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Other Comprehensive Income - Summary of Components of OCI (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Equity [Abstract]        
Net change in fair value recorded in accumulated OCI, Before-tax $ (1,263) $ 19,564 $ 35,356 $ 38,914
Net change in fair value recorded in accumulated OCI, Tax effect 373 (5,784) (10,453) (11,504)
Net change in fair value recorded in accumulated OCI, After-tax (890) 13,780 24,903 27,410
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Before-tax (17) (78) (18) (1,201)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Tax effect 5 23 5 355
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, After-tax (12) (55) (13) (846)
Net change, Before-tax (1,280) 19,486 35,338 37,713
Net change, Tax effect 378 (5,761) (10,448) (11,149)
Net change, After-tax $ (902) $ 13,725 $ 24,890 $ 26,564