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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) | $ 44,538 | $ (44,040) | $ 36,192 | $ (31,511)
Unrealized holding gains (losses) on available for sale securities before reclassifications |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
OCI, before reclassifications, before tax | 63,232 | (62,525) | 48,438 | (44,901)
Reclassifications, before tax | (2) | 0 | 2,945 | 164
OCI, after reclassifications, before tax | 63,230 | (62,525) | 51,383 | (44,737)
Tax effect | (18,692) | 18,485 | (15,191) | 13,226
Other comprehensive income (loss) | 44,538 | (44,040) | 36,192 | (31,511)
Unfunded status of the supplemental retirement plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
OCI, before reclassifications, before tax | 114 | 114 | 344 | 342
Reclassifications, before tax | (114) | (114) | (344) | (342)
OCI, after reclassifications, before tax | 0 | 0 | 0 | 0
Tax effect | 0 | 0 | 0 | 0
Other comprehensive income (loss) | 0 | 0 | 0 | 0
Amortization of prior service cost |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassifications, before tax | 0 | 0 | 0 | 0
Amortization of actuarial losses |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassifications, before tax | (114) | (114) | (344) | (342)
Joint beneficiary agreement liability |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
OCI, before reclassifications, before tax | 0 | 0 | 0 | 0
Tax effect | 0 | 0 | 0 | 0
OCI, before reclassifications, net of tax | $ 0 | $ 0 | $ 0 | $ 0

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