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SHARE-BASED COMPENSATION PLANS - Information Pertaining to Outstanding and Exercisable Options (Detail) - Orrstown 2011 Incentive Stock Plan - Employee Stock Option	9 Months Ended
	Sep. 30, 2015 $ / shares shares
Range of Exercise Prices
Range of Exercise Prices, Minimum (in usd per share)	$ 21.14
Range of Exercise Prices, Maximum (in usd per share)	$ 37.58
Number Outstanding (in shares) | shares	101,780
Weighted Average Remaining Contractual Life (Years)	2 years 11 months 27 days
Weighted Average Exercise Price (in usd per share)	$ 28.72
$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	36,824
Weighted Average Remaining Contractual Life (Years)	4 years 7 months 28 days
Weighted Average Exercise Price (in usd per share)	$ 21.46
$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)	4 years 6 months 4 days
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	39,620
Weighted Average Remaining Contractual Life (Years)	2 years 11 days
Weighted Average Exercise Price (in usd per share)	$ 31.28
$35.00 - $39.99
Range of Exercise Prices
Range of Exercise Prices, Minimum (in usd per share)	35.00
Range of Exercise Prices, Maximum (in usd per share)	$ 39.99
Number Outstanding (in shares) | shares	22,544
Weighted Average Remaining Contractual Life (Years)	1 year 9 months 7 days
Weighted Average Exercise Price (in usd per share)	$ 36.44

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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 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.

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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 exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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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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