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Other Comprehensive Income - Summary of Components of OCI (Detail) - USD ($) $ in Thousands | 3 Months Ended
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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

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