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Other Comprehensive Income - Summary of Components of Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Equity [Abstract]        
Net change in fair value recorded in accumulated OCI, Before-tax $ 2,838 $ 7,579 $ 4,045 $ 35,623
Net change in fair value recorded in accumulated OCI, Tax effect 1,192 3,183 1,699 14,961
Net change in fair value recorded in accumulated OCI, After-tax 1,646 4,396 2,346 20,662
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, Before-tax (1,196) (86) (1,979) (860)
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, Tax effect (502) (36) (831) (361)
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, After-tax (694) (50) (1,148) (499)
Net realized gain reclassified into earnings, Before-tax (402) 0 (402) 0
Net realized gain reclassified into earnings, Tax Effect (169) 0 (169) 0
Net realized gain reclassified into earnings, After-Tax (233) 0 (233) 0
Net Change, Before-tax 1,240 7,493 1,664 34,763
Net Change, Tax effect 521 3,147 699 14,600
Other comprehensive income, net of tax $ 719 $ 4,346 $ 965 $ 20,163