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Tax Effects on Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Pre-Tax Amount |  |  |
Net change in unrealized gains on securities available-for-sale | $ (663) | $ 11,825 | $ (16,928)
Net available-for-sale securities losses reclassified into earnings | 34 | (41) | (5)
Adjustment to funded status of employee benefit plans | (3,551) | (13,394) | 18,299
Other Comprehensive Income (Loss), Before Tax | (4,180) | (1,610) | 1,366
Tax (Expense) Benefit |  |  |
Net change in unrealized gains on securities available-for-sale, Tax (Expense) Benefit | 232 | (4,139) | 5,925
Net available-for-sale securities gains reclassified into earnings, Tax (Expense) Benefit | (12) | 15 | 2
Adjustment to funded status of employee benefit plans, Tax (Expense) Benefit | 1,336 | 4,595 | (6,405)
Income tax benefit (expense) related to items of other comprehensive income | 1,556 | 471 | (478)
Net of Tax Amount |  |  |
Net change in unrealized gains on securities available-for-sale, Net of Tax Amount | (431) | 7,686 | (11,003)
Net available-for-sale securities gains reclassified into earnings, Net of Tax Amount | 22 | (26) | (3)
Adjustment to funded status of employee benefit plans, Net of Tax Amount | (2,215) | (8,799) | 11,894
Other Comprehensive Income (Loss), After Tax | $ (2,624) | $ (1,139) | $ 888

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