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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, 2023 | Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss) | $ 24,444 | $ (78,339)
Unrealized holding gains (losses) on available for sale securities before reclassifications |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
OCI, before reclassifications, before tax | 34,540 | (111,302)
Reclassifications, before tax | 164 | 0
OCI, after reclassifications, before tax | 34,704 | (111,302)
Tax effect | (10,260) | 32,905
Other comprehensive income (loss) | 24,444 | (78,397)
Unfunded status of the supplemental retirement plans |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
OCI, before reclassifications, before tax | 114 | 63
Reclassifications, before tax | (114) | (5)
OCI, after reclassifications, before tax | 0 | 58
Tax effect | 0 | 0
Other comprehensive income (loss) | 0 | 58
Amortization of prior service cost |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Reclassifications, before tax | 0 | (7)
Amortization of actuarial losses |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Reclassifications, before tax | (114) | 2
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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