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Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive loss, net of tax | $ (225,416) | $ (193,905)
Net unrealized loss on available for sale securities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive loss, before tax | (335,286) | (290,549)
Accumulated other comprehensive loss, tax effect | 99,123 | 85,897
Accumulated other comprehensive loss, net of tax | (236,163) | (204,652)
Unfunded status of the supplemental retirement plans |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive loss, before tax | 13,901 | 13,901
Accumulated other comprehensive loss, tax effect | (4,110) | (4,110)
Accumulated other comprehensive loss, net of tax | 9,791 | 9,791
Joint beneficiary agreement liability |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive loss, before tax | 956 | 956
Accumulated other comprehensive loss, tax effect | 0 | 0
Accumulated other comprehensive loss, net of tax | $ 956 | $ 956

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