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ORRSTOWN FINANCIAL SERVICES, INC. (PARENT COMPANY ONLY) FINANCIAL INFORMATION - Condensed Statements of Comprehensive Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), net of tax and reclassification adjustments | $ (377) | $ 6,389 | $ (6,641)
Total comprehensive income | 7,497 | 35,531 | 3,363
Parent Company |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Income (loss) before equity in undistributed income of subsidiary | 16,414 | (790) | (1,015)
Unrealized holding gains (losses) on securities available for sale arising during the period, net of tax | 4 | (1) | 0
Total other comprehensive income (loss), net of tax and reclassification adjustments | 4 | (1) | 0
Comprehensive income (loss) before equity in undistributed income and other comprehensive income of subsidiary | 16,418 | (791) | (1,015)
Equity in undistributed income and other comprehensive income of subsidiary | (8,921) | 36,322 | 4,378
Total comprehensive income | $ 7,497 | $ 35,531 | $ 3,363

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