See accompanying Notes to Consolidated Financial Statements (unaudited)

The terms “FNB,” “the Corporation,” “we,” “us” and “our” throughout this Report mean F.N.B. Corporation and our consolidated subsidiaries, unless the context indicates that we refer only to the parent company, F.N.B. Corporation. When we refer to "FNBPA" in this Report, we mean our bank subsidiary, First National Bank of Pennsylvania, and its subsidiaries.

F.N.B. Corporation, headquartered in Pittsburgh, Pennsylvania, is a diversified financial services company operating in 7 states and the District of Columbia. Our market coverage spans several major metropolitan areas including: Pittsburgh, Pennsylvania; Baltimore, Maryland; Cleveland, Ohio; Washington, D.C.; and Charlotte, Raleigh, Durham and the Piedmont Triad (Winston-Salem, Greensboro and High Point) in North Carolina. As of March 31,June 30, 2020, we had 369353 banking offices throughout Pennsylvania, Ohio, Maryland, West Virginia, North Carolina, South Carolina and Virginia.

We provide a full range of commercial banking, consumer banking and wealth management solutions through our subsidiary network which is led by our largest affiliate, FNBPA, founded in 1864. Commercial banking solutions include corporate banking, small business banking, investment real estate financing, government banking, business credit, capital markets and lease financing. Consumer banking provides a full line of consumer banking products and services, including deposit products, mortgage lending, consumer lending and a complete suite of mobile and online banking services. Wealth management services include asset management, private banking and insurance.

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 VIE in which we have the power to direct the activities of an entity that most significantly impact the entity’s economic performance and hashave an obligation to absorb losses or the right to receive benefits from the VIE which could potentially be significant to the VIE, are consolidated. For a voting interest entity, a controlling financial interest is generally where we hold more than 50% of the outstanding voting shares. 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,June 30, 2020 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.

Our 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 ACL, accounting for loans acquired in a business combination prior to January 1, 2020, fair value of financial instruments, goodwill and other intangible assets, income taxes and deferred tax assets.

On January 1, 2020, we adopted ASU 2016-13, Financial Instruments-Credit Losses (Topic 326), which replaces the incurred credit loss impairment methodology with a methodology that reflects lifetime current expected credit losses (commonly referred to as CECL) for most financial assets measured at amortized cost, including loans, HTM debt securities, net investment in leases and certain off-balance sheet credit exposure. We adopted CECL using the modified retrospective method for financial assets measured at amortized cost, net investments in leases and off-balance sheet credit exposures. As a result, we recorded a reduction of $50.6 million in retained earnings as of January 1, 2020 for the cumulative effect of the adoption. The transition adjustment was primarily driven by longer duration commercial and consumer real estate loans. Results for reporting periods prior to January 1, 2020 continue to be reported in accordance with previously applicable GAAP.

We used the prospective transition method for PCD financial assets that were previously classified as PCI and accounted for under ASC 310-30, including loans accounted for by analogy under ASC 310-30. In accordance with the transition guidance, we did not reassess whether PCI assets met the criteria for PCD assets nor did we reassess whether modifications to individual acquired financial assets previously accounted for in pools were TDRs as of the date of adoption. We discontinued the use of pools beyond transition accounting and account for these loans on an individual loan basis. After transition, loans previously accounted for in pools are grouped with other loans with similar risk characteristics for purposes of estimating expected credit losses. As a result, beginning in 2020 certain credit metrics and ratios which previously excluded PCI loans now include PCD loans. On January 1, 2020, the amortized cost basis of the PCD assets was adjusted to reflect the addition of an ACL for $50.3 million. The net noncredit discount, after the adjustment for the ACL, will be accreted into interest income at the loan’s effective interest rate over the remaining contractual life.

We made an accounting policy election to write-off accrued interest receivable balances by reversing interest income in accordance with our non-accrual policies instead of measuring an ACL for accrued interest receivable.receivable for all classes of financing receivables and major security types.

We do not hold any securities at adoption for which OTTI had been recognized prior to January 1, 2020.

The following table illustrates the impact of the adoption of ASC 326:

Debt securities comprise a significant portion of our Consolidated Balance Sheets. Such securities can be classified as trading, HTM or AFS. As of March 31,June 30, 2020 and December 31, 2019, we did not hold any trading debt securities. Interest income on debt securities includes amortization of purchase premiums or accretion of discounts. Premiums and discounts on debt securities are generally amortized on the level-yield method without anticipating prepayments, except for mortgage-backed securities where prepayments are anticipated. Premiums on callable debt securities are amortized to their earliest call date. A debt security is placed on non-accrual when principal or interest becomes greater than 90 days delinquent. Interest accrued but not received for a security placed on non-accrual is reversed against interest income. Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method.

HTM debt securities are securities that management has the positive intent and ability to hold until their maturity. Such securities are carried at amortized cost. Beginning in 2020, for certain HTM securities we have an expectation of zero expected credit losses. Based on a long history with no credit losses, high credit ratings, guarantees, and/or implied risk-free characteristics, we expect the nonpayment of our UST, Fannie Mae, Freddie Mac, FHLB, Ginnie Mae, and the SBA securities to be zero, and accordingly, have no ACL on those securities. We believe that these qualitative factors are indicators that historical credit loss information should be nominally impacted, if at all, by current conditions and reasonable and supportable forecasts. As such, we believe that without a change in these indicators, we may continue to assume zero credit losses on securities concluded to exhibit those factors. We also have a portfolio of HTM debt securities where we do not expect credit losses to be zero. This portfolio consists of high-grade municipal securities. To calculate the expected credit losses on these securities we group securities by major security type, rating and maturity and apply respective cumulative default rates from a third party data provider. The baseline credit loss estimate is adjusted using a qualitative approach to account for potential variability in probabilities of default data for current conditions and reasonable and supportable forecasts. Where available, expected credit losses take into consideration any enhancement a security has such as insurance or state aid.

Debt securities that are not classified as trading or HTM are classified as AFS and are carried at fair value. AFS debt securities in unrealized loss positions are evaluated for impairment related to credit losses at least quarterly. Impairment may result from credit deterioration of the issuer or collateral underlying the security. In performing an assessment of whether any decline in fair value is due to a credit loss, all relevant information is considered at the individual security level.

Beginning in 2020, for AFS debt securities in an unrealized loss position, we first determine whether we have the intent to sell, or it is more likely than not that we will be required to sell, the security before recovery of its amortized cost basis. If the criteria for intent or requirement to sell is met, the security’s amortized cost is written down to fair value and the write down is charged against the ACL with any incremental impairment reported in earnings in the Provision for Credit Losses line on the Consolidated Statements of Income. For AFS debt securities that do not meet the criteria for intent or requirement to sell, we evaluate whether the decline in fair value has resulted from credit losses or other factors. In assessing whether a credit loss exists on an individual security, weWe first qualitatively evaluate each security to assess whether a potential credit loss exists. If as a result of this qualitative analysis we expect to get all of our principal back, then we conclude that the present value of expected cash flows equals or exceeds its amortized cost and no credit loss exists. If it was determined a potential credit loss exists, we compare the present value of cash flows expected to be collected with our amortized cost basis to determine if a credit loss exists and to measure its value. The credit loss is recorded through ACL, limited to the amount the fair value is less than the amortized cost basis. We have made an accounting policy election for each major security type of AFS debt securities to adjust the effective interest rate used to discount expected cash flows to consider the timing of expected cash flows resulting from expected prepayments. Impairment for noncredit-related factors is recorded in OCI, net of income taxes.

Changes in the ACL are recorded as a provision for credit loss expense. Losses are charged against the ACL when an AFS debt security is not collectible or when we believe the criteria regarding the intent or requirement to sell is met.

Loans we intend to hold for the foreseeable future or until maturity or payoff are reported at amortized cost, net of the ACL. Amortized cost primarily consists of the principal balances outstanding, deferred origination fees or costs and premiums or discounts on purchased loans. Interest income on loans is computed over the term of the loans using the effective interest method. Loan origination fees or costs, premiums or discounts are deferred and amortized over the term of the loan or loan commitment period as an adjustment to the related loan yield.

We place loans on non-accrual status and discontinue interest accruals on loans generally when principal or interest is due and has remained unpaid for a certain number of days or when the full amount of principal and interest is due and has remained unpaid for a certain number of days, unless the loan is both well secured and in the process of collection. Commercial loans and leases are placed on non-accrual at 90 days, installment loans are placed on non-accrual at 120 days and residential mortgages and consumer lines of credit are generally placed on non-accrual at 180 days, though we may place a loan on non-accrual prior to these past due thresholds as warranted. When a loan is placed on non-accrual status, all unpaid accrued interest is reversed.reversed against interest income and the amortization of deferred fees and costs is suspended. Non-accrual loans may not be restored to accrual status until all delinquent principal and interest have been paid and the ultimate ability to collect the remaining principal and interest is reasonably assured. Loans are charged-off against the ACL and recoveries of amounts previously charged-off are credited to the ACL when realized.

We considered a loan impaired when, based on current information and events, it is probable that we would be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Factors considered in determining impairment included payment status, collateral value and the probability of collecting scheduled principal and interest payments when due. The impairment loss was measured by either the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price, or the fair value of the collateral, less estimated selling costs, if the loan was collateral dependent. Prior to 2020, PCI loans were not classified as non-performing assets as the loans were considered to be performing. Beginning in 2020, PCI loans previously accounted for in pools are grouped with other loans with similar risk characteristics for purposes of estimating expected credit losses and non-performing classification.

Debt restructurings or loan modifications for a borrower occur in the normal course of business and do not necessarily constitute TDRs. In general, the modification or restructuring of a debt constitutes a TDR, including reasonably expected TDR, if we for economic or legal reasons related to the borrower’s financial difficulties grant a concession to the borrower that we would not otherwise consider under current market conditions or once we have determined that a loan modification for a

TDR classification does not include short-term assistance to borrowers who are current at the time of a natural disaster or other extreme event (e.g. floods, hurricanes and pandemics). These borrowers are considered to not be experiencing financial difficulty at the time of modification, therefore not meeting the criteria for determining TDR status. For modifications of leases related to the effects of the COVID-19 pandemic and that do not result in a substantial increase in our rights as lessor or the obligations of the lessee, we elected to account for these lease concessions as though enforceable rights and obligations for those concessions existed in the original contracts. We will account for these concessions as if no changes were made to the lease contract.

We have purchased loans and leases, some of which have experienced more than insignificant credit deterioration since origination.

Beginning in 2020, we have established criteria to assess whether a purchased financial asset, or group of assets, should be accounted for as PCD on the acquisition date. The selection of which criteria to apply, or the addition of new criteria, to a specific acquisition will be based on the facts and circumstances at the time of review, as well as the availability of information supplied by the acquiree. Generally, more-than-insignificant deterioration in credit quality since origination would include risk ratings of special mention or below, inconsistency of loan payments, non-accrual status at the time of acquisition, loans modified in a TDR, in bankruptcy or supervisory for regulatory purposes.

PCD loans are recorded at the amount paid. The initial ACL is determined using the same methodology as other loans held for investment on a collective basis and is allocated to individual loans. The sum of the loan’s purchase price and the ACL becomes the initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a noncredit discount or premium, which is amortized or accreted into interest income over the life of the loan. Subsequent changes to the ACL are recorded through provision expense.

The following table summarizes accounting pronouncements issued by the FASB that we recently adopted.