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SHARE-BASED COMPENSATION PLANS - Summary of Outstanding Stock Options Activity (Details)	6 Months Ended
	Jun. 30, 2018 $ / shares shares
Shares
Options exercisable at period end (in shares) | shares	58,403
Weighted Average Exercise Price
Options exercisable at period end (in usd per share) | $ / shares	$ 25.89
Orrstown 2011 Incentive Stock Plan | Employee Stock Option
Shares
Outstanding at beginning of year (in shares) | shares	59,583
Forfeited (in shares) | shares	(2,235)
Expired (in shares) | shares	(3,444)
Exercised (in shares) | shares	(1,150)
Options outstanding at period end (in shares) | shares	52,754
Weighted Average Exercise Price
Outstanding at beginning of year (in usd per share) | $ / shares	$ 25.89
Forfeited (in usd per share) | $ / shares	28.02
Expired (in usd per share) | $ / shares	30.44
Exercised (in usd per share) | $ / shares	21.14
Options outstanding at period end (in usd per share) | $ / shares	$ 25.60

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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.

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

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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 option holders acquired shares when converting their stock options into shares.

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