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Other Comprehensive Income (Loss) - Summary of Components of OCI (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity [Abstract]      
Net change in fair value recorded in accumulated OCI, Before-tax $ (11,336) $ (15,792) $ (22,667)
Net change in fair value recorded in accumulated OCI, Tax effect (4,760) (6,633) (9,519)
Net change in fair value recorded in accumulated OCI, After-tax (6,576) (9,159) (13,148)
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, Before-tax 0 0 6,690
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, Tax effect 0 0 2,808
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, After-tax 0 0 3,882
Amortization of unrealized (gains)/losses on securities transferred from available-for-sale to held-to-maturity, Before-tax (3,293) (2,174) (1,573)
Amortization of unrealized (gains)/losses on securities transferred from available-for-sale to held-to-maturity, Tax effect (1,383) (913) (660)
Amortization of unrealized (gains)/losses on securities transferred from available-for-sale to held-to-maturity, After-tax (1,910) (1,261) (913)
Net realized (gain)/loss reclassified into earnings, Before-tax (402) (548) 22
Net realized (gain)/loss reclassified into earnings, Tax Effect (169) (230) 9
Net realized (gain)/loss reclassified into earnings, After-Tax (233) (318) 13
Net change, Before-tax (15,031) (18,514) (17,528)
Net change, Tax effect (6,312) (7,776) (7,362)
Net change, After-tax $ (8,719) $ (10,738) $ (10,166)