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Supplemental Comprehensive Income Disclosures - Related Tax Effects Allocated to Each Component of Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Unrealized holding gains (losses) on securities arising during the period | $ 18,499 | $ (131,838) | $ (29,892)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax | 3,449 | (27,686) | (6,278)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax | 15,050 | (104,152) | (23,614)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | (103) | 2 | 16
Less: reclassification adjustment for (gains) losses on securities included in net income, Tax (Expense) Benefit | (22) | 0 | 3
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | (81) | 2 | 13
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax | (18,602) | 131,840 | 29,908
Total Unrealized (Losses) Gains on Securities, Tax (Expense) Benefit | (3,471) | 27,686 | 6,281
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax | (15,131) | 104,154 | 23,627
Unrealized holding gains (losses) on derivatives arising during the period | 13,462 | (31,573) | (3,356)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax | (2,733) | 6,630 | 705
Unrealized holding gains on derivatives arising during the period, Net of Tax Amount | 10,729 | (24,943) | (2,651)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax | (13,462) | 31,573 | 3,356
Total unrealized gains on derivatives, Tax (Expense) Benefit | (2,733) | 6,630 | 705
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | 76 | 76 | 76
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax | (15) | (16) | (16)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax | 61 | 60 | 60
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | (22) | (143) | (275)
Net (loss) gain, Tax (Expense) Benefit | (7) | (30) | (58)
Net gain | 15 | 113 | 217
Total Unrealized Gains (Losses) for Postretirement Obligations, Before Tax | 98 | 219 | 351
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | 22 | 46 | 74
Total Unrealized Gains (Losses) for Postretirement Obligations, Net of Tax | 76 | 173 | 277
Total other comprehensive (loss) income, Pretax Amount | 32,162 | (163,194) | (32,913)
Other Comprehensive Income (Loss), Tax | 6,226 | (34,270) | (6,912)
Total other comprehensive (loss) Income | 25,936 | (128,924) | (26,001)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax | 10,729 | (24,943) | (2,651)
Post-Retirement Obligation |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax | 61 | 60 | 60
Net gain | 15 |  |
Total other comprehensive (loss) Income | $ 76 | $ 173 | $ 277

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