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Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) | $ 2,852 | $ (11,915) | $ (8,346) | $ 12,529
Unrealized holding gains (losses) on available for sale securities before reclassifications |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
OCI, before reclassifications, before tax | 1,106 | (16,916) | (14,793) | 17,624
Reclassifications, before tax | 2,945 | 0 | 2,945 | 164
OCI, after reclassifications, before tax | 4,051 | (16,916) | (11,848) | 17,788
Tax effect | (1,199) | 5,001 | 3,502 | (5,259)
Other comprehensive income (loss) | 2,852 | (11,915) | (8,346) | 12,529
Unfunded status of the supplemental retirement plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
OCI, before reclassifications, before tax | 115 | 114 | 230 | 228
Reclassifications, before tax | (115) | (114) | (230) | (228)
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 | (115) | (114) | (230) | (228)
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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