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Other Comprehensive Income (Loss) - Summary of Components of OCI (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Equity [Abstract]      
Net change in fair value recorded in accumulated OCI, Before-tax $ (15,792) $ (22,667) $ 69,661
Net change in fair value recorded in accumulated OCI, Tax effect (6,633) (9,519) 29,256
Net change in fair value recorded in accumulated OCI, After-tax (9,159) (13,148) 40,405
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, Before-tax 0 6,690 0
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, Tax effect 0 2,808 0
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, After-tax 0 3,882 0
Amortization of unrealized (gains)/losses on securities transferred from available-for-sale to held-to-maturity, Before-tax (2,174) (1,573) 0
Amortization of unrealized (gains)/losses on securities transferred from available-for-sale to held-to-maturity, Tax effect (913) (660) 0
Amortization of unrealized (gains)/losses on securities transferred from available-for-sale to held-to-maturity, After-tax (1,261) (913) 0
Net realized (gain)/loss reclassified into earnings, Before-tax (548) 22 0
Net realized (gain)/loss reclassified into earnings, Tax Effect (230) 9 0
Net realized (gain)/loss reclassified into earnings, After-Tax (318) 13 0
Net change, Before-tax (18,514) (17,528) 69,661
Net change, Tax effect (7,776) (7,362) 29,256
Net change, After-tax $ (10,738) $ (10,166) $ 40,405