Financial Information	3 Months Ended
Mar. 31, 2017
Financial Information [Abstract]
Financial Information	Notes to the Consolidated Condensed Financial Statements (Unaudited) Note 1 – Financial Information Basis of Accounting. The unaudited interim consolidated condensed financial statements of First Horizon National Corporation (“FHN”), including its subsidiaries, have been prepared in conformity with accounting principles generally accepted in the United States of America and follow general practices within the industries in which it operates. This preparation requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. These estimates and assumptions are based on information available as of the date of the financial statements and could differ from actual results. In the opinion of management, all necessary adjustments have been made for a fair presentation of financial position and results of operations for the periods presented. These adjustments are of a normal recurring nature unless otherwise disclosed in this Quarterly Report on Form 10-Q. The operating results for the interim 2017 period are not necessarily indicative of the results that may be expected going forward. For further information, refer to the audited consolidated financial statements in Exhibit 13 to FHN’s Annual Report on Form 10-K for the year ended December 31, 2016. Summary of Accounting Changes. Effective January 1, 2017, FHN adopted the provisions of Accounting Standards Update (“ASU”) 2016-09, “Improvements to Employee Share-Based Payment Accounting,” which makes several revisions to equity compensation accounting. Under the new guidance all excess tax benefits and deficiencies that occur when an award vests, is exercised, or expires are recognized in income tax expense as discrete period items. Previously, these transactions were typically recorded directly within equity. Consistent with this change, excess tax benefits and deficiencies are no longer included within estimated proceeds when performing the treasury stock method for calculation of diluted earnings per share. Excess tax benefits are also recognized at the time an award is exercised or vests compared to the previous requirement to delay recognition until the deduction reduces taxes payable. The presentation of excess tax benefits in the statement of cash flows shifted to an operating activity from the prior classification as a financing activity. ASU 2016-09 also provides an accounting policy election to recognize forfeitures of awards as they occur when estimating stock-based compensation expense rather than the previous requirement to estimate forfeitures from inception. Further, ASU 2016-09 permits employers to use a net-settlement feature to withhold taxes on equity compensation awards up to the maximum statutory tax rate without affecting the equity classification of the award. Under previous guidance, withholding of equity awards in excess of the minimum statutory requirement resulted in liability classification for the entire award. The related cash remittance by the employer for employee taxes is treated as a financing activity in the statement of cash flows. Transition to the new guidance was accomplished through a combination of retrospective (cash flows), cumulative-effect adjustment to equity (forfeitures) and prospective methodologies (tax windfalls and shortfalls). FHN estimates, based on currently enacted tax rates, that adoption of ASU 2016-09 in 2017 will result in an incremental effect on tax provision ranging from $3.0 million of tax benefit to $1.0 million of additional tax provision. The actual effects of adoption in 2017 will primarily depend upon the share price of the FHN’s common stock, which affects the vesting of certain performance awards, probability of exercise of certain stock options and the magnitude of windfalls for all awards upon either vesting or exercise. The effects on earnings per share calculations and election to account for forfeitures as incurred have not been significant. Effective January 1, 2017, FHN early adopted the provisions of ASU 2016-16, “Intra-Entity Transfers of Assets Other Than Inventory” which requires recognition of the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. Therefore, ASU 2016-16 reverses the previous requirement to delay recognition of the tax consequences of these transactions until the associated assets are sold to an outside party. Adoption of ASU 2016-16 did not have a significant effect on FHN. Accounting Changes Issued but Not Currently Effective In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers.” ASU 2014-09 does not change revenue recognition for financial assets. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This is accomplished through a five-step recognition framework involving 1) the identification of contracts with customers, 2) identification of performance obligations, 3) determination of the transaction price, 4) allocation of the transaction price to the performance obligations and 5) recognition of revenue as performance obligations are satisfied. Additionally, qualitative and quantitative information is required for disclosure regarding the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. In February 2016, the FASB issued ASU 2016-08, “Principal versus Agent Considerations,” which provides additional guidance on whether an entity should recognize revenue on a gross or net basis, based on which party controls the specified good or service before that good or service is transferred to a customer. In April 2016, the FASB issued ASU 2016-10, “Identifying Performance Obligations and Licensing,” which clarifies the original guidance included in ASU 2014-09 for identification of the goods or services provided to customers and enhances the implementation guidance for licensing arrangements. ASU 2016-12, “Narrow-Scope Improvements and Practical Expedients,” was issued in May 2016 to provide additional guidance for the implementation and application of ASU 2014-09. “Technical Corrections and Improvements” ASU 2016-20 was issued in December 2016 and provides further guidance on certain issues. These ASUs are effective in annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. Early application is permitted for annual reporting periods beginning after December 15, 2016, and associated interim periods. Transition to the new requirements may be made by retroactively revising prior financial statements (with certain practical expedients permitted) or by a cumulative effect through retained earnings. If the latter option is selected, additional disclosures are required for comparability. FHN will not early adopt these ASUs and is evaluating their effects on its revenue recognition practices. Currently, FHN anticipates that it will elect to adopt the provisions of the revenue recognition standards through a cumulative effect to retained earnings with comparability disclosures provided throughout 2018. In February 2017, the FASB issued ASU 2017-05, “Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets” which clarifies the meaning and application of the term in substance nonfinancial asset in transactions involving both financial and nonfinancial assets. If substantially all of the fair value of the assets that are promised to the counterparty in a contract are concentrated in nonfinancial assets, then all of the financial assets promised to the counterparty are in substance nonfinancial assets within the scope of revenue recognition guidance for nonfinancial assets. ASU 2017-05 also clarifies that an entity should identify each distinct nonfinancial asset or in substance nonfinancial asset promised to a counterparty and derecognize each asset when a counterparty obtains control of it with the amount of revenue recognized based on the allocation guidance provided in ASU 2014-09. ASU 2017-05 also requires an entity to derecognize a distinct nonfinancial asset or distinct in substance nonfinancial asset in a partial sale transaction when it 1) does not have (or ceases to have) a controlling financial interest in the legal entity that holds the asset in accordance with Topic 810 and 2) transfers control of the asset in accordance with the provisions of ASU 2014-09. Once an entity transfers control of a distinct nonfinancial asset or distinct in substance nonfinancial asset, it is required to measure any noncontrolling interest it receives (or retains) at fair value. ASU 2017-05 has the same effective date and transition provisions as ASU 2014-09 and the two standards must be adopted simultaneously although the transition methods may be different. FHN is evaluating the effects of ASU 2017-05 on its revenue recognition practices. Currently, FHN anticipates that it will elect to adopt the provisions of ASU 2017-05 through a cumulative effect to retained earnings with comparability disclosures provided throughout 2018. In January 2016, the FASB issued ASU 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities.” ASU 2016-01 makes several revisions to the accounting, presentation and disclosure for financial instruments. Equity investments (except those accounted for under the equity method, those that result in consolidation of the investee, and those held by entities subject to specialized industry accounting which already apply fair value through earnings) are required to be measured at fair value with changes in fair value recognized in net income. This excludes FRB and FHLB stock holdings which are specifically exempted from the provisions of ASU 2016-01. An entity may elect to measure equity investments that do not have readily determinable market values at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or similar instruments from the same issuer. ASU 2016-01 also requires a qualitative impairment review for equity investments without readily determinable fair values, with measurement at fair value required if impairment is determined to exist. For liabilities for which fair value has been elected, ASU 2016-01 revises current accounting to record the portion of fair value changes resulting from instrument-specific credit risk within other comprehensive income rather than earnings. FHN has not elected fair value accounting for any existing financial liabilities. Additionally, ASU 2016-01 clarifies that the need for a valuation allowance on a deferred tax asset related to available-for-sale securities should be assessed in combination with all other deferred tax assets rather than being assessed in isolation. ASU 2016-01 also makes several changes to existing fair value presentation and disclosure requirements, including a provision that all disclosures must use an exit price concept in the determination of fair value. ASU 2016-01 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Transition will be through a cumulative effect adjustment to retained earnings for equity investments with readily determinable fair values. Equity investments without readily determinable fair values, for which the accounting election is made, will have any initial fair value marks recorded through earnings prospectively after adoption. Upon adoption, FHN will reclassify all equity investments out of available-for-sale securities, leaving only debt securities within this classification. FHN has evaluated the nature of its current equity investments and determined that substantially all qualify for the election available to assets without readily determinable fair values, including its holdings of Visa Class B shares. Accordingly, FHN intends to apply this election and any fair value marks for these investments will be recognized through earnings on a prospective basis subsequent to adoption. FHN continues to evaluate the appropriate characteristics of “similar” instruments as well as related valuation inputs and methodologies for its equity investments without readily determinable fair values. The requirements of ASU 2016-01 related to assessment of deferred tax assets and disclosure of the fair value of financial instruments will not have a significant effect on FHN because its current accounting and disclosure practices conform to the requirements of ASU 2016-01. FHN also continues to evaluate the impact of ASU 2016-01 on other aspects of its current accounting and disclosure practices. In February 2016, the FASB issued ASU 2016-02, “Leases,” which requires a lessee to recognize in its statement of condition a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. ASU 2016-02 leaves lessor accounting largely unchanged from prior standards. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. If a lessee makes this election, it should recognize lease expense for such leases generally on a straight-line basis over the lease term. All other leases must be classified as financing or operating leases which depends on the relationship of the lessee’s rights to the economic value of the leased asset. For finance leases, interest on the lease liability is recognized separately from amortization of the right-of-use asset in earnings, resulting in higher expense in the earlier portion of the lease term. For operating leases, a single lease cost is calculated so that the cost of the lease is allocated over the lease term on a generally straight-line basis. In transition to ASU 2016-02, lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The modified retrospective approach includes a number of optional practical expedients that entities may elect to apply, which would result in continuing to account for leases that commence before the effective date in accordance with previous requirements (unless the lease is modified) except that lessees are required to recognize a right-of-use asset and a lease liability for all operating leases at each reporting date based on the present value of the remaining minimum rental payments that were tracked and disclosed under previous requirements. ASU 2016-02 also requires expanded qualitative and quantitative disclosures to assess the amount, timing, and uncertainty of cash flows arising from lease arrangements. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. FHN is evaluating the impact of ASU 2016-02 on its current accounting and disclosure practices. In March 2016, the FASB issued ASU 2016-04, “Recognition of Breakage of Certain Prepaid Stored-Value Products,” which indicates that liabilities related to the sale of prepaid stored-value products are considered financial liabilities and should have a breakage estimate applied for estimated unused funds. ASU 2016-04 does not apply to stored-value products that can only be redeemed for cash, are subject to escheatment or are linked to a segregated bank account. ASU 2016-04 is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. FHN is evaluating the impact of ASU 2016-04 on its current accounting and disclosure practices. In June 2016, the FASB issued ASU 2016-13, “Measurement of Credit Losses on Financial Instruments,” which revises the measurement and recognition of credit losses for assets measured at amortized cost (e.g., held-to-maturity (“HTM”) loans and debt securities) and available-for-sale (“AFS”) debt securities. Under ASU 2016-13, for assets measured at amortized cost, the current expected credit loss (“CECL”) is measured as the difference between amortized cost and the net amount expected to be collected. This represents a departure from existing GAAP as the “incurred loss” methodology for recognizing credit losses delays recognition until it is probable a loss has been incurred. The measurement of current expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. Additionally, current disclosures of credit quality indicators in relation to the amortized cost of financing receivables will be further disaggregated by year of origination. ASU 2016-13 leaves the methodology for measuring credit losses on AFS debt securities largely unchanged, with the maximum credit loss representing the difference between amortized cost and fair value. However, such credit losses will be recognized through an allowance for credit losses, which permits recovery of previously recognized credit losses if circumstances change. ASU 2016-13 also revises the recognition of credit losses for purchased financial assets with a more-than insignificant amount of credit deterioration since origination (“PCD assets”). For PCD assets, the initial allowance for credit losses is added to the purchase price. Only subsequent changes in the allowance for credit losses are recorded as a credit loss expense for PCD assets. Interest income for PCD assets will be recognized based on the effective interest rate, excluding the discount embedded in the purchase price that is attributable to the acquirer’s assessment of credit losses at acquisition. Currently, credit losses for purchased credit-impaired assets are included in the initial basis of the assets with subsequent declines in credit resulting in expense while subsequent improvements in credit are reflected as an increase in the future yield from the assets. The provisions of ASU 2016-13 will be generally adopted through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in the year of adoption. Prospective implementation is required for debt securities for which an other-than-temporary-impairment (“OTTI”) had been previously recognized. Amounts previously recognized in accumulated other comprehensive income (“AOCI”) as of the date of adoption that relate to improvements in cash flows expected to be collected will continue to be accreted into income over the remaining life of the asset. Recoveries of amounts previously written off relating to improvements in cash flows after the date of adoption will be recorded in earnings when received. A prospective transition approach will be used for existing PCD assets where, upon adoption, the amortized cost basis will be adjusted to reflect the addition of the allowance for credit losses. Thus, an entity will not be required to reassess its purchased financial assets that exist as of the date of adoption to determine whether they would have met at acquisition the new criteria of more-than-insignificant credit deterioration since origination. An entity will accrete the remaining noncredit discount (based on the revised amortized cost basis) into interest income at the effective interest rate at the adoption date. ASU 2016-13 is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted in fiscal years beginning after December 15, 2018. FHN is still evaluating the impact of ASU 2016-13 on its current accounting and disclosure practices. In August 2016, the FASB issued ASU 2016-15, “Classification of Certain Cash Receipts and Cash Payments,” which clarifies multiple cash flow presentation issues including providing guidance as to classification on the cash flow statement for certain cash receipts and cash payments where diversity in practice exists. ASU 2016-15 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The provisions of ASU 2016-15 will be applied retroactively and will result in proceeds from bank-owned life insurance (“BOLI”) being classified as an investing activity rather than their prior classification as an operating activity. In March 2017, the FASB issued ASU 2017-07, “Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost” which requires the disaggregation of the service cost component from the other components of net benefit cost for pension and postretirement plans. Service cost must be included in the same income statement line item as other compensation-related expenses. All other components of net benefit cost are required to be presented in the income statement separately from the service cost component, with disclosure of the line items where these amounts are recorded. The presentation requirements of ASU 2017-07 must be applied retrospectively and adoption is required for annual periods beginning after December 15, 2017, including interim periods within those annual periods. FHN’s disclosures for pension and postretirement costs provide details of the service cost and all other components for expenses recognized for its applicable benefit plans. These amounts are currently included in Employee compensation, incentives, and benefits expense in the Consolidated Condensed Statements of Income. Upon adoption of ASU 2017-07 FHN will reclassify the expense components other than service cost into All other expense and revise its disclosures accordingly. The amounts to be reclassified are presented in Note 11 - Pension, Savings, and Other Employee Benefits in this Quarterly Report on Form 10-Q for the quarter ended March 31, 2017 and in Note 18 - Pension, Savings, and Other Employee Benefits in Exhibit 13 to FHN’s Annual Report on Form 10-K for the year ended December 31, 2016. In March 2017, the FASB issued ASU 2017-08, “Premium Amortization on Purchased Callable Debt Securities” which shortens the amortization period for securities that have explicit, noncontingent call features that are callable at fixed prices and on preset dates. In contrast to the current requirement for premium amortization to extend to the contractual maturity date, ASU 2017-08 requires the premium to be amortized to the earliest call date. ASU 2017-08 does not change the amortization of discounts, which will continue to be amortized to maturity. The new guidance does not apply to debt securities where the prepayment date is not preset or the price is not known in advance, which includes debt securities that qualify for amortization based on estimated prepayment rates. ASU 2017-08 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018 with early adoption permitted. Transition is accomplished through a cumulative-effect adjustment directly to retained earnings as of the beginning of the year of adoption. Based upon the current composition of its debt securities portfolios, FHN does not anticipate a significant effect upon adoption.

Accounting Changes Issued but Not Currently Effective

In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers.” ASU 2014-09 does not change revenue recognition for financial assets. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This is accomplished through a five-step recognition framework involving 1) the identification of contracts with customers, 2) identification of performance obligations, 3) determination of the transaction price, 4) allocation of the transaction price to the performance obligations and 5) recognition of revenue as performance obligations are satisfied. Additionally, qualitative and quantitative information is required for disclosure regarding the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. In February 2016, the FASB issued ASU 2016-08, “Principal versus Agent Considerations,” which provides additional guidance on whether an entity should recognize revenue on a gross or net basis, based on which party controls the specified good or service before that good or service is transferred to a customer. In April 2016, the FASB issued ASU 2016-10, “Identifying Performance Obligations and Licensing,” which clarifies the original guidance included in ASU 2014-09 for identification of the goods or services provided to customers and enhances the implementation guidance for licensing arrangements. ASU 2016-12, “Narrow-Scope Improvements and Practical Expedients,” was issued in May 2016 to provide additional guidance for the implementation and application of ASU 2014-09. “Technical Corrections and Improvements” ASU 2016-20 was issued in December 2016 and provides further guidance on certain issues. These ASUs are effective in annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. Early application is permitted for annual reporting periods beginning after December 15, 2016, and associated interim periods. Transition to the new requirements may be made by retroactively revising prior financial statements (with certain practical expedients permitted) or by a cumulative effect through retained earnings. If the latter option is selected, additional disclosures are required for comparability. FHN will not early adopt these ASUs and is evaluating their effects on its revenue recognition practices. Currently, FHN anticipates that it will elect to adopt the provisions of the revenue recognition standards through a cumulative effect to retained earnings with comparability disclosures provided throughout 2018.

In February 2017, the FASB issued ASU 2017-05, “Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets” which clarifies the meaning and application of the term in substance nonfinancial asset in transactions involving both financial and nonfinancial assets. If substantially all of the fair value of the assets that are promised to the counterparty in a contract are concentrated in nonfinancial assets, then all of the financial assets promised to the counterparty are in substance nonfinancial assets within the scope of revenue recognition guidance for nonfinancial assets. ASU 2017-05 also clarifies that an entity should identify each distinct nonfinancial asset or in substance nonfinancial asset promised to a counterparty and derecognize each asset when a counterparty obtains control of it with the amount of revenue recognized based on the allocation guidance provided in ASU 2014-09. ASU 2017-05 also requires an entity to derecognize a distinct nonfinancial asset or distinct in substance nonfinancial asset in a partial sale transaction when it 1) does not have (or ceases to have) a controlling financial interest in the legal entity that holds the asset in accordance with Topic 810 and 2) transfers control of the asset in accordance with the provisions of ASU 2014-09. Once an entity transfers control of a distinct nonfinancial asset or distinct in substance nonfinancial asset, it is required to measure any noncontrolling interest it receives (or retains) at fair value. ASU 2017-05 has the same effective date and transition provisions as ASU 2014-09 and the two standards must be adopted simultaneously although the transition methods may be different. FHN is evaluating the effects of ASU 2017-05 on its revenue recognition practices. Currently, FHN anticipates that it will elect to adopt the provisions of ASU 2017-05 through a cumulative effect to retained earnings with comparability disclosures provided throughout 2018.

In January 2016, the FASB issued ASU 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities.” ASU 2016-01 makes several revisions to the accounting, presentation and disclosure for financial instruments. Equity investments (except those accounted for under the equity method, those that result in consolidation of the investee, and those held by entities subject to specialized industry accounting which already apply fair value through earnings) are required to be measured at fair value with changes in fair value recognized in net income. This excludes FRB and FHLB stock holdings which are specifically exempted from the provisions of ASU 2016-01. An entity may elect to measure equity investments that do not have readily determinable market values at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or similar instruments from the same issuer. ASU 2016-01 also requires a qualitative impairment review for equity investments without readily determinable fair values, with measurement at fair value required if impairment is determined to exist. For liabilities for which fair value has been elected, ASU 2016-01 revises current accounting to record the portion of fair value changes resulting from instrument-specific credit risk within other comprehensive income rather than earnings. FHN has not elected fair value accounting for any existing financial liabilities. Additionally, ASU 2016-01 clarifies that the need for a valuation allowance on a deferred tax asset related to available-for-sale securities should be assessed in combination with all other deferred tax assets rather than being assessed in isolation. ASU 2016-01 also makes several changes to existing fair value presentation and disclosure requirements, including a provision that all disclosures must use an exit price concept in the determination of fair value. ASU 2016-01 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Transition will be through a cumulative effect adjustment to retained earnings for equity investments with readily determinable fair values. Equity investments without readily determinable fair values, for which the accounting election is made, will have any initial fair value marks recorded through earnings prospectively after adoption.

Upon adoption, FHN will reclassify all equity investments out of available-for-sale securities, leaving only debt securities within this classification. FHN has evaluated the nature of its current equity investments and determined that substantially all qualify for the election available to assets without readily determinable fair values, including its holdings of Visa Class B shares. Accordingly, FHN intends to apply this election and any fair value marks for these investments will be recognized through earnings on a prospective basis subsequent to adoption. FHN continues to evaluate the appropriate characteristics of “similar” instruments as well as related valuation inputs and methodologies for its equity investments without readily determinable fair values. The requirements of ASU 2016-01 related to assessment of deferred tax assets and disclosure of the fair value of financial instruments will not have a significant effect on FHN because its current accounting and disclosure practices conform to the requirements of ASU 2016-01. FHN also continues to evaluate the impact of ASU 2016-01 on other aspects of its current accounting and disclosure practices.

In February 2016, the FASB issued ASU 2016-02, “Leases,” which requires a lessee to recognize in its statement of condition a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. ASU 2016-02 leaves lessor accounting largely unchanged from prior standards. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. If a lessee makes this election, it should recognize lease expense for such leases generally on a straight-line basis over the lease term. All other leases must be classified as financing or operating leases which depends on the relationship of the lessee’s rights to the economic value of the leased asset. For finance leases, interest on the lease liability is recognized separately from amortization of the right-of-use asset in earnings, resulting in higher expense in the earlier portion of the lease term. For operating leases, a single lease cost is calculated so that the cost of the lease is allocated over the lease term on a generally straight-line basis.

In transition to ASU 2016-02, lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The modified retrospective approach includes a number of optional practical expedients that entities may elect to apply, which would result in continuing to account for leases that commence before the effective date in accordance with previous requirements (unless the lease is modified) except that lessees are required to recognize a right-of-use asset and a lease liability for all operating leases at each reporting date based on the present value of the remaining minimum rental payments that were tracked and disclosed under previous requirements. ASU 2016-02 also requires expanded qualitative and quantitative disclosures to assess the amount, timing, and uncertainty of cash flows arising from lease arrangements. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. FHN is evaluating the impact of ASU 2016-02 on its current accounting and disclosure practices.

In March 2016, the FASB issued ASU 2016-04, “Recognition of Breakage of Certain Prepaid Stored-Value Products,” which indicates that liabilities related to the sale of prepaid stored-value products are considered financial liabilities and should have a breakage estimate applied for estimated unused funds. ASU 2016-04 does not apply to stored-value products that can only be redeemed for cash, are subject to escheatment or are linked to a segregated bank account. ASU 2016-04 is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. FHN is evaluating the impact of ASU 2016-04 on its current accounting and disclosure practices.

In June 2016, the FASB issued ASU 2016-13, “Measurement of Credit Losses on Financial Instruments,” which revises the measurement and recognition of credit losses for assets measured at amortized cost (e.g., held-to-maturity (“HTM”) loans and debt securities) and available-for-sale (“AFS”) debt securities. Under ASU 2016-13, for assets measured at amortized cost, the current expected credit loss (“CECL”) is measured as the difference between amortized cost and the net amount expected to be collected. This represents a departure from existing GAAP as the “incurred loss” methodology for recognizing credit losses delays recognition until it is probable a loss has been incurred. The measurement of current expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. Additionally, current disclosures of credit quality indicators in relation to the amortized cost of financing receivables will be further disaggregated by year of origination. ASU 2016-13 leaves the methodology for measuring credit losses on AFS debt securities largely unchanged, with the maximum credit loss representing the difference between amortized cost and fair value. However, such credit losses will be recognized through an allowance for credit losses, which permits recovery of previously recognized credit losses if circumstances change.

ASU 2016-13 also revises the recognition of credit losses for purchased financial assets with a more-than insignificant amount of credit deterioration since origination (“PCD assets”). For PCD assets, the initial allowance for credit losses is added to the purchase price. Only subsequent changes in the allowance for credit losses are recorded as a credit loss expense for PCD assets. Interest income for PCD assets will be recognized based on the effective interest rate, excluding the discount embedded in the purchase price that is attributable to the acquirer’s assessment of credit losses at acquisition. Currently, credit losses for purchased credit-impaired assets are included in the initial basis of the assets with subsequent declines in credit resulting in expense while subsequent improvements in credit are reflected as an increase in the future yield from the assets.

The provisions of ASU 2016-13 will be generally adopted through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in the year of adoption. Prospective implementation is required for debt securities for which an other-than-temporary-impairment (“OTTI”) had been previously recognized. Amounts previously recognized in accumulated other comprehensive income (“AOCI”) as of the date of adoption that relate to improvements in cash flows expected to be collected will continue to be accreted into income over the remaining life of the asset. Recoveries of amounts previously written off relating to improvements in cash flows after the date of adoption will be recorded in earnings when received. A prospective transition approach will be used for existing PCD assets where, upon adoption, the amortized cost basis will be adjusted to reflect the addition of the allowance for credit losses. Thus, an entity will not be required to reassess its purchased financial assets that exist as of the date of adoption to determine whether they would have met at acquisition the new criteria of more-than-insignificant credit deterioration since origination. An entity will accrete the remaining noncredit discount (based on the revised amortized cost basis) into interest income at the effective interest rate at the adoption date.

ASU 2016-13 is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted in fiscal years beginning after December 15, 2018. FHN is still evaluating the impact of ASU 2016-13 on its current accounting and disclosure practices.

In August 2016, the FASB issued ASU 2016-15, “Classification of Certain Cash Receipts and Cash Payments,” which clarifies multiple cash flow presentation issues including providing guidance as to classification on the cash flow statement for certain cash receipts and cash payments where diversity in practice exists. ASU 2016-15 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The provisions of ASU 2016-15 will be applied retroactively and will result in proceeds from bank-owned life insurance (“BOLI”) being classified as an investing activity rather than their prior classification as an operating activity.

In March 2017, the FASB issued ASU 2017-07, “Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost” which requires the disaggregation of the service cost component from the other components of net benefit cost for pension and postretirement plans. Service cost must be included in the same income statement line item as other compensation-related expenses. All other components of net benefit cost are required to be presented in the income statement separately from the service cost component, with disclosure of the line items where these amounts are recorded. The presentation requirements of ASU 2017-07 must be applied retrospectively and adoption is required for annual periods beginning after December 15, 2017, including interim periods within those annual periods. FHN’s disclosures for pension and postretirement costs provide details of the service cost and all other components for expenses recognized for its applicable benefit plans. These amounts are currently included in Employee compensation, incentives, and benefits expense in the Consolidated Condensed Statements of Income. Upon adoption of ASU 2017-07 FHN will reclassify the expense components other than service cost into All other expense and revise its disclosures accordingly. The amounts to be reclassified are presented in Note 11 - Pension, Savings, and Other Employee Benefits in this Quarterly Report on Form 10-Q for the quarter ended March 31, 2017 and in Note 18 - Pension, Savings, and Other Employee Benefits in Exhibit 13 to FHN’s Annual Report on Form 10-K for the year ended December 31, 2016.

In March 2017, the FASB issued ASU 2017-08, “Premium Amortization on Purchased Callable Debt Securities” which shortens the amortization period for securities that have explicit, noncontingent call features that are callable at fixed prices and on preset dates. In contrast to the current requirement for premium amortization to extend to the contractual maturity date, ASU 2017-08 requires the premium to be amortized to the earliest call date. ASU 2017-08 does not change the amortization of discounts, which will continue to be amortized to maturity. The new guidance does not apply to debt securities where the prepayment date is not preset or the price is not known in advance, which includes debt securities that qualify for amortization based on estimated prepayment rates. ASU 2017-08 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018 with early adoption permitted. Transition is accomplished through a cumulative-effect adjustment directly to retained earnings as of the beginning of the year of adoption. Based upon the current composition of its debt securities portfolios, FHN does not anticipate a significant effect upon adoption.