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Summary of Significant Accounting Policies | 12 Months Ended
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Dec. 31, 2019
Accounting Policies [Abstract] |
Summary of Significant Accounting Policies | Note 1. Summary of Significant Accounting Policies Nature of Business — Pinnacle Financial Partners, Inc. (Pinnacle Financial) is a financial holding company whose primary business is conducted by its wholly-owned subsidiary, Pinnacle Bank (Pinnacle Bank). Pinnacle Bank is a commercial bank headquartered in Nashville, Tennessee. Pinnacle Financial completed its acquisitions of CapitalMark Bank & Trust (CapitalMark), Magna Bank (Magna), Avenue Financial Holdings, Inc. (Avenue) and BNC Bancorp (BNC) on July 31, 2015, September 1, 2015, July 1, 2016 and June 16, 2017, respectively. Pinnacle Financial and Pinnacle Bank also collectively hold a 49% interest in Bankers Healthcare Group, LLC (BHG), a company that primarily serves as a full-service commercial loan provider to healthcare and other professional practices. Pinnacle Bank provides a full range of banking services, including investment, mortgage, and insurance services, and comprehensive wealth management services, in its 12 primarily urban markets within Tennessee, the Carolinas, Virginia and beginning in December 2019, Georgia. On July 2, 2019, Pinnacle Bank acquired all of the outstanding stock of Advocate Capital, Inc. (Advocate Capital) for a cash price of $59.0 million. Advocate Capital's $134.3 million of indebtedness on the acquisition date was also paid off in connection with consummation of the acquisition. Advocate Capital is a finance firm headquartered in Nashville, TN which supports the financial needs of legal firms through both case expense financing and working capital lines of credit. Pinnacle Financial accounted for the acquisition of Advocate Capital under the acquisition method in accordance with ASC Topic 805. Accordingly, the purchase price is allocated to the fair value of the assets acquired and liabilities acquired as of the date of acquisition. Determining the fair value of assets and liabilities, particularly illiquid assets and liabilities, is a complicated process involving significant judgment regarding estimates and assumptions used to calculate estimated fair value. Fair value adjustments based on updated estimates could materially affect the goodwill recorded on the Advocate Capital acquisition. At the acquisition date, Advocate Capital's net assets, including identifiable intangible assets, were initially recorded at a fair value of approximately $45.6 million, consisting mainly of loans receivable. The purchase price allocations for the acquisition of Advocate Capital are preliminary and will be finalized upon the receipt of final valuations on certain assets and liabilities. Basis of Presentation — These consolidated financial statements include the accounts of Pinnacle Financial and its direct and indirect wholly-owned subsidiaries. Certain statutory trust affiliates of Pinnacle Financial, as noted in Note 9. Other Borrowings are included in these consolidated financial statements pursuant to the equity method of accounting. Significant intercompany transactions and accounts are eliminated in consolidation. Use of Estimates — The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities as of the balance sheet dates and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term include the determination of the allowance for loan losses, determination of any impairment of goodwill or intangible assets. Impairment — Long-lived assets, including purchased intangible assets subject to amortization, such as core deposit intangible assets, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized by the amount by which the carrying amount of the asset exceeds the fair value of the asset. Assets to be disposed of would be separately presented in the balance sheet and reported at the lower of the carrying amount or fair value less costs to sell, and are no longer depreciated. Pinnacle Financial had $51.1 million and $46.2 million of long-lived intangibles at December 31, 2019 and 2018, respectively. Goodwill is evaluated for impairment at least annually and more frequently if events and circumstances indicate that the asset might be impaired. The Accounting Standards Codification (ASC) 350, Goodwill and Other, regarding testing goodwill for impairment provides an entity the option to first perform a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If an entity does a qualitative assessment and determines that this is the case, or if a qualitative assessment is not performed, it is required to perform additional goodwill impairment testing to identify potential goodwill impairment and measure the amount of goodwill impairment loss to be recognized for that reporting unit (if any). Based on a qualitative assessment, if an entity determines that the fair value of a reporting unit is more than its carrying amount, the two-step goodwill impairment test is not required. Pinnacle Financial performed its annual assessment as of September 30, 2019. The results of the qualitative assessment indicated that the fair value of Pinnacle Financial's sole reporting unit was more than its carrying value, and accordingly, the two-step goodwill impairment test was not performed. Should Pinnacle Financial's common stock price decline below book value per share and remain below book value per share for an extended duration or other impairment indicators become known, additional impairment testing of goodwill may be required. Should it be determined in a future period that the goodwill has become impaired, then a charge to earnings will be recorded in the period such determination is made. The following table presents activity for goodwill and other intangible assets (in thousands):
| Goodwill |  | Core deposit and other intangible assets |  | Total
Balance at December 31, 2018 | $ | 1,807,121 |  |  | $ | 46,161 |  |  | $ | 1,853,282 |
Acquisitions | 12,690 |  |  | 14,877 |  |  | 27,567 |
Amortization | — |  |  | (9,908) |  |  | (9,908) |
Balance at December 31, 2019 | $ | 1,819,811 |  |  | $ | 51,130 |  |  | $ | 1,870,941 |
The following table presents the gross carrying amount and accumulated amortization for the core deposit and other intangible assets, which are subject to amortization (in thousands):
| December 31, 2019 |  | December 31, 2018
Gross carrying amount | $ | 107,665 |  |  | $ | 92,787 |
Accumulated amortization | (56,535) |  |  | (46,626) |
Net book value | $ | 51,130 |  |  | $ | 46,161 |
Cash Equivalents and Cash Flows — Cash on hand, cash items in process of collection, amounts due from banks, Federal funds sold, short-term discount notes and securities purchased under agreements to resell, with original maturities within ninety days, are included in cash and cash equivalents. The following supplemental cash flow information addresses certain cash payments and noncash transactions for each of the years in the three-year period ended December 31, 2019 as follows (in thousands):
| For the years ended December 31, |  |  |  |
| 2019 |  | 2018 |  | 2017
Cash Payments: |  |  |  |  |
Interest | $ | 287,272 |  |  | $ | 199,464 |  |  | $ | 91,628 |
Income taxes paid | 86,960 |  |  | 55,626 |  |  | 81,539 |
Noncash Transactions: |  |  |  |  |
Loans charged-off to the allowance for loan losses | 28,467 |  |  | 30,400 |  |  | 22,046 |
Loans foreclosed upon with repossessions transferred to other real estate | 17,937 |  |  | 3,524 |  |  | 6,228 |
Loans foreclosed upon with repossessions transferred to other repossessed assets | 93 |  |  | 1,899 |  |  | 646 |
Other real estate sales financed | 871 |  |  | 891 |  |  | 908 |
Fixed assets transferred to other real estate | 8,182 |  |  | — |  |  | — |
Available-for-sale securities transferred to held-to-maturity portfolio | — |  |  | 179,763 |  |  | — |
Held-for-sale loans transferred to held-for-investment loan portfolio | — |  |  | 44,980 |  |  | — |
Common stock issued in connection with acquisitions | — |  |  | — |  |  | 1,850,968 |
Right-of-use assets recognized in the period in exchange for lease obligations(1) | 90,927 |  |  | — |  |  | — |
(1) Includes $79.9 million recognized upon initial adoption of ASU 2016-02 on January 1, 2019. Securities — Securities are classified based on management's intention on the date of purchase. All debt securities classified as available-for-sale are recorded at fair value with any unrealized gains and losses reported in accumulated other comprehensive income (loss), net of the deferred income tax effects. Securities that Pinnacle Financial has both the positive intent and ability to hold to maturity are classified as held-to-maturity and are carried at historical cost and adjusted for amortization of premiums and accretion of discounts. Interest and dividends on securities, including amortization of premiums and accretion of discounts calculated under the effective interest method, are included in interest income. For certain securities, amortization of premiums and accretion of discounts is computed based on the anticipated life of the security which may be shorter than the stated life of the security. Realized gains and losses from the sale of securities are determined using the specific identification method and are recorded on the trade date of the sale. Other-than-temporary Impairment — A decline in the fair value of any available-for-sale or held-to-maturity security below cost that is deemed to be other-than-temporary results in a reduction in the carrying amount of the security. To determine whether impairment is other-than-temporary, management considers whether the entity expects to recover the entire amortized cost basis of the security by reviewing the present value of the future cash flows associated with the security. The shortfall of the present value of the cash flows expected to be collected in relation to the amortized cost basis is referred to as a credit loss and is deemed to be other-than-temporary impairment. If a credit loss is identified, the credit loss is recognized as a charge to earnings and a new cost basis for the security is established. If management concludes that a decline in fair value of a security is temporary and a full recovery of principal and interest is expected and it is not more-likely-than-not that it will be required to sell the security before recovery of its amortized cost basis, then the security is not other-than-temporarily impaired and the shortfall is recorded as a component of equity. Periodically, available-for-sale securities may be sold or the composition of the portfolio realigned to improve yields, quality or marketability, or to implement changes in investment or asset/liability strategy, including maintaining collateral requirements and raising funds for liquidity purposes. Additionally, if an available-for-sale security loses its investment grade, tax-exempt status, the underlying credit support is terminated or collection otherwise becomes uncertain based on factors known to management, Pinnacle will consider selling the security, but will review each security on a case-by-case basis as these factors become known. Resultantly, other-than-temporary charges may be incurred as management's intention related to a particular security changes. The carrying values of Pinnacle Financial's investment securities could decline in the future if the financial condition of the securities' issuer deteriorates and management determines it is probable that Pinnacle Financial will not recover the entire amortized cost bases of the securities. As a result, there is a risk that other-than-temporary impairment charges may occur in the future. There is also a risk that other-than-temporary impairment charges may occur in the future if management's intention to hold these securities to maturity and/or recovery changes. Loans held-for-sale — Loans originated and intended for sale are carried at the lower of cost or estimated fair value as determined on a loan-by-loan basis. Net unrealized losses, if any, are recognized through a valuation allowance by charges to income. Realized gains and losses are recognized when legal title to the loans has been transferred to the purchaser and sales proceeds have been received and are reflected in the accompanying consolidated statement of income in gains on mortgage loans sold, net of related costs such as compensation expenses, for mortgage loans, and as a component of other noninterest income for commercial loans held-for-sale. Loans — Pinnacle Financial has five loan segments for financial reporting purposes: commercial and industrial, commercial real estate mortgage, construction and land development, consumer and other and consumer real estate mortgage. The appropriate classification is determined based on the underlying collateral utilized to secure each loan. These classifications are consistent with those utilized in the Quarterly Report of Condition and Income filed by Pinnacle Bank with the Federal Deposit Insurance Corporation (FDIC). Loans are reported at their outstanding principal balances, net of applicable purchase accounting and any deferred fees or costs on originated loans. Interest income on loans is accrued based on the principal balance outstanding. Loan origination fees, net of certain loan origination costs, are deferred and recognized as an adjustment to the related loan yield using a method which approximates the interest method. At December 31, 2019 and 2018, net deferred loan fees of $13.7 million and $7.4 million respectively, were included as a reduction to loans on the accompanying consolidated balance sheets. As part of our routine credit monitoring process, commercial loans receive risk ratings by the assigned financial advisor and are subject to validation by our independent loan review department. Risk ratings are categorized as pass, special mention, substandard, substandard-nonaccrual or doubtful-nonaccrual. Pinnacle Financial believes that its categories follow those outlined by the FDIC, Pinnacle Bank's primary federal regulator. At December 31, 2019, approximately 80.3% of Pinnacle Financial's loan portfolio was assigned a specifically assigned risk rating. Certain consumer loans and commercial relationships that possess certain qualifying characteristics, including individually smaller balances, are generally not assigned an individual risk rating but are evaluated collectively for credit risk as a homogeneous pool of loans and individually as either accrual or nonaccrual based on the performance of the loan. Loans are placed on nonaccrual status when there is a significant deterioration in the financial condition of the borrower, which generally is the case but is not limited to when the principal or interest is more than 90 days past due, unless the loan is both well-secured and in the process of collection. All interest accrued but not collected for loans that are placed on nonaccrual status is reversed against current interest income. Interest income is subsequently recognized only if certain cash payments are received while the loan is classified as nonaccrual, but interest income recognition is reviewed on a case-by-case basis to determine if the payment should be applied to interest or principal pursuant to regulatory guidelines. A nonaccrual loan is returned to accruing status once the loan has been brought current as to principal and interest and collection is reasonably assured or the loan has been well-secured through other techniques. All loans that are placed on nonaccrual status are further analyzed to determine if they should be classified as impaired loans. A loan is considered to be impaired when it is probable Pinnacle Financial will be unable to collect all principal and interest payments due in accordance with the contractual terms of the loan. This determination is made using a variety of techniques, which include a review of the borrower's financial condition, debt-service coverage ratios, global cash flow analysis, guarantor support, other loan file information, meetings with borrowers, inspection or reappraisal of collateral and/or consultation with legal counsel as well as results of reviews of other similar industry credits (e.g. builder loans, development loans, church loans, etc.). Loans are charged off when management believes that the full collectability of the loan is unlikely. As such, a loan may be partially charged-off after a "confirming event" has occurred which serves to validate that full repayment pursuant to the terms of the loan is unlikely. Purchased Loans — Purchased loans, including loans acquired through a merger, are initially recorded at fair value on the date of purchase. Purchased loans that contain evidence of post-origination credit deterioration as of the purchase date are carried at the net present value of expected future cash flows. All other purchased loans are recorded at their initial fair value, and adjusted for subsequent advances, pay downs, amortization or accretion of any fair value premium or discount on purchase, charge-offs and any other adjustment to carrying value. Pursuant to U.S. generally accepted accounting principles (U. S. GAAP), management has up to 12 months following the date of the acquisition to finalize the fair values of acquired assets and assumed liabilities as of the acquisition date. Once management has finalized the fair values of acquired assets and assumed liabilities within this 12-month period, management considers such values to be the day 1 fair values (Day 1 Fair Values). At the time of acquisition, management evaluates all purchased loans using a variety of factors such as current classification or risk rating, past due status and history as a component of the fair value determination. For those purchased loans without evidence of credit deterioration, management evaluates each reviewed loan using an internal grading system with a grade assigned to each loan at the date of acquisition. To the extent that any purchased loan is not specifically reviewed, such loan is assumed to have characteristics similar to the characteristics of the specifically reviewed acquired portfolio of purchased loans. The grade for each purchased loan without evidence of credit deterioration is reviewed subsequent to the date of acquisition any time a loan is renewed or extended or at any time information becomes available to Pinnacle Financial that provides material insight regarding the loan's performance, the borrower's capacity to repay or the underlying collateral. In determining the Day 1 Fair Values of purchased loans without evidence of post-origination credit deterioration at the date of acquisition, management includes (i) no carryover of any previously recorded allowance for loan losses (allowance) and (ii) an adjustment of the unpaid principal balance to reflect an appropriate market rate of interest and expected loss, given the risk profile and risk rating assigned to each loan. This adjustment is accreted into earnings as a yield adjustment, using the effective yield method, over the remaining life of each loan. Purchased loans that contain evidence of credit deterioration on the date of purchase are individually evaluated by management to determine the estimated fair value of each loan. This evaluation includes no carryover of any previously recorded allowance. In determining the estimated fair value of purchased loans with evidence of credit deterioration, management considers a number of factors including, among other things, the remaining life of the acquired loans, estimated prepayments, estimated loss ratios, estimated value of the underlying collateral, estimated holding periods, and net present value of cash flows expected to be received. In determining the Day 1 Fair Values of purchased loans with evidence of credit deterioration, management calculates a non-accretable difference (the credit risk component of the purchased loans) and an accretable difference (the yield component of the purchased loans). The non-accretable difference is the difference between the contractually required payments and the cash flows expected to be collected in accordance with management's determination of the Day 1 Fair Values. Subsequent increases in expected cash flows will result in an adjustment to accretable yield, which will have a positive impact on interest income. Subsequent decreases in expected cash flows will generally result in increased provision for loan losses. Subsequent increases in expected cash flows following any previous decrease will result in a reversal of the provision for loan losses to the extent of prior charges and then an adjustment to accretable yield. The accretable difference on purchased loans with evidence of credit deterioration is the difference between the expected cash flows and the net present value of expected cash flows. Such difference is accreted into earnings using the effective yield method over the term of the loans. For purchased loans with evidence of credit deterioration for which the expected cash flows cannot be forecasted, these loans are deemed to be collateral dependent, are recorded at their fair value and are placed on nonaccrual, with interest payments recorded on a cash basis, as appropriate. Allowance for Loan Losses (allowance) - Pinnacle Financial's management assesses the adequacy of the allowance prior to the end of each calendar quarter. This assessment includes procedures to estimate the allowance and test the adequacy and appropriateness of the resulting balance. The level of the allowance is based upon management's evaluation of the loan portfolio, loan loss experience, asset quality trends, known and inherent risks in the portfolio, adverse situations that may affect the borrowers' ability to repay the loan (including the timing of future payment), the estimated value of any underlying collateral, composition of the loan portfolio, economic conditions, industry and peer bank loan quality indications and other pertinent factors, including regulatory recommendations. The level of allowance maintained by management is believed adequate to absorb probable losses inherent in the loan portfolio at the balance sheet date. The allowance is increased by provisions charged to expense and decreased by charge-offs, net of recoveries of amounts previously charged-off. Allocation of the allowance may be made for specific loans, but the entire allowance is available for any loan that, in management's judgment, is deemed uncollectible. Pinnacle Financial's allowance for loan loss assessment methodology was modified during the year ended December 31, 2017 to (i) extend the look-back period from 24 quarters to a period beginning January 1, 2006 to better capture the risk associated with this extended economic cycle, (ii) eliminate the use of risk ratings in the calculation of the loss rate and instead focus on loss rate by loan type and (iii) expand the economic variables used in the qualitative assessment to incorporate our expanded footprint. Pinnacle Financial also eliminated the use of a loss emergence period in light of the minimal population of losses available to evaluate that were previously being extrapolated to the full population of loans, and shifted the focus of its analysis to more of a quantitative model. There was no material impact on the adoption of the changes in the allowance for loan loss assessment methodology. Pinnacle Financial's allowance for loan losses is composed of the result of two independent analyses pursuant to the provisions of ASC 450-20, Loss Contingencies and ASC 310-10-35, Receivables. The ASC 450-20 analysis is intended to quantify the inherent risks in its performing loan portfolio. The ASC 310-10-35 analysis includes a loan-by-loan analysis of impaired loans, including those reported as nonaccrual, troubled-debt restructurings and purchase credit impaired. In assessing the adequacy of the allowance, Pinnacle Financial also considers the results of Pinnacle Financial's ongoing independent loan review process. Pinnacle Financial undertakes this process both to ascertain those loans in the portfolio with elevated credit risk and to assist in its overall evaluation of the risk characteristics of the entire loan portfolio. Its loan review process includes the judgment of management, independent internal loan reviewers, and reviews that may have been conducted by third-party reviewers including regulatory examiners. Pinnacle Financial incorporates relevant loan review results in the allowance. The ASC 450-20 component of the allowance for loan losses begins with a historical loss rate calculation for each loan pool with similar risk characteristics. The losses realized over a rolling four-quarter cycle are utilized to determine an annual loss rate for each loan pool for each quarter-end in our look-back period. The look-back period in our loss rate calculation begins with January 1, 2006, as we believe the period from January 1, 2006 to present is more representative of this economic cycle. The loss rates for each category are then averaged and applied to the end of period loan portfolio balances to determine estimated losses. The loss rates provide a quantitative estimate of credit losses inherent in our end of period loan portfolio based on our actual loss experience. The estimated loan loss allocation for all loan segments is then adjusted for management's estimate of probable losses for a number of qualitative factors that have not been considered in the quantitative analysis. The qualitative categories and the measurements used to quantify the risks within each of these categories are subjectively selected by management, but measured by objective measurements period over period. The data for each measurement may be obtained from internal or external sources. The current period measurements are evaluated and assigned a factor commensurate with the current level of risk relative to past measurements over time. The resulting factor is applied to the non-impaired loan portfolio. This amount represents estimated probable inherent credit losses which exist, but have not yet been identified either in its risk rating or impairment process, as of the balance sheet date, and is based upon quarterly trend assessments in portfolio concentrations, policy exceptions, economic conditions, associate retention, independent loan review results, collateral considerations, credit quality, competition, enterprise wide risk assessments, and peer group credit quality. The qualitative allowance allocation, as determined by the processes noted above, is increased or decreased for each loan segment based on the assessment of these various qualitative factors. The allowance for loan losses for purchased loans is calculated similar to that utilized for legacy Pinnacle Bank loans. Pinnacle Financial's accounting policy is to compare the computed allowance for loan losses for each purchased loan to the remaining fair value adjustment at the individual loan level. If the computed allowance at the loan level is greater than the remaining fair value adjustment, the excess is added to the allowance for loan losses by a charge to the provision for loan losses. The ASC 450-20 portion of the allowance includes a small unallocated component. Pinnacle Financial believes that the unallocated amount is warranted for inherent factors that cannot be practically assigned to individual loan categories, such as the imprecision in the overall loss allocation measurement process, the subjectivity risk of potentially not considering all relevant environmental categories and related measurements and imprecision in its credit risk ratings process. The appropriateness of the unallocated component of the allowance is assessed each quarter end based upon changes in the overall business environment not otherwise captured. The impaired loan allowance is determined pursuant to ASC 310-10-35. Loans are impaired when, based on current information and events, it is probable that we will be unable to collect all amounts due according to the contractual terms of the loan agreement. Collection of all amounts due according to the contractual terms means collecting all interest and principal payments of a loan as scheduled in the loan agreement. This evaluation is inherently subjective as it requires material estimates including the amounts and timing of future cash flows expected to be received on impaired loans that may be susceptible to significant change. Loan losses are charged off when management believes that the full collectability of the loan is unlikely. A loan may be partially charged-off after a "confirming event" has occurred which serves to validate that full repayment pursuant to the terms of the loan is unlikely. An impairment allowance is recognized if the fair value of the loan is less than the recorded investment in the loan (recorded investment in the loan is the principal balance plus any accrued interest, net of deferred loan fees or costs and unamortized premium or discount). The impairment is recognized through the provision for loan losses and is a component of the allowance for loan losses. Loans that are impaired are recorded at the present value of expected future cash flows discounted at the loan's effective interest rate, or if the loan is collateral dependent, at the fair value of the collateral, less estimated disposal costs. If the loan is cash flow dependent, a specific reserve is established as a component of the allowance. If the loan is collateral dependent, any portion of the loan confirmed to be uncollectible is charged off, and a specific reserve is established for any remaining impairment. The fair value of collateral dependent loans is derived primarily from collateral appraisals performed by independent third-party appraisers. This analysis is completed for all individual loans greater than $1.0 million. The resulting allowance percentage by segment adjusted for specific trends identified, if applicable, is then applied to the remaining population of impaired loans. Pursuant to the guidance set forth in ASU No. 2011-02, A Creditor's Determination of Whether a Restructuring is a Troubled Debt Restructuring, the above impairment methodology is also applied to those loans identified as troubled debt restructurings. Sufficiency of the total computed allowance is then tested by comparison to historical trends and industry and peer information. Pinnacle Financial then evaluates the result of the procedures performed, including the results of its testing, and concludes on the appropriateness of the balance of the allowance in its entirety. The audit committee of Pinnacle Financial's board of directors reviews and approves the methodology and resultant allowance prior to the filing of quarterly and annual financial information. While its policies and procedures used to estimate the allowance for loan losses, as well as the resultant provision for loan losses charged to income, are considered adequate by management and are reviewed from time to time by regulators, they are necessarily approximate and imprecise. There are factors beyond Pinnacle Financial's control, such as conditions in the local, national, and international economy, a local real estate market or particular industry conditions which may materially negatively impact asset quality and the adequacy of the allowance for loan losses and thus the resulting provision for loan losses. As discussed more fully in the Recently Issued Not Yet Effective Accounting Standards, Pinnacle Financial adopted Accounting Standards Update 2016-13, Financial Instruments--Credit Losses: Measurement of Credit Losses on Financial Instruments (CECL) effective January 1, 2020. Transfers of Financial Assets — Transfers of financial assets are accounted for as sales when control over the assets has been surrendered or in the case of a loan participation, a portion of the asset has been surrendered and meets the definition of a "participating interest". Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from Pinnacle Financial, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) Pinnacle Financial does not maintain effective control over the transferred assets through an agreement to repurchase them before maturity. Premises and Equipment and Leaseholds — Premises and equipment are carried at cost less accumulated depreciation and amortization computed principally by the straight-line method over the estimated useful lives of the assets or the expected lease terms for leasehold improvements, whichever is shorter. Useful lives for all premises and equipment range between three and thirty years. Pinnacle Financial , or a subsidiary of Pinnacle Financial, is the lessee with respect to multiple office locations. At December 31, 2019, all such leases were being accounted for as operating leases within the accompanying consolidated financial statements, with the exception of one lease agreement classified as a finance lease. Beginning January 1, 2019, Pinnacle Financial recognized right-of-use assets and lease liabilities reflecting the present value of future minimum lease payments under its lease agreements in accordance with A ccounting Standards Update 2016-02, Leases, noted below under "Recently Adopted Accounting Pronouncements." Other Real Estate Owned — Other real estate owned (OREO) represents real estate foreclosed upon or acquired by deed in lieu of foreclosure by Pinnacle Bank through loan defaults by customers as well as properties acquired in connection with the acquisition of BNC that had previously been held for future expansion but were transferred to OREO in 2019. Substantially all of these amounts relate to lots, homes and residential development projects that are either completed or are in various stages of construction for which Pinnacle Financial believes it has adequately supported the value recorded. Upon its acquisition by Pinnacle Bank, the property is recorded at fair value, based on appraised value, less selling costs estimated as of the date acquired. The difference from the loan balance related to the property, if any, is recognized as a charge-off through the allowance for loan losses. Additional OREO losses for subsequent downward valuation adjustments and expenses to maintain OREO are determined on a specific property basis and are included as a component of noninterest expense. Net gains or losses realized at the time of disposal are reflected in noninterest expense. Included in the accompanying consolidated balance sheet at December 31, 2019 is $30.3 million of OREO with related property-specific valuation allowances of $772,000. At December 31, 2018, OREO totaled $16.2 million with related property-specific valuation allowances of $1.0 million. During the years ended December 31, 2019, 2018 and 2017, Pinnacle Financial had $4.2 million, $723,000 and $1.1 million, respectively, of net foreclosed real estate expense. Other Assets — Included in other assets as of December 31, 2019 and 2018, is approximately $6.0 million and $7.7 million, respectively, of computer software related assets, net of amortization. This software supports Pinnacle Financial's primary data systems and relates to amounts paid to vendors for installation and development of such systems. These amounts are amortized on a straight-line basis over periods of three to seven years. For the years ended December 31, 2019, 2018, and 2017, Pinnacle Financial's amortization expense was approximately $2.7 million, $3.0 million, and $2.5 million, respectively. Software maintenance fees are capitalized in other assets and amortized over the term of the maintenance agreement. Pinnacle Financial is required to maintain certain minimum levels of equity investments with certain regulatory and other entities in which Pinnacle Bank has outstanding borrowings, including the Federal Home Loan Bank of Cincinnati. At December 31, 2019 and 2018, the cost of these investments was $80.4 million and $70.2 million, respectively. Pinnacle Financial determined that cost approximates the fair value of these investments. Additionally, Pinnacle Financial has recorded certain investments in other non-public entities and funds at fair value, of $38.2 million and $26.4 million at December 31, 2019 and 2018, respectively. During 2019 and 2018, Pinnacle Financial recorded net gains of $2.8 million and $2.7 million, respectively, due to changes in the fair value of these investments. As more fully described in Note 9, Pinnacle Financial has an investment in twelve Trusts valued at $4.0 million as of December 31, 2019. The Trusts were established to issue preferred securities, the dividends for which are paid with interest payments Pinnacle Financial makes on subordinated debentures it issued to the Trusts. Pinnacle Bank is the owner and beneficiary of various life insurance policies on certain key executives and certain current and former directors and associates, including policies that were acquired in its mergers. Collectively, these policies are reflected in other assets in the accompanying consolidated balance sheets at their respective cash surrender values. At December 31, 2019 and 2018, the aggregate cash surrender value of these policies was approximately $652.7 million and $525.7 million, respectively. Noninterest income related to these policies was $17.4 million, $12.5 million, and $7.9 million, during the years ended December 31, 2019, 2018 and 2017, respectively. Also, as part of our compliance with the Community Reinvestment Act, we have investments in low income housing entities totaling $100.9 million and $72.6 million, net, as of December 31, 2019 and 2018, respectively. Included in our CRA investments are investments of $58.4 million and $32.8 million at December 31, 2019 and 2018, respectively, net of amortization, that qualify for federal low income housing tax credits. The investments are accounted for under the proportional amortization method. Under the proportional amortization method, the initial cost of the investment is amortized in proportion to the tax credits and other tax benefits received. The amortization and benefits are recognized as a component of income tax expense in the consolidated statements of income. The investments are recorded using the cost method. Derivative Instruments — In accordance with ASC Topic 815, Derivatives and Hedging, all derivative instruments are recorded on the accompanying consolidated balance sheet at their respective fair values. The accounting for changes in fair value (i.e., gains or losses) of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship. If the derivative instrument is not designated as a hedge, changes in the fair value of the derivative instrument are recognized in earnings in the period of change. Pinnacle Financial enters into interest rate swaps (swaps) to facilitate customer transactions and meet their financing needs. Upon entering into these instruments to meet customer needs, Pinnacle Financial enters into offsetting positions with large U.S. financial institutions in order to minimize the risk to Pinnacle Financial. These swaps are derivatives, but are not designated as hedging instruments. Pinnacle Financial enters into forward cash flow hedge relationships in the form of interest rate swap agreements to manage its future interest rate exposure. These derivative contracts have been designated as a hedge and, as such, changes in the fair value of the derivative instrument are recorded in other comprehensive income. Pinnacle Financial also enters into fair value hedge relationships to mitigate the effect of changing interest rates on the fair values of fixed rate securities and loans. The gain or loss on the derivative instrument as well as the offsetting loss or gain on the hedged asset or liability attributable to the hedged risk are recognized in current earnings. The gain or loss on the derivative instrument is presented on the same income statement line item as the earnings effect of the hedged item. Pinnacle Financial prepares written hedge documentation for all derivatives which are designated as hedges. The written hedge documentation includes identification of, among other items, the risk management objective, hedging instrument, hedged item and methodologies for assessing and measuring hedge effectiveness and ineffectiveness, along with support for management's assertion that the hedge will be highly effective. For designated hedging relationships, Pinnacle Financial performs retrospective and prospective effectiveness testing using quantitative methods where required by accounting standards. For certain hedging relationships, effectiveness is tested through the matching of critical terms. Assessments of hedge effectiveness and measurements of hedge ineffectiveness are performed at least quarterly. The portion of the changes in the fair value of a derivative that is highly effective and that has been designated and qualifies as a cash flow hedge is initially recorded in accumulated other comprehensive income (AOCI) and will be reclassified to earnings in the same period that the hedged item impacts earnings; any ineffective portion is recorded in current period earnings. Hedge accounting ceases on transactions that are no longer deemed effective, or for which the derivative has been terminated or de-designated. Securities Sold Under Agreements to Repurchase — Pinnacle Financial routinely sells securities to certain treasury management customers and then repurchases these securities the next day. Securities sold under agreements to repurchase are reflected as a secured borrowing in the accompanying consolidated balance sheets at the amount of cash received in connection with each transaction. Income Taxes — ASC 740, Income Taxes, defines the threshold for recognizing the benefits of tax return positions in the financial statements as "more-likely-than-not" to be sustained by the taxing authority. ASC 740 also provides guidance on the derecognition, measurement and classification of income tax uncertainties, along with any related interest and penalties, and includes guidance concerning accounting for income tax uncertainties in interim periods. Deferred tax assets and liabilities are the expected future tax amounts for the temporary differences between carrying amounts and tax bases of assets and liabilities, computed using enacted tax rates. Accordingly, deferred tax assets that will be realized after December 31, 2017 were revalued using the tax rates enacted as a result of the 2017 Tax Cuts and Jobs Act resulting in a revaluation charge of $31.5 million. The net deferred tax asset is reflected as a component of other assets on the consolidated balance sheet. A valuation allowance is required for deferred tax assets if, based on available evidence, it is more likely than not that all or some portion of the asset may not be realized due to the inability to generate sufficient taxable income in the period and/or of the character necessary to utilize the benefit of the deferred tax asset. Income tax expense or benefit for the year is allocated among continuing operations and other comprehensive income (loss), as applicable. The amount allocated to continuing operations is the income tax effect of the pretax income or loss from continuing operations that occurred during the year, plus or minus income tax effects of (i) changes in certain circumstances that cause a change in judgment about the realization of deferred tax assets in future years, including the valuation of deferred tax assets due to changes in enacted income tax rates (ii) changes in income tax laws or rates, and (iii) changes in income tax status, subject to certain exceptions. The amount allocated to other comprehensive income (loss) is related solely to changes in the valuation allowance on items that are normally accounted for in other comprehensive income (loss) such as unrealized gains or losses on available-for-sale securities. In accordance with ASC 740-10, Accounting for Uncertainty in Income Taxes, uncertain tax positions are recognized if it is more likely than not, based on technical merits, that the tax position will be realized or sustained upon examination. The term more likely than not means a likelihood of more than 50 percent; the terms realized or sustained upon examination also include resolution of the related appeals or litigation processes, if any. A tax position that meets the more likely than not recognition threshold is initially and subsequently measured as the largest amount of tax benefit that has a greater than 50 percent likelihood of being realized upon settlement with a taxing authority that has full knowledge of all relevant information. The determination of whether or not a tax position has met the more likely than not recognition threshold considers the facts, circumstances and information available at the reporting date. Pinnacle Financial and its subsidiaries file consolidated U.S. Federal and state income tax returns. Each entity provides for income taxes based on its contribution to income or loss of the consolidated group. Pinnacle Financial has a Real Estate Investment Trust subsidiary that files a separate federal tax return, but its income is included in the consolidated group's return as required by the federal tax laws. Pinnacle Financial remains open to audit under the statute of limitations by the IRS and the states in which Pinnacle operates for the years ended December 31, 2016 through 2019. Pinnacle Financial's policy is to recognize interest and/or penalties related to income tax matters in income tax expense. No amounts were accrued for interest and/or penalties at December 31, 2019 or 2018. Pinnacle Financial's policy is to recognize interest and/or penalties related to income tax matters in income tax expense. Income Per Common Share — Basic net income per common share (EPS) is computed by dividing net income by the weighted average common shares outstanding for the period. Diluted EPS reflects the dilution that could occur if securities or other contracts to issue common stock were exercised or converted. The difference between basic and diluted weighted average shares outstanding is attributable to common stock options, restricted share awards, and restricted share unit awards. The dilutive effect of outstanding options, restricted share awards, and restricted share unit awards is reflected in diluted EPS by application of the treasury stock method. As of December 31, 2019, there were 119,274 stock options outstanding to purchase common shares. For the years ended December 31, 2019, 2018 and 2017, respectively, 399,600, 338,545 and 567,611 of dilutive stock options, dilutive restricted shares and restricted share units were included in the diluted earnings per share calculation under the treasury stock method. For the years ended December 31, 2019 and 2018, there were 160,492 and 253,193, respectively, restricted shares excluded from the calculation because they were deemed to be antidilutive. For the year ended December 31, 2017, there were no stock options, restricted shares and restricted share units excluded from the calculation because they were deemed to be antidilutive. The following is a summary of the basic and diluted earnings per share calculation for each of the years in the three-year period ended December 31, 2019 (dollars in thousands except earnings per share):
| December 31, 2019 |  | December 31, 2018 |  | December 31, 2017
Basic earnings per share calculation: |  |  |  |  |
Numerator - Net income | $ | 400,881 |  |  | $ | 359,440 |  |  | $ | 173,979 |
Denominator – Weighted average common shares outstanding | 76,364,303 |  |  | 77,111,372 |  |  | 63,760,578 |
Basic net income per common share | $ | 5.25 |  |  | $ | 4.66 |  |  | $ | 2.73 |
Diluted earnings per share calculation: |  |  |  |  |
Numerator - Net income | $ | 400,881 |  |  | $ | 359,440 |  |  | $ | 173,979 |
Denominator – Weighted average common shares outstanding | 76,364,303 |  |  | 77,111,372 |  |  | 63,760,578 |
Dilutive shares contingently issuable | 399,600 |  |  | 338,545 |  |  | 567,611 |
Weighted average diluted common shares outstanding | 76,763,903 |  |  | 77,449,917 |  |  | 64,328,189 |
Diluted net income per common share | $ | 5.22 |  |  | $ | 4.64 |  |  | $ | 2.70 |
Stock-Based Compensation — Stock-based compensation expense is recognized based on the fair value of the portion of stock-based payment awards that are ultimately expected to vest, reduced for estimated forfeitures. ASC 718-20, Compensation – Stock Compensation Awards Classified as Equity requires forfeitures to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. Service based awards with multiple vesting periods are expensed over the entire requisite period as if the award were a single award. For awards with performance vesting criteria, anticipated performance is projected to determine the number of awards expected to vest, and the corresponding aggregate expense is adjusted to reflect the elapsed portion of the applicable performance period. Comprehensive Income (Loss) — Comprehensive income (loss) consists of the total of all components of comprehensive income (loss) including net income (loss). Other comprehensive income (loss) refers to revenues, expenses, gains and losses that under U.S. GAAP are included in comprehensive income (loss) but excluded from net income (loss). Currently, Pinnacle Financial's other comprehensive income (loss) consists primarily of unrealized gains and losses on securities available-for-sale, net of deferred tax expense (benefit) and unrealized gains (losses) on derivative hedging relationships. Fair Value Measurement — ASC Topic 820, Fair Value Measurements and Disclosures, which defines fair value, establishes a framework for measuring fair value in U.S. GAAP and established required disclosures about fair value measurements. ASC 820 applies only to fair value measurements that are already required or permitted by other accounting standards and increases the consistency of those measurements. The definition of fair value focuses on the exit price, i.e., the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date, not the entry price, (i.e., the price that would be paid to acquire the asset or received to assume the liability at the measurement date). The statement emphasizes that fair value is a market-based measurement; not an entity-specific measurement. Therefore, the fair value measurement should be determined based on the assumptions that market participants would use in pricing the asset or liability. Pinnacle Financial has an established process for determining fair values. Fair value is based upon quoted market prices, where available. If listed prices or quotes are not available, fair value is based upon internally developed models or processes that use primarily market-based or independently-sourced market data, including interest rate yield curves, option volatilities and third party information such as prices of similar assets or liabilities. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. Furthermore, while Pinnacle Financial believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. Recently Adopted Accounting Pronouncements — In February 2016, the FASB issued Accounting Standards Update 2016-02, Leases which requires recognition in the statement of financial position of lease right of use assets and lease liabilities by lessees for those leases classified as operating leases under previous GAAP guidance. The guidance requires that a lessee should recognize lease assets and lease liabilities as compared to previous GAAP guidance that did not require lease assets and lease liabilities to be recognized for operating leases. In July 2016, the FASB issued Accounting Standards Update 2018-10, Codification Improvements to Topic 842, Leases which provided technical corrections and improvements to ASU 2016-02. In July 2016, the FASB issued A ccounting Standards Update 2018-11, Leases (Topic 842): Targeted Improvements which provided an optional transition method to adopt the new requirements of ASU 2016-02 as of the adoption date with no adjustment to the presentation or disclosure of comparative prior periods included in the financial statements in the period of adoption. Pinnacle Financial has elected this optional transition method and has presented periods prior to adoption under the prior lease guidance of ASC Topic 840. In December 2018, the FASB issued Accounting Standards Update 2018-20, Leases (Topic 842): Narrow-Scope Improvements for Lessors. ASU 2018-20 permits lessors to account for certain taxes as lessee costs, permits lessors to exclude from revenue certain lessor costs paid by lessees directly to third parties, and requires lessors to allocate certain variable payments to lease and non-lease components. In March 2019, the FASB issued Accounting Standards Update No. 2019-01, Leases (Topic 842): Codification Improvements. The amendments in this ASU (i) reinstate the exception in Topic 842 for lessors that are not manufacturers or dealers to use cost as the fair value of the underlying asset, (ii) state that lessors that are depository and lending institutions should present principal payments received under sales type and direct financing leases within investing activities, and (iii) exempt Topic 842 from certain transition related interim disclosure requirements. ASU 2016-02 and the subsequently issued ASUs related to Topic 842 became effective for Pinnacle Financial on January 1, 2019. As part of the adoption of these updates, Pinnacle Financial has elected the following practical expedients: 1) to not reassess whether existing contracts are or contain a lease, 2) to not reassess lease classification for existing leases, 3) to not reassess initial direct costs, 4) to not separate lease components from nonlease components for real estate leases, and 5) to not recognize short term leases (12 months or less) on the balance sheet. See Note 6 for additional detail related to lease amounts recognized as of December 31, 2019 under Topic 842. In February 2018, the FASB issued Accounting Standards Update 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The amendments in this ASU addressed the income tax accounting treatment of the stranded tax effects within other comprehensive income due to the lower federal corporate tax rate included in the Tax Cuts and Jobs Act issued December 22, 2017 (Tax Act). These amendments allow an entity to make a reclassification from other comprehensive income to retained earnings for the difference between the historical corporate income tax rate and the lower corporate income tax rate included in the Tax Act. The amendments are effective for fiscal years beginning after December 15, 2018, including interim periods within those years. Pinnacle Financial has elected not to adopt this standard due to its insignificant impact on Pinnacle Financial's consolidated financial position. Newly Issued Not Yet Effective Accounting Standards — In December 2019, the FASB issued Accounting Standards Update No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes to simplify various aspects of the current guidance to promote consistent application of the standard among reporting entities by moving certain exceptions to the general principles. The amendments are effective for fiscal years beginning after December 15, 2020, with early adoption permitted. Pinnacle Financial does not plan to adopt this standard early. If this standard had been effective as of the date of the financial statements included in this report, there would have been no impact on Pinnacle Financial's consolidated financial statements. In January 2017, the FASB issued Accounting Standards Update No. 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment to simplify how entities other than private companies, such as public business entities and not-for-profit entities, are required to test goodwill for impairment by eliminating the comparison of the implied fair value of the reporting unit's goodwill with the carrying amount of that goodwill. This standard became effective for Pinnacle Financial on January 1, 2020. If this standard had been effective as of the date of the financial statements included in this report, there would have been no impact on Pinnacle Financial's consolidated financial statements. In June 2016, the FASB issued Accounting Standards Update 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments (CECL), which introduces the current expected credit losses methodology. Among other things, CECL requires the measurement of all expected credit losses for financial assets, including loans and held-to-maturity debt securities, held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. The standard requires institutions to calculate all probable and estimable losses that are expected to be incurred through the financial asset's entire contractual life through a provision for credit losses, including loans obtained as a result of any acquisition not deemed to be purchased credit deteriorated (PCD). CECL also requires the allowance for credit losses for PCD loans to be determined in a manner similar to that of other financial assets measured at amortized cost; however, the initial allowance will be added to the purchase price rather than recorded as provision expense. The disclosure of credit quality indicators related to the amortized cost of financing receivables will be further disaggregated by year of origination (or vintage). Institutions are to apply the changes through a cumulative-effect adjustment to their retained earnings as of the beginning of the first reporting period in which the standard is effective. This standard became effective for Pinnacle Financial on January 1, 2020. Pinnacle Financial has established a cross-functional CECL Steering Committee, which includes members from the accounting, treasury, credit and lending functions, with involvement from members of model risk management, independent loan review and internal audit. Pinnacle Financial leveraged both internal and external expertise in the development of the models that will be utilized in the determination of the allowance for credit losses pursuant to CECL. At this time, Pinnacle Financial is focused on refining economic forecasts and certain other key assumptions utilized in our model, finalizing model validations and internal controls, and the creation of the financial statement disclosures. Pinnacle Financial has concluded that the overall allowance for credit losses will increase upon adoption of CECL in order to provide for expected credit losses over the life of the loan portfolio. Pinnacle Financial expects the allowance for credit losses to increase from 0.48% as a percentage of total loans at December 31, 2019 to a range between 0.65% and 0.70% of total loans upon adoption of this standard, primarily resulting from the impact of adjusting from the incurred loss model to the expected loss model. The allowance for credit losses also increased due to the requirement to record an allowance on acquired loan portfolios, previously recorded at fair value. Once finalized, the cumulative effect adjustment, as a result of the adoption of this guidance, will be recorded, net of tax, as an adjustment to retained earnings effective January 1, 2020. This estimate is subject to change as key assumptions are refined and model validations are finalized. Other than those pronouncements discussed above and those which have been recently adopted, we do not believe there were any other recently issued accounting pronouncements that are expected to materially impact Pinnacle Financial. Reclassifications — Some items in the prior year financial statements were reclassified to conform to the current presentation. Reclassifications had no effect on prior year net income or stockholders' equity. Subsequent Events — ASC Topic 855, Subsequent Events, establishes general standards of accounting for and disclosure of events that occur after the balance sheet date but before financial statements are issued. Pinnacle Financial evaluated all events or transactions that occurred after December 31, 2019 through the date of the issued financial statements.

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