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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Unrealized holding (losses) gains on securities arising during the period | $ (8,131) | $ 18,499 | $ (131,838)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax | (1,766) | 3,449 | (27,686)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax | (6,365) | 15,050 | (104,152)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | (5,446) | (103) | 2
Less: reclassification adjustment for (gains) losses on securities included in net income, Tax (Expense) Benefit | (1,144) | (22) | 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | (4,302) | (81) | 2
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax | 2,685 | (18,602) | 131,840
Total Unrealized (Losses) Gains on Securities, Tax (Expense) Benefit | 622 | (3,471) | 27,686
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax | 2,063 | (15,131) | 104,154
Unrealized holding gains (losses) on derivatives arising during the period | 14,379 | 13,462 | (31,573)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax | (3,069) | (2,733) | 6,630
Unrealized holding gains on derivatives arising during the period, Net of Tax Amount | 11,310 | 10,729 | (24,943)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax | (14,379) | (13,462) | 31,573
Total unrealized gains on derivatives, Tax (Expense) Benefit | (3,069) | (2,733) | 6,630
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 | (16) | (15) | (16)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax | 60 | 61 | 60
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | 83 | (22) | (143)
Net (loss) gain, Tax (Expense) Benefit | 18 | (7) | (30)
Net gain | (65) | 15 | 113
Total Unrealized Gains (Losses) for Postretirement Obligations, Before Tax | (7) | 98 | 219
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | (2) | 22 | 46
Total Unrealized Gains (Losses) for Postretirement Obligations, Net of Tax | (5) | 76 | 173
Total other comprehensive (loss) income, Pretax Amount | 11,687 | 32,162 | (163,194)
Other Comprehensive Income (Loss), Tax | 2,445 | 6,226 | (34,270)
Total other comprehensive (loss) Income | 9,242 | 25,936 | (128,924)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax | 11,310 | 10,729 | (24,943)
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 | 61 | 60
Net gain | (65) |  |
Total other comprehensive (loss) Income | $ (5) | $ 76 | $ 173

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