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Other Comprehensive Income (Loss) - Summary of Components of Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Equity [Abstract]        
Net change in fair value recorded in accumulated OCI, Before-tax $ 12,318 $ (10,291) $ (382) $ 47,272
Net change in fair value recorded in accumulated OCI, Tax effect 5,175 (4,322) (159) 19,854
Net change in fair value recorded in accumulated OCI, After-tax 7,143 (5,969) (223) 27,418
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, Before-tax 6,690 0 6,690 0
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, Tax effect 2,808 0 2,808 0
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, After-tax 3,882 0 3,882 0
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, Before-tax (334) 0 (334) 0
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, Tax effect (140) 0 (140) 0
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, After-tax (194) 0 (194) 0
Net realized loss reclassified into earnings, Before-Tax 22 0 22 0
Net realized loss reclassified into earnings, Tax Effect 9 0 9 0
Net realized loss reclassified into earnings, After-Tax 13 0 13 0
Net change, Before-tax 18,696 (10,291) 5,996 47,272
Net change, Tax effect 7,852 (4,322) 2,518 19,854
Net change, After-tax $ 10,844 $ (5,969) $ 3,478 $ 27,418