 0
Amortization of prior service cost |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassifications, before tax | (7) | (14) | (21) | (43)
Amortization of actuarial losses |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassifications, before tax | 2 | 63 | 6 | 190
Joint beneficiary agreement liability |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
OCI, before reclassifications, before tax | 0 | 0 | 0 | (629)
Tax effect | 0 | 0 | 0 | 0
OCI, before reclassifications, net of tax | $ 0 | $ 0 | $ 0 | $ (629)

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