SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	6 Months Ended
Jun. 30, 2020
Accounting Policies [Abstract]
Nature of Operations	Nature of Operations – Orrstown Financial Services, Inc. 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 Wheatland operations were discontinued effective July 31, 2020. 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	Basis of Presentation – The accompanying unaudited 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, 2019 consolidated balance sheet information contained in this Quarterly Report on Form 10-Q was derived from the Company's 2019 audited consolidated financial statements. 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, 2019. Operating results for the three and six months ended June 30, 2020 are not necessarily indicative of the results that may be expected for the year ending December 31, 2020. 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 unaudited condensed 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. The effects of the COVID-19 pandemic may negatively impact material 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, mortgage servicing rights, other assets and liabilities obtained or assumed in business combinations.
Derivatives	Derivatives - FASB ASC 815, Derivatives and Hedging (“ASC 815”), provides the disclosure requirements for derivatives and hedging activities with the intent to provide users of financial statements with an enhanced understanding of: (a) how and why an entity uses derivative instruments, (b) how the entity accounts for derivative instruments and related hedged items, and (c) how derivative instruments and related hedged items affect an entity’s financial position, financial performance, and cash flows. Further, qualitative disclosures are required that explain the Company’s objectives and strategies for using derivatives, as well as quantitative disclosures about the fair value of and gains and losses on derivative instruments, and disclosures about credit-risk-related contingent features in derivative instruments. As required by ASC 815, the Company records all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge. The Company may enter into derivative contracts that are intended to economically hedge certain of its risk, even though hedge accounting does not apply or the Company elects not to apply hedge accounting. The Company's objectives in using interest rate derivatives are to add stability to interest income and to manage its exposure to interest rate movements. To accomplish this objective, the Company primarily uses interest rate swaps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of fixed amounts from a counterparty in exchange for the Company making variable-rate payments over the life of the agreements without exchange of the underlying notional amount. The Company may enter into derivative contracts that are intended to economically hedge certain of its risk, even though hedge accounting does not apply or the Company elects not to apply hedge accounting. Changes to the fair value of derivatives designated and that qualify as cash flow hedges are recorded in accumulated other comprehensive income and are subsequently reclassified into earnings in the period that the hedged transaction affects earnings. During the six months ended June 30, 2020, such derivatives were used to hedge the variable cash flows associated with overnight borrowings. Derivatives not designated as hedges are not speculative and result from a service the Company provides to certain customers. The Company executes interest rate swaps with commercial banking customers to facilitate their respective risk management strategies. Those interest rate swaps are simultaneously hedged by offsetting derivatives that the Company executes with a third party, such that the Company minimizes its net risk exposure resulting from such transactions. As the interest rate derivatives associated with this program do not meet the strict hedge accounting requirements, changes in the fair value of both the customer derivatives and the offsetting derivatives are recognized directly in earnings.
Leases	Leases - The Company evaluates its contracts at inception to determine if an arrangement either is a lease or contains one. Operating lease ROU assets are included in other assets and operating lease liabilities in accrued interest payable and other liabilities in the unaudited condensed consolidated balance sheets. The Company had no finance leases at June 30, 2020. ROU assets represent the right to use an underlying asset for the lease term, and lease liabilities represent an 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. The Company's leases do not provide an implicit rate, so the Company's incremental borrowing rate is used, which approximates its 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. The Company's lease terms may include options to extend or terminate the lease when it is reasonably certain that it will exercise that option. In accordance with ASU 2016-02, “Leases (Topic 842)” (“ASU 2016-02”), the Company keeps leases with an initial term of 12 months or less off of the balance sheet. The Company recognizes these lease payments in the unaudited condensed consolidated statements of income on a straight-line basis over the lease term. The Company has lease agreements with lease and non-lease components and has elected the practical expedient to account for them as a single lease component. The Company's operating leases relate primarily to bank branches and office space. Upon the adoption of ASU 2016-02 on January 1, 2019, operating lease liabilities of $10.5 million and related lease assets of $7.5 million were recognized on the unaudited condensed consolidated balance sheets. 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.
Recent Accounting Pronouncements	Recent Accounting Pronouncements - ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ("ASU 2016-13"). 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 was effective for interim and annual periods beginning after December 15, 2019. The Company delayed the adoption of ASU 2016-13 as noted below. ASU No. 2019-10, Financial Instruments—Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842): Effective Dates ("ASU 2019-10"), extended the implementation deadline of ASU 2016-13 for smaller reporting and other companies until the fiscal year and interim periods beginning after December 15, 2022. The Company meets the requirements to be considered a smaller reporting company under SEC Regulation S-K and SEC Rule 405, and did not adopt ASU 2016-13 on January 1, 2020. The Company is evaluating the impact of the delay for adoption of ASU 2016-13. The Company is 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 the Company anticipates the allowance for loan losses will increase under its current assumptions, it expects the impact of adopting ASU 2016-13 will be influenced by the composition, characteristics and quality of its loan and securities portfolios, as well as general economic conditions and forecasts at the adoption date. The other provisions of ASU 2019-10 were not applicable to the Company. In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting ("ASU 2020-04). ASU 2020-04 contains optional expedients and exceptions for applying generally accepted accounting principles to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another reference rate expected to be discontinued. The optional expedients apply consistently to all contracts or transactions within the scope of this topic, while the optional expedients for hedging relationships can be elected on an individual basis. The Company has formed a cross-functional working group to lead the transition from LIBOR to a planned adoption of an alternate index. The Company has not yet determined what index will replace LIBOR in its loan agreements. The Company is in the process of implementing fallback language for loans that will mature after 2021. The Company expects to adopt the LIBOR transition relief allowed under this standard, and is currently evaluating the potential impact of this guidance on its financial statements.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

6 Months Ended

Jun. 30, 2020

Nature of Operations – Orrstown Financial Services, Inc. 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 Wheatland operations were discontinued effective July 31, 2020. 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

Basis of Presentation – The accompanying unaudited 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, 2019 consolidated balance sheet information contained in this Quarterly Report on Form 10-Q was derived from the Company's 2019 audited consolidated financial statements. 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, 2019. Operating results for the three and six months ended June 30, 2020 are not necessarily indicative of the results that may be expected for the year ending December 31, 2020. 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 unaudited condensed 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. The effects of the COVID-19 pandemic may negatively impact material 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, mortgage servicing rights, other assets and liabilities obtained or assumed in business combinations.

Derivatives

Derivatives - FASB ASC 815, Derivatives and Hedging (“ASC 815”), provides the disclosure requirements for derivatives and hedging activities with the intent to provide users of financial statements with an enhanced understanding of: (a) how and why an entity uses derivative instruments, (b) how the entity accounts for derivative instruments and related hedged items, and (c) how derivative instruments and related hedged items affect an entity’s financial position, financial performance, and cash flows. Further, qualitative disclosures are required that explain the Company’s objectives and strategies for using derivatives, as well as quantitative disclosures about the fair value of and gains and losses on derivative instruments, and disclosures about credit-risk-related contingent features in derivative instruments.

As required by ASC 815, the Company records all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair

value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge.

The Company may enter into derivative contracts that are intended to economically hedge certain of its risk, even though hedge accounting does not apply or the Company elects not to apply hedge accounting. The Company's objectives in using interest rate derivatives are to add stability to interest income and to manage its exposure to interest rate movements. To accomplish this objective, the Company primarily uses interest rate swaps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of fixed amounts from a counterparty in exchange for the Company making variable-rate payments over the life of the agreements without exchange of the underlying notional amount. The Company may enter into derivative contracts that are intended to economically hedge certain of its risk, even though hedge accounting does not apply or the Company elects not to apply hedge accounting.

Changes to the fair value of derivatives designated and that qualify as cash flow hedges are recorded in accumulated other comprehensive income and are subsequently reclassified into earnings in the period that the hedged transaction affects earnings. During the six months ended June 30, 2020, such derivatives were used to hedge the variable cash flows associated with overnight borrowings.

Derivatives not designated as hedges are not speculative and result from a service the Company provides to certain customers. The Company executes interest rate swaps with commercial banking customers to facilitate their respective risk management strategies. Those interest rate swaps are simultaneously hedged by offsetting derivatives that the Company executes with a third party, such that the Company minimizes its net risk exposure resulting from such transactions. As the interest rate derivatives associated with this program do not meet the strict hedge accounting requirements, changes in the fair value of both the customer derivatives and the offsetting derivatives are recognized directly in earnings.

Leases

Leases - The Company evaluates its contracts at inception to determine if an arrangement either is a lease or contains one. Operating lease ROU assets are included in other assets and operating lease liabilities in accrued interest payable and other liabilities in the unaudited condensed consolidated balance sheets. The Company had no finance leases at June 30, 2020.

ROU assets represent the right to use an underlying asset for the lease term, and lease liabilities represent an 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. The Company's leases do not provide an implicit rate, so the Company's incremental borrowing rate is used, which approximates its 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. The Company's lease terms may include options to extend or terminate the lease when it is reasonably certain that it will exercise that option.

In accordance with ASU 2016-02, “Leases (Topic 842)” (“ASU 2016-02”), the Company keeps leases with an initial term of 12 months or less off of the balance sheet. The Company recognizes these lease payments in the unaudited condensed consolidated statements of income on a straight-line basis over the lease term. The Company has lease agreements with lease and non-lease components and has elected the practical expedient to account for them as a single lease component.

The Company's operating leases relate primarily to bank branches and office space. Upon the adoption of ASU 2016-02 on January 1, 2019, operating lease liabilities of $10.5 million and related lease assets of $7.5 million were recognized on the unaudited condensed consolidated balance sheets. 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.

Recent Accounting Pronouncements

Recent Accounting Pronouncements - ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ("ASU 2016-13"). 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 was effective for interim and annual periods beginning after December 15, 2019. The Company delayed the adoption of ASU 2016-13 as noted below.

ASU No. 2019-10, Financial Instruments—Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842): Effective Dates ("ASU 2019-10"), extended the implementation deadline of ASU 2016-13 for smaller reporting and other companies until the fiscal year and interim periods beginning after December 15, 2022. The Company meets the

requirements to be considered a smaller reporting company under SEC Regulation S-K and SEC Rule 405, and did not adopt ASU 2016-13 on January 1, 2020. The Company is evaluating the impact of the delay for adoption of ASU 2016-13. The Company is 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 the Company anticipates the allowance for loan losses will increase under its current assumptions, it expects the impact of adopting ASU 2016-13 will be influenced by the composition, characteristics and quality of its loan and securities portfolios, as well as general economic conditions and forecasts at the adoption date. The other provisions of ASU 2019-10 were not applicable to the Company.

In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting ("ASU 2020-04). ASU 2020-04 contains optional expedients and exceptions for applying generally accepted accounting principles to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another reference rate expected to be discontinued. The optional expedients apply consistently to all contracts or transactions within the scope of this topic, while the optional expedients for hedging relationships can be elected on an individual basis. The Company has formed a cross-functional working group to lead the transition from LIBOR to a planned adoption of an alternate index. The Company has not yet determined what index will replace LIBOR in its loan agreements. The Company is in the process of implementing fallback language for loans that will mature after 2021. The Company expects to adopt the LIBOR transition relief allowed under this standard, and is currently evaluating the potential impact of this guidance on its financial statements.