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Summary of Significant Acounting Policies (Policies)

12 Months Ended

Dec. 31, 2012

Enterprise Financial Services Corp and subsidiaries (the “Company” or “Enterprise”) is a financial holding company that provides a full range of banking and wealth management services to individuals and corporate customers located in the St. Louis, Kansas City and Phoenix metropolitan markets through its banking subsidiary, Enterprise Bank & Trust (the “Bank”). The consolidated financial statements include the accounts of the Company, and its subsidiaries, all of which are wholly owned. All intercompany accounts and transactions have been eliminated.

Since 2009, the Bank has entered into four transactions with the Federal Deposit Insurance Corporation (“FDIC”) to acquire the following failed banks:


•	On December 11, 2009, the Bank entered into an agreement with the FDIC and acquired certain assets and assumed certain liabilities of Valley Capital Bank N.A. (“Valley Capital”), a full service community bank that was headquartered in Mesa, Arizona.


•	On July 9, 2010, the Bank entered into a loan sale agreement with the FDIC to purchase the loans originated and other real estate acquired by the Arizona operations of Home National Bank (“Home National”), of Blackwell, Oklahoma.


•	On January 7, 2011, the Bank entered into an agreement with the FDIC and acquired certain assets and assumed certain liabilities of Legacy Bank (“Legacy”), a full service community bank that was headquartered in Scottsdale, Arizona.


•	On August 12, 2011, the Bank entered into an agreement with the FDIC and acquired certain assets and assumed certain liabilities of The First National Bank of Olathe (“FNBO”), a full service community bank that was headquartered in Olathe, Kansas.

On October 21, 2011, the Bank purchased certain assets and assumed certain deposit liabilities associated with a BankLiberty branch located at 11401 Olive Boulevard, in the St. Louis suburb of Creve Coeur, Missouri.

See Note 2 - Acquisitions for more information on the above transactions.

The Company is subject to competition from other financial and nonfinancial institutions providing financial services in the markets served by the Company's subsidiary. Additionally, the Company and its banking subsidiary are subject to the regulations of certain federal and state agencies and undergo periodic examinations by those regulatory agencies.

Use of Estimates

The consolidated financial statements of the Company have been prepared in conformity in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”.) In preparing the consolidated financial statements, management is required to make estimates and assumptions, which significantly affect the reported amounts in the consolidated financial statements. Such estimates include the valuation of loans, goodwill, intangible assets, indemnification assets, and other long-lived assets, along with assumptions used in the calculation of income taxes, among others. These estimates and assumptions are based on management's best estimates and judgment. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment, which management believes to be reasonable under the circumstances. Management adjusts such estimates and assumptions when facts and circumstances dictate. Decreased real estate values, volatile credit markets, and persistent high unemployment have combined to increase the uncertainty inherent in such estimates and assumptions. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in those estimates resulting from continuing changes in the economic environment will be reflected in the financial statements in future periods.

Cash Flow Information

For purposes of reporting cash flows, the Company considers cash and due from banks, interest-bearing deposits and federal funds sold to be cash and cash equivalents.

Investments

The Company has classified all investments in debt securities as available for sale.

Securities classified as available for sale are carried at fair value. Unrealized holding gains and losses for available for sale securities are excluded from earnings and reported as a net amount in a separate component of shareholders' equity until realized. All previous fair value adjustments included in the separate component of shareholders' equity are reversed upon sale.

Declines in the fair value of securities below their cost that are deemed to be other-than-temporary are reflected in operations as realized losses. In estimating other-than-temporary impairment losses, management systematically evaluates investment securities for other-than-temporary declines in fair value on a quarterly basis. This analysis requires management to consider various factors, which include (1) the present value of the cash flows expected to be collected compared to the amortized cost of the security, (2) duration and magnitude of the decline in value, (3) the financial condition of the issuer or issuers, (4) structure of the security, and (5) the intent to sell the security or whether it's more likely than not that the Company would be required to sell the security before its anticipated recovery in market value.

Premiums and discounts are amortized or accreted over the expected lives of the respective securities as an adjustment to yield using the interest method. Dividend and interest income is recognized when earned. Realized gains and losses are included in earnings and are derived using the specific identification method for determining the cost of securities sold.

Loans Receivable

The Company provides long-term financing of one-to-four-family residential real estate by originating fixed and variable rate loans. Long-term fixed and variable rate loans are sold into the secondary market with limited recourse. Upon receipt of an application for a real estate loan, the Company determines whether the loan will be sold into the secondary market or retained in the Company's loan portfolio. The interest rates on the loans sold are locked with the buyer and the Company bears no interest rate risk related to these loans. Mortgage loans held for sale are carried at the lower of cost or fair value, which is determined on a specific identification method. The Company does not retain servicing on any loans sold, nor did the Company have any capitalized mortgage servicing rights at December 31, 2012 or 2011. Gains on the sale of loans held for sale are reported net of direct origination fees and costs in the Company's consolidated statements of operations.

Portfolio Loans

Loans are reported at the principal balance outstanding net of unearned fees and costs. Loan origination fees and direct origination costs are deferred and recognized over the lives of the related loans as a yield adjustment using a method which approximates the interest method.

Interest income on loans is accrued to income based on the principal amount outstanding. The recognition of interest income is discontinued when a loan becomes 90 days past due or a significant deterioration in the borrower's credit has occurred which, in management's opinion, negatively impacts the collectability of the loan. Unpaid interest on such loans is reversed at the time the loan becomes uncollectable and subsequent interest payments received are applied to principal if any doubt exists as to the collectability of such principal; otherwise, such receipts are recorded as interest income. Loans that have not been restructured are returned to accrual status when management believes full collectability of principal and interest is expected. Non-accrual loans that have been restructured will remain in a non-accrual status until the borrower has made six consecutive contractual payments.

Loans Acquired Through Transfer

Loans acquired through the completion of a transfer, including loans acquired in a business combination that have evidence of deterioration of credit quality since origination and for which it is probable, at acquisition, that the Company will be unable to collect all contractually required payments receivable, are initially recorded at fair value (as determined by the present value of expected future cash flows) with no valuation allowance. The difference between the undiscounted cash flows expected at acquisition and the investment in the loans, or the “accretable yield,” is recognized as interest income on a level-yield method over the life of the loans. Contractually required payments for interest and principal that exceed the undiscounted cash flows expected at acquisition, or the “nonaccretable difference,” are not recognized as a yield adjustment or as a loss accrual or a valuation allowance. The Company aggregates individual loans with common risk characteristics into pools of loans. Increases in expected cash flows subsequent to the initial investment are recognized prospectively through adjustment of the yield on the loans over their remaining lives. Decreases in expected cash flows due to an inability to collect contractual cash flows are recognized as impairment through the provision for loan losses account. Any allowance for loan loss on these pools reflect only losses incurred after the acquisition (meaning the present value of all cash flows expected at acquisition that ultimately are not to be received). Any disposals of loans, including sales of loans, payments in full or foreclosures result in the removal of the loan from the loan pool at the carrying amount with differences in actual results reflected in interest income.

Allowance for Loan Losses

Loans are charged-off when the book balance of any loan whose primary and secondary sources of repayment (cash flow, collateral) no longer represent viable collection alternatives and the tertiary source (guarantors) must be sued to induce honoring the guaranty.

Allowance For Loan Losses

The allowance for loan losses is increased by provision charged to expense and is available to absorb charge-offs, net of recoveries. Management utilizes a systematic, documented approach in determining the appropriate level of the allowance for loan losses. The level of the allowance reflects management's continuing evaluation of industry concentrations; specific credit risks; loan loss experience; current loan portfolio quality; present economic, political and regulatory conditions; and probable losses inherent in the current loan portfolio. The determination of the appropriate level of the allowance for loan losses inherently involves a degree of subjectivity and requires that we make significant estimates of current credit risks and future trends, all of which may undergo material changes. Changes in economic conditions affecting borrowers, new information regarding existing loans, identification of additional problem loans and other factors, both within and outside of our control, may require an increase in the allowance for loan losses.

Management believes the allowance for loan losses is adequate to absorb inherent losses in the loan portfolio. While management uses available information to recognize losses on loans, future additions to the allowance may be necessary based on changes in economic conditions and other factors. In addition, various regulatory agencies, as an integral part of the examination process, periodically review the Bank's loan portfolio. Such agencies may require additions to the allowance for loan losses based on their judgments and interpretations of information available to them at the time of their examinations.

Allowance for Loan Losses on Credit-Impaired Acquired Loans

The Company updates its cash flow projections for credit-impaired acquired loans, including loans acquired from the FDIC, on a quarterly basis. Assumptions utilized in this process include projections related to probability of default, loss severity, prepayment, extensions and recovery lag. Projections related to probability of default and prepayment are calculated utilizing a loan migration analysis. The loan migration analysis is a matrix of probability that specifies the probability of a loan pool transitioning into a particular delinquency or liquidation state given its current state at the re-measurement date. Loss severity factors are based upon industry data.

Any decreases in expected cash flows after the acquisition date and subsequent measurement periods are recognized by recording an impairment in the provision for loan losses. As a result of impairment, the FDIC loss share receivable is increased to reflect future cash to be received from the FDIC. The amount of the increase is recorded in noninterest income and is determined based on the specific loss share agreement, but is generally 80% of the losses. See Loans Acquired Through Transfer above for further discussion. Any increase in expected future cash flows due to a decrease in expected credit losses will reverse previously recorded impairment, if any, and add to the accretable yield on the loan pool, prospectively. In addition the accretion of the FDIC loss share receivable will decrease prospectively over the remaining life. Increases and decreases to the FDIC loss share receivable are recorded as adjustments to noninterest income.

Other Real Estate

Other real estate represents property acquired through foreclosure or deeded to the Company in lieu of foreclosure on loans on which the borrowers have defaulted as to the payment of principal and interest. Other real estate is recorded on an individual asset basis at the lower of cost or fair value less estimated costs to sell. The fair value of other real estate is based upon estimates of future cash flows, market value of similar assets, if available, or independent appraisals. These estimates involve significant uncertainties and judgments and cannot be determined with certainty. As a result, fair value estimates may not be realizable in a current sale or settlement of the other real estate. Subsequent reductions in fair value are expensed.

Gains and losses resulting from the sale of other real estate are credited or charged to current period earnings. Costs of maintaining and operating other real estate are expensed as incurred, and expenditures to complete or improve other real estate properties are capitalized if the expenditures are expected to be recovered upon ultimate sale of the property.

FDIC Loss Share Receivable and Clawback Liability

As part of the FDIC- assisted transactions, the Bank entered into loss sharing agreements with the FDIC. The FDIC will reimburse the Bank for a percentage of realized losses on loans and foreclosed real estate covered under the agreement (“Covered Assets”). In addition, the Bank will be reimbursed for certain expenses related to the Covered Assets. At the acquisition date, the fair value of the amount due from the FDIC (“FDIC Loss Share Receivable") was estimated based on expected losses and cash flows on the Covered Assets. The FDIC Loss Share Receivable is measured separately from the related Covered Assets and recorded separately on the balance sheet because it is not contractually embedded in the Covered Assets and is not transferable. Although these assets are contractual receivables from the FDIC, there are no contractual interest rates. See Note 2 - Acquisitions, for further information regarding these transactions.

Subsequent to initial recognition, the FDIC Loss Share Receivable is reviewed quarterly and adjusted for any changes in expected cash flows. These adjustments are measured on the same basis as the related Covered Assets. Any decrease in expected cash flows due to an increase in expected credit losses will increase the FDIC Loss Share Receivable which will partially offset the impairment recorded on the Covered loans. Any increase in expected future cash flows due to a decrease in expected credit losses will decrease the accretion of the FDIC Loss Share Receivable prospectively over the remaining life. Increases and decreases to the FDIC Loss Share Receivable are recorded as adjustments to noninterest income.

As stipulated in some of its agreements with the FDIC, the Company may be required to reimburse the FDIC if certain levels of cash flows are met over the duration of a loss share agreement. This reimbursement, or clawback liability, is measured quarterly over the duration of the agreement.

Fixed Assets

Buildings, leasehold improvements, and furniture, fixtures, equipment, and capitalized software are stated at cost less accumulated depreciation. All categories are computed using the straight-line method over their respective estimated useful lives. Furniture, fixtures and equipment is depreciated over three to ten years, buildings and leasehold improvements over ten to forty years, and capitalized software over three years based upon estimated lives or lease obligation periods.

Tax Credits Held For Sale

The Company has purchased the rights to receive 10-year streams of state tax credits at agreed upon discount rates and sells such tax credits to wealth management customers and others. All state tax credits purchased prior to 2009 are accounted for at fair value. All state tax credits purchased since 2009 are accounted for at cost. The Company elected not to account for the state tax credits purchased since 2009 at fair value in order to limit the volatility of the fair value changes in the Company's consolidated statements of operations.

Cash Surrender Value of Life Insurance

The Company has purchased bank-owned life insurance policies on certain bank officers. Bank-owned life insurance is recorded at its cash surrender value. Changes in the cash surrender values are included in noninterest income.

Federal Home Loan Bank Stock

The Bank, as a member of the Federal Home Loan Bank of Des Moines (“FHLB”), is required to maintain an investment in the capital stock of the FHLB. The stock is redeemable at par by the FHLB, and is therefore, carried at cost and periodically evaluated for impairment. The Company records FHLB dividends in income on the ex-dividend date.

Goodwill and Other Intangible Assets

The Company tests goodwill for impairment on an annual basis and whenever events or changes in circumstances indicate that the Company may not be able to recover the respective asset's carrying amount. Such tests involve the use of estimates and assumptions. Core deposit intangibles are amortized using an accelerated method over an estimated useful life of approximately 10 years.

The Company identifies potential goodwill impairments by comparing the fair value of a reporting unit to its carrying amount, including goodwill. Goodwill impairment is not indicated as long as the fair value of the reporting unit is greater than its carrying value. The second step of the impairment test is only required if a goodwill impairment is identified in step one. The second step of the test compares the implied fair value of goodwill to its carrying amount. If the carrying amount of goodwill exceeds its implied fair value, an impairment loss is recognized. That loss is equal to the carrying amount of goodwill that is in excess of its implied fair market value.

Impairment of Long-Lived Assets

Long-lived assets, such as fixed assets and purchased intangibles subject to amortization, 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 in the amount by which the carrying amount of the asset exceeds the fair value of the asset. Assets to be disposed of are 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. The assets and liabilities of a disposal group classified as held for sale are presented separately in the appropriate asset and liability sections of the balance sheet.

Derivatives

The Company uses derivative financial instruments to assist in the management of interest rate sensitivity and to modify the repricing, maturity and option characteristics of certain assets and liabilities. In addition, the Company also offers an interest rate hedge program that includes interest rate swaps to assist its customers in managing their interest rate risk profile. In order to eliminate the interest rate risk associated with offering these products, the Company enters into derivative contracts with third parties to offset the customer contracts.

Derivative instruments are required to be measured at fair value and recognized as either assets or liabilities in the consolidated financial statements. Fair value represents the payment the Company would receive or pay if the item were sold or bought in a current transaction. The accounting for changes in fair value (gains or losses) of a hedged item is dependent on whether the related derivative is designated and qualifies for “hedge accounting.” The Company assigns derivatives to one of these categories at the purchase date: cash flow hedge, fair value hedge, or non-designated derivatives. An assessment of the expected and ongoing hedge effectiveness of any derivative designated a fair value hedge or cash flow hedge is performed as required by the accounting standards. Derivatives are included in other assets and other liabilities in the consolidated balance sheets. Generally, the only derivative instruments used by the Company have been interest rate swaps and interest rate caps.

The following is a summary of the Company's accounting policies for derivative instruments and hedging activities.

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Cash Flow Hedges - Derivatives designated as cash flow hedges are recorded at fair value. The effective portion of the change in fair value is recorded (net of taxes) as a component of other comprehensive income (“OCI”) in shareholders' equity. Amounts recorded in OCI are subsequently reclassified into interest income or expense (depending on whether the hedged item is an asset or liability) when the underlying transaction affects earnings. The ineffective portion of the change in fair value is recorded in noninterest income. Upon dedesignation of a derivative financial instrument from a cash flow hedge relationship, any remaining amounts in OCI are recorded in noninterest income over the expected remaining life of the underlying forecasted hedge transaction. The net interest differential between the hedged item and the hedging derivative financial instrument are recorded as an adjustment to interest income or interest expense of the related asset or liability.

•

Fair Value Hedges - For derivatives designated as fair value hedges, the change in fair value of the derivative instrument and related hedged item are recorded in the related interest income or expense, as applicable, except for the ineffective portion, which is recorded in noninterest income in the consolidated statements of income. The swap agreement is accounted for on an accrual basis with the net interest differential being recognized as an adjustment to interest income or interest expense of the related asset or liability.

•

Non-Designated Hedges - Certain derivative financial instruments are not designated as cash flow or as fair value hedges for accounting purposes. These non-designated derivatives are intended to provide interest rate protection on net interest income or noninterest income but do not meet hedge accounting treatment. Customer accommodation interest rate swap contracts are not designated as hedging instruments. Changes in the fair value of these instruments are recorded in interest income or noninterest income in the consolidated statements of income depending on the underlying hedged item.

All derivative financial instruments, whether designated as hedges or not, are recorded on the consolidated balance sheet at fair value within Other assets or Other liabilities. The accounting for changes in the fair value of a derivative in the consolidated statement of operations depends on whether the contract has been designated as a hedge and qualifies for hedge accounting.

Income Taxes

The Company and its subsidiaries file a consolidated federal income tax return. Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates in effect for the year in which those temporary differences are expected to be recovered or settled. A valuation allowance is recognized if the Company determines it is more likely than not that all or some portion of the deferred tax asset will not be recognized. In estimating accrued taxes, the Company assesses the relative merits and risks of the appropriate tax treatment considering statutory, judicial and regulatory guidance in the context of the tax position. Because of the complexity of tax laws and regulations, interpretation can be difficult and subject to legal judgment given specific facts and circumstances. It is possible that others, given the same information, may at any point in time reach different reasonable conclusions regarding the estimated amounts of accrued taxes.

Stock-Based Compensation

Stock-based compensation is recognized as an expense in the financial statements and measured at the grant date fair value for all equity classified awards.

Acquisitions and Divestitures

The Company accounts for business combinations using the acquisition method of accounting. Accordingly, the assets and liabilities of the acquired entities have been recorded at their estimated fair values at the date of acquisition. Goodwill represents the excess of the purchase price over the fair value of net assets, including the amount assigned to identifiable intangible assets.

The purchase price allocation process requires an estimation of the fair values of the assets acquired and the liabilities assumed. When a business combination agreement provides for an adjustment to the cost of the combination contingent on future events, the Company includes an estimate of the acquisition-date fair value as part of the cost of the combination. The results of operations of the acquired business are included in the Company's consolidated financial statements from the respective date of acquisition. As a general rule, goodwill established in connection with a stock purchase is non-deductible for tax purposes.

For divestitures, the Company measures an asset (disposal group) classified as held for sale at the lower of its carrying value at the date the asset is initially classified as held for sale or its fair value less costs to sell. The Company reports the results of operations of a component that either has been disposed of or held for sale as discontinued operations if:


•	The operations and cash flows of the disposal group will be eliminated from the ongoing operations as a result of the disposal transaction, and


•	The Company will not have any significant continuing involvement in the operations of the entity after the disposal transaction.

Any incremental direct costs incurred to transact the sale are allocated against the gain or loss on the sale. These costs would include items like legal fees, title transfer fees, broker fees, etc. Any goodwill and intangible assets associated with the portion of the reporting unit to be disposed of is included in the carrying amount of the business in determining the gain or loss on the sale.

Basic and Diluted Earnings Per Common Share

Basic earnings per common share is computed by dividing net income by the weighted-average number of common shares outstanding during the applicable period. Diluted earnings per share is computed using the net income and weighted-average number of shares determined for the basic earnings per common share computation plus the dilutive effect of stock compensation using the treasury stock method and convertible debt using the if-converted method.

Reclassification

Certain amounts from prior years have been reclassified to conform to the current year’s presentation.

Marketable securities

The unrealized losses at both December 31, 2012, and December 31, 2011, were primarily attributable to changes in market interest rates since the securities were purchased. Management systematically evaluates investment securities for other-than-temporary declines in fair value on a quarterly basis. This analysis requires management to consider various factors, which include (1) the present value of the cash flows expected to be collected compared to the amortized cost of the security, (2) duration and magnitude of the decline in value, (3) the financial condition of the issuer or issuers, (4) structure of the security and (5) the intent to sell the security or whether it is more likely than not that the Company would be required to sell the security before its anticipated recovery in market value. At December 31, 2012, management performed its quarterly analysis of all securities with an unrealized loss and concluded no individual securities were other-than-temporarily impaired.