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SHARE-BASED COMPENSATION PLANS - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of treasury stock, shares	53,367	2,461
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	92,966
Orrstown 2011 Incentive Stock Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense on restricted stock awards	$ 296	$ 237
Tax benefits from compensation expense	101	$ 83
Unrecognized compensation expense	$ 2,762		$ 2,169
Unrecognized compensation expense, recognition period	2 years 5 months 9 days
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	$ 38		$ 39
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
Number of shares available to be issued under employee stock purchase plan	182,890
Maximum shares purchase, as percentage of salary	10.00%
Percentage of value of the shares on the semi-annual offering	95.00%
Issuance of treasury stock, shares	3,114	2,461
Weighted average price (in usd per share)	$ 19.71	$ 16.57
Compensation expense recognized	$ 7	$ 3

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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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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-Publisher FASB
-Name Accounting Standards Codification
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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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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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