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SHARE-BASED COMPENSATION PLANS - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	May 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of treasury stock, shares			15,334
Orrstown 2011 Incentive Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved to be issued						381,920
Number of shares available to be issued under employee stock purchase plan	132,945		132,945
Orrstown 2011 Incentive Stock Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense on restricted stock awards	$ 266,000	$ 229,000	$ 762,000	$ 525,000
Tax benefits from compensation expense	85,000	$ 80,000	259,000	$ 184,000
Unrecognized compensation expense	2,321,000		$ 2,321,000		$ 2,293,000
Unrecognized compensation expense, recognition period			2 years 6 months 26 days
Intrinsic value of restricted share awards that vested during period			$ 237,000
Orrstown 2011 Incentive Stock Plan | Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options outstanding and exercisable	$ 0		$ 0		$ 0
Orrstown 2011 Incentive Stock Plan | Employee Stock Option | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term to exercise option			10 years
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved to be issued	350,000		350,000
Number of shares available to be issued under employee stock purchase plan	186,004		186,004
Maximum shares purchase, as percentage of salary	10.00%		10.00%
Percentage of value of the shares on the semi-annual offering			95.00%
Issuance of treasury stock, shares	3,873	3,341	6,334	6,305
Weighted average price (in usd per share)	$ 16.68	$ 15.91	$ 16.64	$ 15.83
Compensation expense recognized	$ 14,000	$ 5,000	$ 17,000	$ 8,000

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Weighted average purchase price of capital shares purchased through an employee stock ownership plan.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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