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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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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