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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Unrealized holding gains on securities arising during the period | $ 19,981 | $ 20,625 | $ 2,783
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax | 4,196 | 4,331 | 585
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax | 15,785 | 16,294 | 2,198
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | 70 | 22 | 8,102
Less: reclassification adjustment for (gains) losses on securities included in net income, Tax (Expense) Benefit | 15 | 5 | 1,701
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 55 | 17 | 6,401
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax | 19,911 | 20,603 | (5,319)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax | 4,181 | 4,326 | (1,116)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax | 15,730 | 16,277 | (4,203)
Unrealized holding (losses) gains on derivatives arising during the period | (4,467) | 935 | 326
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax | (938) | 196 | 68
Unrealized holding gains on derivatives arising during the period, Net of Tax Amount | (3,529) | 739 | 258
Reclassification adjustment for gains on derivatives included in net income, Pretax Amount | 0 | 0 | (10)
Reclassification adjustment for gains on derivatives included in net income, Tax (Expense) Benefit | 0 | 0 | (3)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 0 | 0 | (7)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax | (4,467) | 935 | 336
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax | (938) | 196 | 71
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax | (3,529) | 739 | 265
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | (537) | 0 | 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax | 113 | 0 | 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax | 424 | 0 | 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | 155 | 121 | (144)
Net (loss) gain, Tax (Expense) Benefit | 32 | 25 | (30)
Net gain | (123) | (96) | 114
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | 692 | 121 | (144)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | 145 | 25 | (30)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | 547 | 96 | (114)
Total other comprehensive (loss) income, Pretax Amount | 14,752 | 21,417 | (4,839)
Other Comprehensive Income (Loss), Tax | 3,098 | 4,497 | (1,015)
Total other comprehensive (loss) Income | 11,654 | 16,920 | (3,824)
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 | (424) |  |
Net gain | (123) |  |
Total other comprehensive (loss) Income | $ (547) | $ (96) | $ 114

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