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Other Comprehensive Income - Summary of Components of Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Equity [Abstract]    
Net change in fair value recorded in accumulated OCI, Before-tax $ 1,207 $ 28,044
Net change in fair value recorded in accumulated OCI, Tax effect 507 11,778
Net change in fair value recorded in accumulated OCI, After-tax 700 16,266
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, Before-tax 0 0
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, Tax effect 0 0
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, After-tax 0 0
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, Before-tax (783) (774)
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, Tax effect (329) (325)
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, After-tax (454) (449)
Net realized (gain)/loss reclassified into earnings, Before-tax 0 0
Net realized (gain)/loss reclassified into earnings, Tax Effect 0 0
Net realized (gain)/loss reclassified into earnings, After-Tax 0 0
Net Change, Before-tax 424 27,270
Net Change, Tax effect 178 11,453
Other comprehensive income, net of tax $ 246 $ 15,817