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Other Comprehensive Income - Summary of Components of OCI (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Equity [Abstract]        
Net change in fair value recorded in accumulated OCI, Before-tax $ (130,768) $ (194,111) $ (128,340) $ (539,066)
Net change in fair value recorded in accumulated OCI, Tax effect 38,660 57,386 37,942 159,367
Net change in fair value recorded in accumulated OCI, After-tax (92,108) (136,725) (90,398) (379,699)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Before-tax (3,096) 95 714 242
Amortization of unrealized gains (losses) on securities transferred from available-for-sale to held-to-maturity, Tax effect 3,234 (28) (212) (72)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, After-tax 138 67 502 170
Net change in fair value recorded in accumulated OCI Before tax 13,739 0 24,868 0
Net change in fair value recorded in accumulated OCI, Tax effect (4,031) 0 (7,314) 0
Net change in fair value recorded in accumulated OCI, After tax 9,708 0 17,554 0
Net change, Before-tax (120,125) (194,016) (102,758) (538,825)
Net change, Tax effect 37,863 57,358 30,416 159,296
Net change, After-tax $ (82,262) $ (136,658) $ (72,342) $ (379,529)