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Other Comprehensive Income - Summary of Components of OCI (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Equity [Abstract]        
Net change in fair value recorded in accumulated OCI, Before-tax $ 5,672 $ (10,235) $ 44,586 $ (47,346)
Net change in fair value recorded in accumulated OCI, Tax effect (1,677) 3,025 (13,181) 13,997
Net change in fair value recorded in accumulated OCI, After-tax 3,995 (7,210) 31,405 (33,349)
Net realized gain reclassified into earnings Before-tax (5) 0 (5) 0
Net realized gain reclassified into earnings Tax effect 1 0 1 0
Net realized gain reclassified into earnings After-tax (4) 0 (4) 0
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Before-tax (249) (152) (1,450) (1,809)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Tax effect 74 45 429 535
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, After-tax (175) (107) (1,021) (1,274)
Net change, Before-tax 5,418 (10,387) 43,131 (49,155)
Net change, Tax effect (1,602) 3,070 (12,751) 14,532
Net change, After-tax $ 3,816 $ (7,317) $ 30,380 $ (34,623)