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Other Comprehensive Income (Loss) - Summary of Components of OCI (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Equity [Abstract]      
Net change in fair value recorded in accumulated OCI, Before-tax $ (498,759) $ (56,075) $ 32,849
Net change in fair value recorded in accumulated OCI, Tax effect 147,451 16,578 (9,711)
Net change in fair value recorded in accumulated OCI, After-tax (351,308) (39,497) 23,138
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Before-tax 681 256 (572)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Tax effect (201) (76) 169
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, After-tax 480 180 (403)
Net realized gain reclassified into earnings Before-tax 0 0 0
Net realized gain reclassified into earnings Tax effect 0 0 0
Net realized gain reclassified into earnings After-tax 0 0 0
Net change, Before-tax (498,078) (55,819) 32,277
Net change, Tax effect 147,250 16,502 (9,542)
Net change After-tax $ (350,828) $ (39,317) $ 22,735