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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Unrealized holding (losses) gains on securities arising during the period | $ (131,838) | $ (29,892) | $ 19,981
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax | (27,686) | (6,278) | 4,196
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax | (104,152) | (23,614) | 15,785
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | 2 | 16 | 70
Less: reclassification adjustment for (gains) losses on securities included in net income, Tax (Expense) Benefit | 0 | 3 | 15
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 2 | 13 | 55
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax | 131,840 | 29,908 | (19,911)
Total Unrealized (Losses) Gains on Securities, Tax (Expense) Benefit | 27,686 | 6,281 | (4,181)
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax | 104,154 | 23,627 | (15,730)
Unrealized holding losses on derivatives arising during the period | (31,573) | (3,356) | (4,467)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax | 6,630 | 705 | 938
Unrealized holding gains on derivatives arising during the period, Net of Tax Amount | (24,943) | (2,651) | (3,529)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax | 31,573 | 3,356 | 4,467
Total unrealized gains on derivatives, Tax (Expense) Benefit | 6,630 | 705 | 938
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | 76 | 76 | (537)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax | (16) | (16) | 113
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax | 60 | (60) | 424
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | (143) | (275) | 155
Net (loss) gain, Tax (Expense) Benefit | (30) | (58) | 32
Net gain | 113 | (217) | 123
Total Unrealized Gains (Losses) for Postretirement Obligations, Before Tax | 219 | 351 | (692)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | 46 | 74 | (145)
Total Unrealized Gains (Losses) for Postretirement Obligations, Net of Tax | 173 | (277) | 547
Total other comprehensive (loss) income, Pretax Amount | (163,194) | (32,913) | 14,752
Other Comprehensive Income (Loss), Tax | (34,270) | (6,912) | 3,098
Total other comprehensive (loss) Income | (128,924) | (26,001) | 11,654
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax | (24,943) | (2,651) | (3,529)
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 | (60) | 424
Net gain | (113) |  |
Total other comprehensive (loss) Income | $ 173 | $ 277 | $ (547)

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