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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

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