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Other Comprehensive Income - Summary of Components of Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Equity [Abstract]    
Net change in fair value recorded in accumulated OCI, Before-tax $ 28,044 $ 20,270
Net change in fair value recorded in accumulated OCI, Tax effect 11,778 8,514
Net change in fair value recorded in accumulated OCI, After-tax 16,266 11,756
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 (774) 0
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, Tax effect (325) 0
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, After-tax (449) 0
Net realized loss reclassified into earnings, Before-Tax 0 0
Net realized loss reclassified into earnings, Tax Effect 0 0
Net realized loss reclassified into earnings, After-Tax 0 0
Net change, Before-tax 27,270 20,270
Net change, Tax effect 11,453 8,514
Net change, After-tax $ 15,817 $ 11,756