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Accumulated Other Comprehensive Loss - Reclassifications from Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Net securities losses (gains) reclassified into earnings | $ 55 | $ (696)
Related income tax (benefit) expense | 956 | 3,499
Total reclassifications | (2,655) | (7,631)
Amount Reclassified from Accumulated Other Comprehensive Loss [Member] | Securities Available for Sale [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Net securities losses (gains) reclassified into earnings | 55 | (696)
Related income tax (benefit) expense | (19) | 236
Total reclassifications | $ 36 | $ (460)

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