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Other Comprehensive Income (Loss) - Summary of Components of OCI (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Equity [Abstract]      
Net change in fair value recorded in accumulated OCI, Before-tax $ (22,667) $ 69,661 $ (88,562)
Net change in fair value recorded in accumulated OCI, Tax effect (9,519) 29,256 (37,196)
Net change in fair value recorded in accumulated OCI, After-tax (13,148) 40,405 (51,366)
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, Before-tax 6,690 0 0
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, Tax effect 2,808 0 0
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, After-tax 3,882 0 0
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, Before-tax (1,573) 0 0
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, Tax effect (660) 0 0
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, After-tax (913) 0 0
Net realized loss/(gains) reclassified into earnings, Before-Tax 22 0 (2,094)
Net realized loss/(gains) reclassified into earnings, Tax Effect 9 0 (879)
Net realized loss/(gains) reclassified into earnings, After-Tax 13 0 (1,215)
Net change, Before-tax (17,528) 69,661 (90,656)
Net change, Tax effect (7,362) 29,256 (38,075)
Net change, After-tax $ (10,166) $ 40,405 $ (52,581)