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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Unrealized holding (losses) gains on securities arising during the period | $ (29,892) | $ 19,981 | $ 20,625
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax | (6,278) | 4,196 | 4,331
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax | (23,614) | 15,785 | 16,294
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | 16 | 70 | 22
Less: reclassification adjustment for (gains) losses on securities included in net income, Tax (Expense) Benefit | 3 | 15 | 5
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 13 | 55 | 17
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax | 29,908 | (19,911) | (20,603)
Total Unrealized (Losses) Gains on Securities, Tax (Expense) Benefit | 6,281 | (4,181) | (4,326)
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax | 23,627 | (15,730) | (16,277)
Unrealized holding (losses) gains on derivatives arising during the period | (3,356) | (4,467) | 935
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax | (705) | (938) | 196
Unrealized holding gains on derivatives arising during the period, Net of Tax Amount | (2,651) | (3,529) | 739
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax | 3,356 | 4,467 | (935)
Total unrealized gains on derivatives, Tax (Expense) Benefit | 705 | 938 | (196)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax | 2,651 | 3,529 | (739)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | 76 | 537 | 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax | (16) | 113 | 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax | (60) | 424 | 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | (275) | 155 | 121
Net (loss) gain, Tax (Expense) Benefit | (58) | 32 | 25
Net gain | 217 | (123) | (96)
Total Unrealized Gains (Losses) for Postretirement Obligations, Before Tax | 351 | (692) | (121)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | 74 | (145) | (25)
Total Unrealized Gains (Losses) for Postretirement Obligations, Net of Tax | 277 | (547) | (96)
Total other comprehensive (loss) income, Pretax Amount | (32,913) | 14,752 | 21,417
Other Comprehensive Income (Loss), Tax | (6,912) | 3,098 | 4,497
Total other comprehensive (loss) Income | (26,001) | 11,654 | 16,920
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 | 60 |  |
Net gain | 217 |  |
Total other comprehensive (loss) Income | $ 277 | $ (547) | $ (96)

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