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Other Comprehensive Income - Summary of Components of OCI (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Equity [Abstract]    
Net change in fair value recorded in accumulated OCI, Before-tax $ 40,424 $ (202,072)
Net change in fair value recorded in accumulated OCI, Tax effect (11,951) 59,740
Net change in fair value recorded in accumulated OCI, After-tax 28,473 (142,332)
Amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity, Before-tax 278 54
Amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity, Tax effect (82) (16)
Amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity, After-tax 196 38
Net change, Before-tax 40,702 (202,018)
Net change, Tax effect (12,033) 59,724
Other comprehensive income (loss), net of tax $ 28,669 $ (142,294)