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Other Comprehensive Income - Summary of Components of OCI (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Equity [Abstract]        
Net change in fair value recorded in accumulated OCI, Before-tax $ 108,634 $ (130,768) $ 70,485 $ (128,340)
Net realized loss on investment securities reclassified into earnings, Before tax 11,582 0 11,582 0
OtherComprehensiveIncomeLoss Net realized loss on investment securities reclassified into earnings Net of tax (3,424) 0 (3,424) 0
OtherComprehensiveIncomeLoss Net realized loss on investment securities reclassified into earnings Net of tax 8,158 0 8,158 0
Net change in fair value recorded in accumulated OCI, Tax effect (32,116) 38,660 (20,838) 37,942
Net change in fair value recorded in accumulated OCI, After-tax 76,518 (92,108) 49,647 (90,398)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Before-tax 174 (3,096) 512 714
Amortization of unrealized gains (losses) on securities transferred from available-for-sale to held-to-maturity, Tax effect (52) 3,234 (152) (212)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, After-tax 122 138 360 502
Net change in fair value recorded in accumulated OCI (Derivatives designated as hedging instruments, Fair value hedges) Before - Tax (28,688) 13,739 (8,021) 24,868
Net change in fair value recorded in accumulated OCI (Derivatives designated as hedging instruments, Fair value hedges) Tax effect 8,258 (4,031) 2,350 (7,314)
Net change in fair value recorded in accumulated OCI (Derivatives designated as hedging instruments, Fair value hedges) After Tax (20,430) 9,708 (5,671) 17,554
Net change in fair value recorded in accumulated OCI (Derivatives designated as hedging instruments, Cash flow hedges) Before - Tax (6,913) 0 (5,329) 0
Net change in fair value recorded in accumulated OCI (Derivatives designated as hedging instruments, Cash flow hedges) Tax Effect 2,044 0 1,575 0
Net change in fair value recorded in accumulated OCI (Derivatives designated as hedging instruments, Cash flow hedges) After - Tax (4,869) 0 (3,754) 0
Net change, Before-tax 84,789 (120,125) 69,229 (102,758)
Net change, Tax effect (25,290) 37,863 (20,489) 30,416
Other comprehensive income (loss), net of tax $ 59,499 $ (82,262) $ 48,740 $ (72,342)