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SHARE-BASED COMPENSATION PLANS - Summary of Outstanding Stock Options Activity (Details)	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Shares
Options exercisable (in shares) | shares	30,559
Weighted Average Exercise Price
Options exercisable at period end (in usd per share) | $ / shares	$ 21.56
Orrstown 2011 Incentive Stock Plan | Employee Stock Option
Shares
Outstanding at beginning of year (in shares) | shares	40,984
Expired (in shares) | shares	(10,425)
Options outstanding at period end (in shares) | shares	30,559
Weighted Average Exercise Price
Outstanding at beginning of year (in usd per share) | $ / shares	$ 24.34
Expired (in usd per share) | $ / shares	32.47
Options outstanding at period end (in usd per share) | $ / shares	$ 21.56

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

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.

+ References

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-Publisher FASB
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-Section 50
-Paragraph 2
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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
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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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- Definition

Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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