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Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income, net of tax | $ (130,364) | $ (152,462)
Net unrealized loss on available for sale securities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income, before tax | (202,276) | (233,648)
Accumulated other comprehensive income, tax effect | 59,801 | 69,075
Accumulated other comprehensive income, net of tax | (142,475) | (164,573)
Unfunded status of the supplemental retirement plans |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income, before tax | 16,085 | 16,085
Accumulated other comprehensive income, tax effect | (4,756) | (4,756)
Accumulated other comprehensive income, net of tax | 11,329 | 11,329
Joint beneficiary agreement liability |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income, before tax | 782 | 782
Accumulated other comprehensive income, tax effect | 0 | 0
Accumulated other comprehensive income, net of tax | $ 782 | $ 782

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