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Summary of Significant Accounting Policies (Policies)
12 Months Ended
Dec. 31, 2014
Summary of Significant Accounting Policies [Abstract]  
Basis of Presentation
Basis of Presentation — These consolidated financial statements include the accounts of Pinnacle Financial and its wholly-owned subsidiaries. PNFP Statutory Trust I, PNFP Statutory Trust II, PNFP Statutory Trust III, and PNFP Statutory Trust IV are affiliates of Pinnacle Financial and 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
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 intangible assets, the valuation of other real estate owned and the valuation of deferred tax assets.

Impairment
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 has $2.9 million and $3.8 million of long-lived amortizing intangibles at December 31, 2014 and 2013, respectively.

Goodwill is evaluated for impairment at least annually and more frequently if events and circumstances indicate that the asset might be impaired.  That annual assessment date for Pinnacle Financial is September 30.  An impairment loss is recognized to the extent that the carrying amount exceeds fair value.

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 it is necessary, or if a qualitative assessment is not performed, it is required to perform a two-step goodwill impairment test to identify potential goodwill impairment and measure the amount of goodwill impairment loss to be recognized for that reporting unit (if any). If, based on a qualitative assessment, 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 qualitative assessment as of September 30, 2014. The results of the qualitative assessment indicated that the fair value of Pinnacle Financial's 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 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.  Specific factors that could negatively impact the assumptions used include the following: a change in the control premium being realized in the market or a meaningful change in the number of mergers and acquisitions occurring; the amount of expense savings that may be realized in an acquisition scenario; significant fluctuations in our asset/liability balances or the composition of our balance sheet; a change in the overall valuation of the stock market, specifically bank stocks; performance of Southeast U.S. Banks; and Pinnacle Bank's performance relative to peers. Changing these assumptions, or any other key assumptions, could have a material impact on the amount of goodwill impairment, if any. Pinnacle Financial had $243.5 million of goodwill at December 31, 2014 related to the acquisition of Cavalry Bancorp, Inc. and Mid America Bancshares, Inc. in 2006 and 2007, respectively.
Cash Equivalents and Cash Flows
 
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, 2014 as follows:
 
  
For the years ended December 31,
 
  
2014
  
2013
  
2012
 
Cash Payments:
  
Interest
 
$
13,414,134
  
$
16,020,132
  
$
23,506,632
 
Income taxes paid
  
31,350,000
   
27,150,000
   
10,249,106
 
Noncash Transactions:
            
Loans charged-off to the allowance for loan losses
  
7,702,661
   
17,252,736
   
19,657,061
 
Loans foreclosed upon with repossessions transferred to other real estate
  
4,649,852
   
4,630,251
   
9,052,792
 
Available-for-sale securities transferred to held-to-maturity portfolio
  
-
   
39,959,647
   
-
 
 
Securities
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
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 their 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 Financial 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 issuers 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. 

Mortgage loans held-for-sale
Mortgage loans held-for-sale — Mortgage 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 operations in gains on mortgage loans sold, net of related costs such as compensation expenses.  Pinnacle Financial does not securitize mortgage loans and does not retain the servicing for loans sold.

Loans
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 the allowance for loan losses 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, 2014 and 2013, net deferred loan fees of $1.4 million and $993,000 respectively, were included in 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-impaired or doubtful-impaired.  Pinnacle Financial believes that our categories follow those outlined by Pinnacle Bank's primary federal regulator. At December 31, 2014, approximately 74% of our loan portfolio was assigned a specifically assigned risk rating in the allowance for loan loss assessment. 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 homogenous 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.
 
Allowance for Loan Losses
Allowance for Loan Losses (allowance) Our 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.

In assessing the adequacy of the allowance, we also consider the results of our ongoing independent loan review process. We undertake this process both to ascertain those loans in the portfolio with elevated credit risk and to assist in our overall evaluation of the risk characteristics of the entire loan portfolio. Our 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. We incorporate relevant loan review results in the aallowance.

Our 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 risk in our performing loan portfolio. The component of the allowance for nonperforming loans generated by ASC 310-10-35 is the result of a loan-by-loan analysis of impaired loans $250,000 and greater done by segment and the resulting impairment percentage is applied to all loans below $250,000.
 
The ASC 450-20 component of the allowance for loan losses begins with a process of estimating the probable losses based on our internal system of risk ratings and historical loss data for our risk rated portfolio. Prior to 2010, because of our limited loss history, loss estimates were primarily derived from historical loss data by loan categories for comparable peer institutions. During 2010, we incorporated the results of our own historical migration analysis of all loans that were charged-off during the prior eight quarters. The look-back period in our migration analysis was extended in 2011 to eleven quarters to continue to include the losses incurred in the second quarter of 2009. Subsequently, we have increased our look-back period each quarter to include the most recent quarters' loss history for a total of 23 quarters as of December 31, 2014. In this current economic environment, we believe the extension of our look-back period in our migration analysis has been appropriate due to the risks inherent in our loan portfolio. Additionally, as the most recent 12 quarters are considered more relevant in this current economic cycle, they have been weighted more than the earliest 11 quarters. The weighting of these quarters is determined based upon our assessment of the relevance of each quarter in the economic cycle. During the fourth quarter of 2014, we validated our loss emergence period in order to improve our assessment of the migration loss analysis. The loss emergence period is the length of time from an initial event which triggered the eventual loss to the recognition of the loss. The loss emergence period was determined for each segment of loans and then applied to the resulting loss migration analysis. The application of a loss emergence period adjusts the migration analysis for each loan category to a more precise length of time which may be greater than or less than one year. This migration analysis assists in evaluating loan loss allocation rates for the various risk grades assigned to loans in our portfolio.

The allowance allocation for non risk-rated portfolios is based on consideration of our actual historical loss rates and are evaluated as a group by category rather than on an individual loan basis because these loans are smaller and homogeneous. We weight the allocation methodologies for the non risk-rated loan portfolio and determine a weighted average allocation for these portfolios.
 
For the performing loans, the estimated loan loss allocation for all loan segments is then adjusted for management's estimate of probable losses for a number of environmental factors that have not been fully considered in either the loan by loan impairment or migration analyses. The environmental categories and the related benchmarks used to quantify the risks within each of these categories are subjectively selected by management and in accordance with our approved methodology. The data for each measurement against the benchmarks is determined from both internal and external sources. The resulting measurements are assigned a risk factor against the non impaired loan portfolio based upon where each measurement falls on a pre-determined level of risk on a nine point scale. This amount represents estimated probable inherent credit losses which exist, but have not yet been identified either in our risk rating or impairment process, as of the balance sheet date, and is based upon quarterly trend assessments in various concentrations, policy exceptions, economic conditions, loan volume changes, independent loan review, collateral considerations, trends in credit quality, trends in competition and regulatory requirements, enterprise wide risk assessments, modeling risks within the allowance process and peer group credit quality. These environmental factors are considered for each of the five loan segments, and the allowance allocation, as determined by the processes noted above for each segment, is increased or decreased based on the incremental assessment of these various environmental factors.

The ASC 450-20 portion of the allowance also includes an unallocated component. We believe 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 our credit risk ratings process.

The second component of the allowance for loan losses 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.
For nonaccrual loans and troubled debt restructurings less than $250,000, Pinnacle Financial assigns a valuation allowance to these loans utilizing an allocation rate equal to the allocation rate calculated for loans of a similar type greater than $250,000. In addition, Pinnacle Financial reviews impaired collateral dependent loans less than $250,000 to determine if any amounts should be charged-off pursuant to regulatory requirements. At December 31, 2014, the principal balance of these small impaired loans was $5.3 million, which represented 21.0% of all impaired loans compared to $5.8 million and 15.2% of all impaired loans at December 31, 2013.
 
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. 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 collateral dependent, the principal balance of the loan is charged-off in an amount equal to the impairment measurement. The fair value of collateral dependent loans is derived primarily from collateral appraisals performed by independent third-party appraisers. Management believes it follows appropriate accounting and regulatory guidance in determining impairment and accrual status 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.

We then test the resulting allowance by comparing the balance in the allowance to historical trends and industry and peer information. Our management then evaluates the result of the procedures performed, including the results of our testing, and decides on the appropriateness of the balance of the allowance in its entirety. The audit committee of our board of directors reviews and approves the methodology and resultant allowance prior to the filing of quarterly and annual financial information.
 
While our policies and procedures used to estimate the allowance for loan losses, as well as the resultant provision for loan losses charged to operations, are considered adequate by management and are reviewed from time to time by our regulators, they are necessarily approximate and imprecise. There are factors beyond our control, such as conditions in the local, national, and international economy, a local real estate market or particular industry conditions which may negatively impact materially our asset quality and the adequacy of our allowance for loan losses and thus the resulting provision for loan losses.
 
Recently Adopted Accounting Pronouncement
 
   Recently Adopted Accounting Pronouncements —  In February 2013, the FASB issued Accounting Standards Update 2013-02, "Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income" which provides disclosure guidance on amounts reclassified out of accumulated other comprehensive income (AOCI) by component.  The adoption did not have any impact on our financial position or results of operations but has impacted our financial statement disclosure. As shown on the statement of comprehensive income for the years ended December 31, 2014, 2013 and 2012, Pinnacle Financial reclassified approximately $18,000 of net losses, net gains of $891,000 and net losses of $1.3 million, respectively, out of other comprehensive income into investment gains (losses) on sales and impairments, net of tax.
Transfers of Financial Assets
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 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 Bank is the lessee with respect to several office locations. All such leases are being accounted for as operating leases within the accompanying consolidated financial statements. Several of these leases include rent escalation clauses. Pinnacle Bank expenses the costs associated with these escalating payments over the life of the expected lease term using the straight-line method. At December 31, 2014, the deferred liability associated with these escalating rentals was approximately $2.4 million and is included in other liabilities in the accompanying consolidated balance sheets.
Other Investments
Other Investments — 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, 2014 and 2013, the cost of these investments was $15.8 million and $16.1 million, respectively.  Pinnacle Financial determined that cost approximates the fair value of these investments.  Additionally, Pinnacle Financial has recorded certain investments in other entities, at fair value, of $8.1 million and $6.7 million at December 31, 2014 and 2013, respectively. During 2014 and 2013, Pinnacle Financial recorded net gains of $690,000 and net losses of $122,000, respectively, due to changes in the fair value of these investments.  As more fully described in footnote 10, Pinnacle Financial has an investment in four Trusts valued at $2.5 million as of December 31, 2014 and 2013. 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. Also, as part of our compliance with the Community Reinvestment Act, we had investments in low income housing entities totaling $10.8 million and $7.9 million, net, as of December 31, 2014 and 2013, respectively. These investments are reflected in the accompanying consolidated balance sheets in other investments.
Other Real Estate Owned
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.  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 adequate collateral.  Upon its acquisition by Pinnacle Bank, the property is recorded at the lower of cost or fair value, based on appraised value, less selling costs estimated as of the date acquired. The difference from the loan balance 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 income or noninterest expense, as applicable.

Included in the accompanying consolidated balance sheet at December 31, 2014 is $15.1 million of OREO with related property-specific valuation allowances of $3.9 million. At December 31, 2013, OREO totaled $20.9 million with related property-specific valuation allowances of $5.7 million.  During the years ended December 31, 2014, 2013 and 2012, Pinnacle Financial incurred $664,000, $3.1 million, and $11.5 million, respectively, of net foreclosed real estate expense. $552,000 of the net foreclosed real estate expense was a realized gain on disposition and holding losses on valuations of OREO properties during 2014 and $2.0 million and $9.5 million were realized losses on dispositions and holding losses on valuations of OREO properties during 2013 and 2012, respectively.
Other Assets
Other Assets — Included in other assets as of December 31, 2014 and 2013, is approximately $2.3 million and $2.7 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, 2014, 2013, and 2012, Pinnacle Financial's amortization expense was approximately $1.1 million, $937,000, and $818,000, respectively. Software maintenance fees are capitalized in other assets and amortized over the term of the maintenance agreement.

Pinnacle Bank is the owner and beneficiary of various life insurance policies on certain key executives and certain directors. These policies are reflected in other assets in the accompanying consolidated balance sheets at their respective cash surrender values. At December 31, 2014 and 2013, the aggregate cash surrender value of these policies was approximately $92.7 million and $90.3 million, respectively. Noninterest income related to these policies was $2.4 million, $2.1 million, and $0.9 million, during the years ended December 31, 2014, 2013 and 2012, respectively.
Derivative Instruments
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 also has cash flow hedge relationships in the form of interest rate swap agreements to manage our 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 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 and does not assume perfect effectiveness through the matching of critical terms. Assessments of hedge effectiveness and measurements of hedge ineffectiveness are performed at least quarterly. The effective 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 are initially recorded in 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
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
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. This section 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. 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 (a) changes in certain circumstances that cause a change in judgment about the realization of deferred tax assets in future years, (b) changes in income tax laws or rates, and (c) 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.
 
Pinnacle Financial and its subsidiaries file consolidated U.S. Federal and State of Tennessee 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 state of Tennessee for the years ended December 31, 2011 through 2014.

Pinnacle Financial's policy is to recognize interest and/or penalties related to income tax matters in income tax expense. The amount accrued for interest and/or penalties related to State uncertain tax positions at December 31, 2014 was $140,000. No amounts were accrued for interest and/or penalties at both December 31, 2013 and December 31, 2012 . Pinnacle Financial's policy is to recognize interest and/or penalties related to income tax matters in income tax expense.
Income (Loss) Per Common Share
Income Per Common Share — Basic net income per share available to common stockholders (EPS) is computed by dividing net income available to common stockholders 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, common stock appreciation rights, restricted share awards, and restricted share unit awards. The dilutive effect of outstanding options, common stock appreciation rights, warrants, restricted share awards, and restricted share unit awards is reflected in diluted EPS by application of the treasury stock method.

As of December 31, 2014, there were approximately 695,000 stock options and 3,700 stock appreciation rights outstanding to purchase common shares. For the year ended December 31, 2014 and 2013, respectively, approximately 403,555 and 308,491 of dilutive stock options, dilutive restricted shares, restricted share units and stock appreciation rights were included in the diluted earnings per share calculation under the treasury stock method.
 
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, 2014:

  
2014
  
2013
  
2012
 
 
Basic earnings per share calculation:
      
Numerator - Net income available to common stockholders
 
$
70,471,167
  
$
57,726,201
  
$
38,069,841
 
             
Denominator – Weighted average common shares outstanding
  
34,723,335
   
34,200,770
   
33,899,667
 
Basic net income per common share available to common stockholders
 
$
2.03
  
$
1.69
  
$
1.12
 
             
Diluted earnings per share calculation:
            
Numerator - Net income available to common stockholders
 
$
70,471,167
  
$
57,726,201
  
$
38,069,841
 
             
Denominator – Weighted average common shares outstanding
  
34,723,335
   
34,200,770
   
33,899,667
 
Dilutive shares contingently issuable
  
403,555
   
308,491
   
588,141
 
Weighted average diluted common shares outstanding
  
35,126,890
   
34,509,261
   
34,487,808
 
Diluted net income per common share available to common stockholders
 
$
2.01
  
$
1.67
  
$
1.10
 
Stock-Based Compensation
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 performance period.
Comprehensive Income (Loss)
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. generally accepted accounting principles are included in comprehensive income (loss) but excluded from net income (loss). Currently, Pinnacle Financial's other comprehensive income (loss) consists of unrealized gains and losses on securities available-for-sale, net of deferred tax expense (benefit) and unrealized gains on derivative hedging relationships.

Fair Value Measurement
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. generally accepted accounting principles 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 of 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.
Subsequent Events
 
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, 2014, through the date of the issued financial statements. On February 1, 2015, Pinnacle Financial acquired a 30% interest in Bankers Healthcare Group LLC which included additional borrowings of $40 million and is more fully discussed in Note 2 below. During this period there were no other material recognizable subsequent events that required recognition or disclosures in the December 31, 2014 financial statements.