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SHARE-BASED COMPENSATION PLANS - Summary of Outstanding Stock Options (Detail) - Employee Stock Option - Orrstown 2011 Incentive Stock Plan	9 Months Ended
	Sep. 30, 2015 $ / shares shares
Stock Options, Number of Shares
Outstanding at beginning of year (in shares)	148,193
Forfeited (in shares)	(18,813)
Expired (in shares)	(27,600)
Options outstanding and exercisable, at period end (in shares)	101,780
Stock Options, Weighted Average Exercise Price
Outstanding at beginning of year (in usd per share) | $ / shares	$ 31.18
Forfeited (in usd per share) | $ / shares	31.67
Expired (in usd per share) | $ / shares	39.93
Options outstanding and exercisable, at period end (in usd per share) | $ / shares	$ 28.72

X

- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (c)(1)(iv)(3)-(4)



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Weighted average price of options that were either forfeited or expired.

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-Publisher FASB



-Name Accounting Standards Codification



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-SubTopic 10



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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

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-Publisher FASB



-Name Accounting Standards Codification



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-SubTopic 10



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-Subparagraph (c)(1)(iv)(3)



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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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