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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
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