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Other Comprehensive Income - Summary of Components of Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Equity [Abstract]        
Net change in fair value recorded in accumulated OCI, Before-tax $ (4,006) $ 12,318 $ 31,617 $ (382)
Net change in fair value recorded in accumulated OCI, Tax effect (1,683) 5,175 13,279 (159)
Net change in fair value recorded in accumulated OCI, After-tax (2,323) 7,143 18,338 (223)
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, Before-tax 0 6,690 0 6,690
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, Tax effect 0 2,808 0 2,808
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, After-tax 0 3,882 0 3,882
Amortization of unrealized (gains)/losses on securities transferred from available-for-sale to held-to-maturity, Before-tax 297 (334) (563) (334)
Amortization of unrealized (gains)/losses on securities transferred from available-for-sale to held-to-maturity, Tax effect 125 (140) (237) (140)
Amortization of unrealized (gains)/losses on securities transferred from available-for-sale to held-to-maturity, After-tax 172 (194) (326) (194)
Net realized (gain)/loss reclassified into earnings, Before-Tax (548) 22 (548) 22
Net realized (gain)/loss reclassified into earnings, Tax Effect (230) 9 (230) 9
Net realized (gain)/loss reclassified into earnings, After-Tax (318) 13 (318) 13
Net change, Before-tax (4,257) 18,696 30,506 5,996
Net change, Tax effect (1,788) 7,852 12,812 2,518
Net change, After-tax $ (2,469) $ 10,844 $ 17,694 $ 3,478