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Other Comprehensive Income - Summary of Components of OCI (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net change in fair value recorded in accumulated OCI, Before-tax $ 59,279 $ (35,856)
Net change in fair value recorded in accumulated OCI, Tax effect (17,525) 10,600
Net change in fair value recorded in accumulated OCI, After-tax 41,754 (25,256)
Amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity, Before-tax 138 163
Amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity, Tax effect (41) (48)
Amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity, After-tax 97 115
Net change, Before-tax 49,360 (17,073)
Net change, Tax effect (14,596) 5,357
Other comprehensive income (loss), net of tax 34,764 (11,716)
Fair Value Hedges [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Fair value hedges: Net change in fair value recorded in accumulated OCI, Before-tax (8,317) 17,831
Fair value hedges: Net change in fair value recorded in accumulated OCI, Tax effect 2,456 (4,962)
Other Comprehensive Income (Loss), Fair Value Hedge, Gain (Loss), after Tax, Total (5,861) 12,869
Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Cash flow hedges: Net change in fair value recorded in accumulated OCI, Before-tax (1,740) 789
Cash flow hedges: Net change in fair value recorded in accumulated OCI, Tax effect 514 (233)
Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax 1 $ (1,226) $ 556