SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

3 Months Ended

Mar. 31, 2019

Our accompanying Consolidated Financial Statements and these Notes to Consolidated Financial Statements (unaudited) include subsidiaries in which we have a controlling financial interest. We own and operate FNBPA, First National Trust Company, First National Investment Services Company, LLC, F.N.B. Investment Advisors, Inc., First National Insurance Agency, LLC, Bank Capital Services, LLC and F.N.B. Capital Corporation, LLC, and include results for each of these entities in the accompanying Consolidated Financial Statements.

Companies in which we hold more than a 50% voting equity interest, or a controlling financial interest, or are a variable interest entity (VIE) in which we have the power to direct the activities of an entity that most significantly impact the entity’s economic performance and has an obligation to absorb losses or the right to receive benefits from the VIE which could potentially be significant to the VIE are consolidated. VIEs in which we do not hold the power to direct the activities of the entity that most significantly impact the entity’s economic performance or does not have an obligation to absorb losses or the right to receive benefits from the VIE which could potentially be significant to the VIE are not consolidated. Investments in companies that are not consolidated are accounted for using the equity method when we have the ability to exert significant influence. Investments in private investment partnerships that are accounted for under the equity method or the cost method are included in other assets and our proportional interest in the equity investments’ earnings are included in other non-interest income. Investment interests accounted for under the cost and equity methods are periodically evaluated for impairment.

The accompanying interim unaudited Consolidated Financial Statements include all adjustments that are necessary, in the opinion of management, to fairly reflect our financial position and results of operations in accordance with GAAP. All significant intercompany balances and transactions have been eliminated. Certain prior period amounts have been reclassified to conform to the current period presentation. Such reclassifications had no impact on our net income and stockholders’ equity. Events occurring subsequent to March 31, 2019 have been evaluated for potential recognition or disclosure in the Consolidated Financial Statements through the date of the filing of the Consolidated Financial Statements with the Securities and Exchange Commission.

Certain information and Note disclosures normally included in Consolidated Financial Statements prepared in accordance with GAAP have been condensed or omitted pursuant to the rules and regulations of the SEC. The interim operating results are not necessarily indicative of operating results FNB expects for the full year. These interim unaudited Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and Notes thereto included in our 2018 Annual Report on Form 10-K filed with the SEC on February 26, 2019. For a detailed description of our significant

accounting policies, see Note 1 "Summary of Significant Accounting Policies" in our 2018 Annual Report on Form 10-K. The accounting policies presented below have been added or amended for newly material items or the adoption of new accounting standards.

Use of Estimates

Use of EstimatesOur accounting and reporting policies conform with GAAP. The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the amounts reported in the Consolidated Financial Statements and accompanying Notes to Consolidated Financial Statements (unaudited). Actual results could materially differ from those estimates. Material estimates that are particularly susceptible to significant changes include the allowance for credit losses, accounting for loans acquired in a business combination, fair value of financial instruments, goodwill and other intangible assets, litigation, income taxes and deferred tax assets.

Derivative Instruments and Hedging Activities

From time to time, we may enter into derivative transactions principally to protect against the risk of adverse price or interest rate movements on the value of certain assets and liabilities and on future cash flows. All derivative instruments are carried at fair value on the Consolidated Balance Sheets as either an asset or liability. Accounting for the changes in fair value of a derivative is dependent upon whether it has been designated in a formal, qualifying hedging relationship. For derivatives in qualifying hedging relationships, we formally document all relationships between hedging instruments and hedged items, as well as our risk management objective and strategy for undertaking each hedge transaction. Cash flows from hedging activities are classified in the same category as the items hedged.

Beginning in the first quarter of 2019, we adopted ASU 2017-12 which provides targeted improvements to the hedge accounting model that more closely aligns the accounting and reporting for hedging relationships with risk management activities. In addition, ASU 2017-12 provides administrative relief by easing documentation requirements, simplifying the application of hedge accounting by expanding the application of the shortcut method, eliminating the separate measurement and reporting of hedge ineffectiveness and generally requiring the entire effect of the hedging instrument and the hedged item to be presented in the same income statement line item. We believe these changes will provide users with more useful information about the effect of our risk management activities on the financial statements.

Changes in fair value of a derivative instrument that has been designated and qualifies as a cash flow hedge, including any ineffectiveness, are recorded in accumulated other comprehensive income, net of tax. Amounts are reclassified from AOCI to the consolidated statements of income in the same line item used to present the earnings effect of the hedged item in the period or periods in which the hedged transaction affects earnings. Prior to 2019, the ineffective portion, if any, was reported in earnings immediately.

At the hedge’s inception a formal assessment is performed to determine whether changes in the fair values or cash flows of the derivative instruments have been highly effective in offsetting changes in fair values or cash flows of the hedged items and whether they are expected to be highly effective in the future. At each reporting period thereafter, a statistical regression or qualitative analysis is performed to evaluate hedge effectiveness. If it is determined a derivative instrument has not been or will not continue to be highly effective as a hedge, hedge accounting is discontinued.

In addition, we enter into interest rate swap agreements to meet the financing, interest rate and equity risk management needs of qualifying commercial loan customers. These agreements provide the customer the ability to convert from variable to fixed interest rates. We then enter into positions with a derivative counterparty in order to offset our exposure on the fixed components of the customer agreements. The credit risk associated with derivatives executed with customers is essentially the same as that involved in extending loans and is subject to normal credit policies and monitoring. We seek to minimize counterparty credit risk by entering into transactions with only high-quality institutions. These arrangements meet the definition of derivatives, but are not designated as qualifying hedging relationships. The interest rate swap agreement with the loan customer and with the counterparty are reported at fair value in other assets and other liabilities on the Consolidated Balance Sheets with any resulting gain or loss recorded in current period earnings as other income.

Leases, lessee

We determine if an arrangement is, or contains, a lease at inception of the contract. As a lessee, we consider a contract to be, or contain, a lease if the contract conveys the right to control the use of an identified asset in exchange for consideration. We recognize in our Consolidated Balance Sheets the obligation to make lease payments and a right-of-use asset representing our right to use the underlying asset for the lease term. For an operating lease, the right-of-use asset and lease liability are included

in other assets and other liabilities, respectively. Finance leases are included in premises and equipment, and other liabilities. We do not record leases with an initial term of 12 months or less on the Balance Sheet, instead we recognize lease expense for leases with an initial term of 12 months or less on a straight-line basis over the lease term. For leases that commenced before January 1, 2019, we have applied the modified retrospective approach which resulted in comparative information not being restated. The new standard provides a number of optional practical expedients in transition. We elected the ‘package of practical expedients,’ which permits us to not reassess our prior conclusions about lease identification, lease classification and initial direct cost.

Right-of-use assets and liabilities are initially measured at the present value of lease payments over the lease term, discounted using the interest rate implicit in the lease at the commencement date. If the rate implicit in the lease cannot be readily determined, we discount the lease using our incremental borrowing rate which is derived by reference to FNB's secured borrowing rate. Our leases may include options to extend the lease. When it is reasonably certain that we will exercise an option, the lease term includes those periods. Lease expense is recognized on a straight-line basis over the lease term.

We have real estate lease agreements with lease and non-lease components, which are generally accounted for as a single lease component.

Leases, lessor

As a lessor, when a lease meets certain criteria indicating that we effectively have transferred control of the underlying asset to the customer, the lease is classified as a sales-type lease. When a lease does not meet the criteria for a sales-type lease but meets the criteria of a direct financing lease, the lease is classified as a direct financing lease. When none of the required criteria for sales-type lease or direct-financing lease are met, the lease is classified as an operating lease. Both sales-type leases and direct financing leases are recognized as a net investment in the lease. The net investment comprises the lease receivable including any residual value of the underlying asset that is guaranteed by the customer or any other third party unrelated to us and the unguaranteed residual value of the underlying asset. Operating lease income is recognized over the lease term on a straight-line basis. We do not evaluate whether sales taxes and similar taxes imposed by a governmental authority on lease transactions and collected by us are our primary obligation as owner of the underlying leased asset and exclude from lease income all taxes collected.

New Accounting Standards



Standard	Description	Required Date of Adoption	Financial Statements Impact
Derivative and Hedging Activities
ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities	This Update improves the financial reporting of hedging to better align with a company’s risk management activities. In addition, this Update makes certain targeted improvements to simplify the application of the current hedge accounting guidance.	January 1, 2019 Early adoption is permitted.	This Update was applied using a modified retrospective method. The presentation and disclosure guidance were applied prospectively. The adoption of this Update did not have a material effect on our Consolidated Financial Statements.
Securities
ASU 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities	This Update shortens the amortization period for the premium on certain purchased callable securities to the earliest call date. The accounting for purchased callable debt securities held at a discount does not change.	January 1, 2019 Early adoption is permitted.	This Update was applied using a modified retrospective transition method. The adoption of this Update did not have a material effect on our Consolidated Financial Statements.



Standard	Description	Required Date of Adoption	Financial Statements Impact
Credit Losses
ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ASU 2018-19, Codification Improvements to Topic 326, Financial Instruments - Credit Losses ASU 2019-04, Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments	These Updates replace the current incurred loss impairment methodology with a methodology that reflects current expected credit losses (commonly referred to as CECL) for most financial assets measured at amortized cost and certain other instruments, including loans, HTM debt securities, net investments in leases and off-balance sheet credit exposures. CECL requires loss estimates for the remaining life of the financial asset at the time the asset is originated or acquired, considering historical experience, current conditions and reasonable and supportable forecasts. In addition, the Update will require the use of a modified AFS debt security impairment model and eliminate the current accounting for purchased credit impaired loans and debt securities.	January 1, 2020 Early adoption is permitted for fiscal years beginning after December 15, 2018	These Updates are to be applied using a cumulative-effect adjustment to retained earnings. The CECL model is a significant change from existing GAAP and may result in a material change to our accounting for financial instruments and regulatory capital. We have created a cross-functional steering committee to govern implementation. We are in the process of implementing a new modeling platform and integrating other auxiliary models to support a calculation of expected credit losses under CECL. We have made preliminary decisions on segmentation and are finalizing other inputs necessary to execute parallel runs beginning in the second quarter of 2019 to ensure we are ready to calculate, review and report on our CECL allowance for credit losses for the first quarter of 2020. The impact of this Update will be dependent on the portfolio composition, credit quality and forecasts of economic conditions at the time of adoption.
Leases
ASU 2016-02, Leases (Topic 842) ASU 2018-10, Codification Improvements to Topic 842, Leases ASU 2018-11, Leases (Topic 842), Targeted Improvements ASU 2018-20, Leases (Topic 842), Narrow-Scope Improvements for Lessors ASU 2019-01, Lease (Topic 842), Codification Improvements	These Updates require lessees to put most leases on the Consolidated Balance Sheets but recognize expenses in the Consolidated Statements of Income similar to current accounting. In addition, the Update changes the guidance for sales-leaseback transactions, initial direct costs and lease executory costs for most entities. All entities will classify leases to determine how to recognize lease related revenue and expense.	January 1, 2019 Early adoption is permitted.	We adopted these Updates in the first quarter of 2019 under the modified retrospective approach. In addition, the new standard provides a number of optional practical expedients in transition. We elected the ‘package of practical expedients,’ which permits us to not reassess our prior conclusions about lease identification, lease classification and initial direct costs. Adoption of the new standard resulted in the recording of $116 million in right-of-use assets and corresponding lease liabilities of $126 million for operating leases on our Consolidated Balance Sheet. The standard did not materially impact our consolidated net earnings and had no impact on cash flows.