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Other Comprehensive Income (Loss) - Summary of Components of OCI (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Equity [Abstract]      
Net change in fair value recorded in accumulated OCI, Before-tax $ 50,331 $ (498,759) $ (56,075)
Net change in fair value recorded in accumulated OCI, Tax effect (14,880) 147,451 16,578
Net change in fair value recorded in accumulated OCI, After-tax 35,451 (351,308) (39,497)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Before-tax 914 681 256
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Tax effect (270) (201) (76)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, After-tax 644 480 180
Net realized gain reclassified into earnings Before-tax 6,938 0 0
Net realized gain reclassified into earnings Tax effect 2,070 0 0
Net realized gain reclassified into earnings After-tax (4,868) 0 0
Net change, Before-tax 44,306 (498,078) (55,819)
Net change, Tax effect (13,079) 147,250 16,502
Net change After-tax $ 31,227 $ (350,828) $ (39,317)