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Other Comprehensive Income (Loss) - Summary of Components of OCI (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Equity [Abstract]      
Net change in fair value recorded in accumulated OCI, Before-tax $ 56,075 $ 32,849 $ 45,486
Net change in fair value recorded in accumulated OCI, Tax effect (16,578) (9,711) (13,447)
Net change in fair value recorded in accumulated OCI, After-tax 39,497 23,138 32,039
Net realized gain reclassified into earnings Before-tax 0 0 (5)
Net realized gain reclassified into earnings Tax effect 0 0 1
Net realized gain reclassified into earnings After-tax 0 0 (4)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Before-tax (256) (572) (1,614)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Tax effect 76 169 477
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, After-tax (180) (403) (1,137)
Net change, Before-tax (55,819) 32,277 43,867
Net change, Tax effect (16,502) (9,542) (12,969)
Other comprehensive income (loss), net of tax $ (39,317) $ 22,735 $ 30,898