SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	9 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Sep. 30, 2019
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES See the Glossary of Defined Terms at the beginning of this Report for terms used throughout the consolidated financial statements and related notes of this Form 10-Q. Nature of Operations – Orrstown Financial Services, Inc. and subsidiaries is a financial holding company that operates Orrstown Bank, a commercial bank with banking and financial advisory offices in Berks, Cumberland, Dauphin, Franklin, Lancaster, Perry and York Counties, Pennsylvania, and in Anne Arundel, Baltimore, Howard and Washington Counties, Maryland, as well as Baltimore City, Maryland and Wheatland Advisors, Inc., a registered investment advisor non-bank subsidiary, headquartered in Lancaster County, Pennsylvania. The Company operates in the community banking segment and engages in lending activities, including commercial, residential, commercial mortgages, construction, municipal, and various forms of consumer lending, and deposit services, including checking, savings, time, and money market deposits. The Company also provides fiduciary services, investment advisory, insurance and brokerage services. The Company and the Bank are subject to regulation by certain federal and state agencies and undergo periodic examinations by such regulatory authorities. Basis of Presentation – The accompanying condensed consolidated financial statements include the accounts of Orrstown Financial Services, Inc. and its wholly owned subsidiaries, the Bank and Wheatland. The Company has prepared these unaudited condensed consolidated financial statements in accordance with GAAP for interim financial information, SEC rules that permit reduced disclosure for interim periods, and Article 10 of Regulation S-X. In the opinion of management, all adjustments (all of which are of a normal recurring nature) that are necessary for a fair statement are reflected in the unaudited condensed consolidated financial statements. The December 31, 2018 consolidated balance sheet information contained in this Quarterly Report on Form 10-Q was derived from the 2018 audited consolidated financial statements. Interim results are not necessarily indicative of results for a full year. The unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements, including the notes thereto, included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018. Operating results for the three and nine months ended September 30, 2019 are not necessarily indicative of the results that may be expected for the year ending December 31, 2019. All significant intercompany transactions and accounts have been eliminated. Certain reclassifications may have been made to prior year amounts to conform with current year classifications. The Company's management has evaluated all activity of the Company and concluded that subsequent events are properly reflected in the Company's consolidated financial statements and notes as required by GAAP. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change include the determination of the ALL and those used in valuation methodologies in areas with no observable market, such as loans, deposits, borrowings, goodwill, core deposit and other intangible assets, other assets and liabilities obtained or assumed in business combinations. Leases - We evaluate our contracts at inception to determine if an arrangement is or contains a lease. Operating leases are included in operating lease ROU assets in Other assets and operating lease liabilities in Accrued interest payable and other liabilities in our consolidated balance sheets. The Company has no finance leases. ROU assets represent our right to use an underlying asset for the lease term, and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. Our leases do not provide an implicit rate, so we use our incremental borrowing rate, which approximates our fully collateralized borrowing rate, based on the information available at commencement date in determining the present value of lease payments. The incremental borrowing rate is reevaluated upon lease modification. The operating lease ROU asset also includes any initial direct costs and prepaid lease payments made less any lease incentives. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. We adopted ASU 2016-02, “Leases (Topic 842),” on January 1, 2019, the effective date of the guidance, using the practical expedient transition method whereby we did not revise comparative period information or disclosure. The new standard requires lessees to record assets and liabilities on the balance sheet for all leases with terms longer than 12 months. We elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allows us to carryforward the historical lease classification. We also elected certain optional practical expedients, including the hindsight practical expedient under which we considered the actual outcomes of lease renewals and terminations when measuring the lease term at adoption, and we made an accounting policy election to keep leases with an initial term of 12 months or less off of the balance sheet. We recognize these lease payments in the consolidated statements of income on a straight-line basis over the lease term. We have lease agreements with lease and non-lease components, and we have elected the practical expedient to account for these as a single lease component. Our operating leases relate primarily to bank branches and office space. In conjunction with the adoption on January 1, 2019, we recognized operating lease liabilities of $7,971,000 and related lease assets of $7,494,000 on our balance sheet. The difference between the lease assets and lease liabilities primarily consists of deferred rent liabilities reclassified upon adoption to reduce the measurement of the lease assets. The standard did not materially impact our consolidated net income and had no impact on cash flows. Recent Accounting Pronouncements - ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The amendments in this update require an organization to measure all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will use forward-looking information to better inform their credit loss estimates. Many of the loss estimation techniques applied today will still be permitted, although the inputs to those techniques will change to reflect the full amount of expected credit losses. Organizations will continue to use judgment to determine which loss estimation method is appropriate for their circumstances. Additionally, the amendments in this update amend the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. For certain public companies, this update will be effective for interim and annual periods beginning after December 15, 2019. On October 16, 2019, the FASB extended the implementation deadline for smaller reporting and other companies until the fiscal year and interim periods beginning after December 15, 2022. The Company currently meets the requirements to be considered a smaller reporting company under SEC Regulation S-K and SEC Rule 405, and, pending the issuance of a final pronouncement, is evaluating the impact of the delay for adoption of the update. We are working with a third party vendor solution to assist with the application of ASU 2016-13 and finalizing the loss estimation models to be used. Once management determines which methods will be utilized, a third party will be contracted to perform a model validation prior to adoption. While we anticipate the allowance for loan losses will increase under our current assumptions, we expect the impact of adopting ASU 2016-13 will be influenced by the composition, characteristics and quality of our loan and securities portfolios, as well as general economic conditions and forecasts at the adoption date. ASU 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The update simplifies how all entities assess goodwill for impairment by eliminating Step 2 from the goodwill impairment test. As amended, the goodwill impairment test will consist of one step comparing the fair value of a reporting unit with its carrying amount. An entity should recognize a goodwill impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. ASU 2017-04 will be effective for the Company on January 1, 2020, with earlier adoption permitted, and is not expected to have a material impact on the Company's consolidated financial statements. ASU 2017-08, Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20). The update shortens the amortization period of certain callable debt securities held at a premium to the earliest call date unless applicable guidance related to certain pools of securities is applied to consider estimated prepayments. Under prior guidance, entities were generally required to amortize premiums on individual, non-pooled callable debt securities as a yield adjustment over the contractual life of the security. ASU 2017-08 does not change the accounting for callable debt securities held at a discount. On January 1, 2019, we adopted ASU 2016-18 with no material impact on our consolidated financial condition or results of operations. In August 2018, the SEC adopted the final rule under SEC Release No. 33-10532, Disclosure Update and Simplification, amending certain disclosure requirements. In addition, the amendments expanded the disclosure requirements on the analysis of stockholders' equity for interim financial statements. Under the amendments, an analysis of changes in each caption of stockholders' equity presented in the balance sheet must be provided in a note or separate statement and should present a reconciliation of the beginning balance to the ending balance for each period for which a statement of comprehensive income is presented. The Company implemented the additional disclosure requirements effective with the filing of its March 31, 2019 Form 10-Q.