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Other Comprehensive Income - Summary of Components of OCI (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity [Abstract]      
Net change in fair value recorded in accumulated OCI, Before-tax $ 45,486 $ (26,435) $ (11,336)
Net change in fair value recorded in accumulated OCI, Tax effect (13,447) 7,815 4,760
Net change in fair value recorded in accumulated OCI, After-tax 32,039 (18,620) (6,576)
Net realized gain reclassified into earnings Before-tax (5) 0 (402)
Net realized gain reclassified into earnings Tax effect 1 0 169
Net realized gain reclassified into earnings After-tax (4) 0 (233)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Before-tax (1,614) (2,091) (3,293)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Tax effect 477 619 1,383
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, After-tax (1,137) (1,472) (1,910)
Net change, Before-tax 43,867 (28,526) (15,031)
Net change, Tax effect (12,969) 8,434 6,312
Net change, After-tax $ 30,898 $ (20,092) $ (8,719)