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SHARE-BASED COMPENSATION PLANS - Information Pertaining to Options Outstanding and Exercisable (Details) - Orrstown 2011 Incentive Stock Plan - Employee Stock Option	9 Months Ended
	Sep. 30, 2017 $ / shares shares
$21.14 - $24.99
Range of Exercise Prices
Range of Exercise Prices, Minimum (in usd per share)	$ 21.14
Range of Exercise Prices, Maximum (in usd per share)	$ 24.99
Number Outstanding (in shares) | shares	33,899
Weighted Average Remaining Contractual Life (Years)	2 years 7 months 24 days
Weighted Average Exercise Price (in usd per share)	$ 21.48
$25.00 - $29.99
Range of Exercise Prices
Range of Exercise Prices, Minimum (in usd per share)	25.00
Range of Exercise Prices, Maximum (in usd per share)	$ 29.99
Number Outstanding (in shares) | shares	2,792
Weighted Average Remaining Contractual Life (Years)	2 years 6 months
Weighted Average Exercise Price (in usd per share)	$ 25.76
$30.00 - $34.99
Range of Exercise Prices
Range of Exercise Prices, Minimum (in usd per share)	30.00
Range of Exercise Prices, Maximum (in usd per share)	$ 34.99
Number Outstanding (in shares) | shares	15,744
Weighted Average Remaining Contractual Life (Years)	8 months 23 days
Weighted Average Exercise Price (in usd per share)	$ 30.10
$35.00 - $37.59
Range of Exercise Prices
Range of Exercise Prices, Minimum (in usd per share)	35.00
Range of Exercise Prices, Maximum (in usd per share)	$ 37.59
Number Outstanding (in shares) | shares	7,348
Weighted Average Remaining Contractual Life (Years)	1 year 9 months 22 days
Weighted Average Exercise Price (in usd per share)	$ 37.08
$21.14 - $37.59
Range of Exercise Prices
Range of Exercise Prices, Minimum (in usd per share)	21.14
Range of Exercise Prices, Maximum (in usd per share)	$ 37.59
Number Outstanding (in shares) | shares	59,783
Weighted Average Remaining Contractual Life (Years)	2 years 11 days
Weighted Average Exercise Price (in usd per share)	$ 25.87

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ 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)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
-Paragraph 2
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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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