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Other Comprehensive Income - Summary of Components of OCI (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Equity [Abstract]        
Net change in fair value recorded in accumulated OCI, Before-tax $ (1,974) $ 5,672 $ 33,382 $ 44,586
Net change in fair value recorded in accumulated OCI, Tax effect 584 (1,677) (9,869) (13,181)
Net change in fair value recorded in accumulated OCI, After-tax (1,390) 3,995 23,513 31,405
Net realized gain (loss) reclassified into earnings Before-tax 0 (5) 0 (5)
Net realized gain reclassified into earnings Tax effect 0 1 0 1
Net realized gain reclassified into earnings After-tax 0 (4) 0 (4)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Before-tax (30) (249) (48) (1,450)
Amortization of unrealized gains (losses) on securities transferred from available-for-sale to held-to-maturity, Tax effect 9 74 14 429
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, After-tax (21) (175) (34) (1,021)
Net change, Before-tax (2,004) 5,418 33,334 43,131
Net change, Tax effect 593 (1,602) (9,855) (12,751)
Net change, After-tax $ (1,411) $ 3,816 $ 23,479 $ 30,380