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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, 2018 $ / 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	31,519
Weighted Average Remaining Contractual Life (Years)	1 year 7 months 24 days
Weighted Average Exercise Price (in usd per share)	$ 21.51
$25.00 - $34.99
Range of Exercise Prices
Range of Exercise Prices, Minimum (in usd per share)	25.00
Range of Exercise Prices, Maximum (in usd per share)	$ 34.99
Number Outstanding (in shares) | shares	2,792
Weighted Average Remaining Contractual Life (Years)	1 year 6 months
Weighted Average Exercise Price (in usd per share)	$ 25.76
$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	6,673
Weighted Average Remaining Contractual Life (Years)	9 months 22 days
Weighted Average Exercise Price (in usd per share)	$ 37.10
$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	40,984
Weighted Average Remaining Contractual Life (Years)	1 year 6 months
Weighted Average Exercise Price (in usd per share)	$ 24.34

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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.

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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.

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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.

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