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Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss) | $ (11,198) | $ 24,444
Unrealized holding gains (losses) on available for sale securities before reclassifications |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
OCI, before reclassifications, before tax | (15,899) | 34,540
Reclassifications, before tax | 0 | 164
OCI, after reclassifications, before tax | (15,899) | 34,704
Tax effect | 4,701 | (10,260)
Other comprehensive income (loss) | (11,198) | 24,444
Unfunded status of the supplemental retirement plans |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
OCI, before reclassifications, before tax | 459 | 114
Reclassifications, before tax | (459) | (114)
OCI, after reclassifications, before tax | 0 | 0
Tax effect | 0 | 0
Other comprehensive income (loss) | 0 | 0
Amortization of prior service cost |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Reclassifications, before tax | 0 | 0
Amortization of actuarial losses |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Reclassifications, before tax | (459) | (114)
Joint beneficiary agreement liability |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
OCI, before reclassifications, before tax | 0 | 0
Tax effect | 0 | 0
OCI, before reclassifications, net of tax | $ 0 | $ 0

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