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Other Comprehensive Income - Summary of Components of OCI (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity [Abstract]      
Net change in fair value recorded in accumulated OCI, Before-tax $ 32,849 $ 45,486 $ (26,435)
Net change in fair value recorded in accumulated OCI, Tax effect (9,711) (13,447) 7,815
Net change in fair value recorded in accumulated OCI, After-tax 23,138 32,039 (18,620)
Net realized gain reclassified into earnings Before-tax 0 (5) 0
Net realized gain reclassified into earnings Tax effect 0 1 0
Net realized gain reclassified into earnings After-tax 0 (4) 0
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Before-tax (572) (1,614) (2,091)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Tax effect 169 477 619
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, After-tax (403) (1,137) (1,472)
Net change, Before-tax 32,277 43,867 (28,526)
Net change, Tax effect (9,542) (12,969) 8,434
Net change, After-tax $ 22,735 $ 30,898 $ (20,092)