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Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income, net of tax | $ (116,977) | $ (153,169)
Net unrealized loss on available for sale securities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income, before tax | (180,438) | (231,821)
Accumulated other comprehensive income, tax effect | 53,343 | 68,534
Accumulated other comprehensive income, net of tax | (127,095) | (163,287)
Unfunded status of the supplemental retirement plans |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income, before tax | 13,527 | 13,527
Accumulated other comprehensive income, tax effect | (3,999) | (3,999)
Accumulated other comprehensive income, net of tax | 9,528 | 9,528
Joint beneficiary agreement liability |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income, before tax | 590 | 590
Accumulated other comprehensive income, tax effect | 0 | 0
Accumulated other comprehensive income, net of tax | $ 590 | $ 590

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