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Summary of Significant Accounting Policies (Policies)
 6 Months Ended
Jun. 30, 2017
Accounting Policies [Abstract]  
Reclassification
Reclassifications
Certain amounts reported in prior periods have been reclassified to conform to the current period presentation. These reclassifications did not have a material effect on previously reported consolidated financial statements.
Principles of Consolidation
Principles of Consolidation
The Company’s consolidated financial statements include all entities in which the Company has a controlling financial interest under either the voting interest or variable interest model. The assessment of whether or not the Company has a controlling interest (i.e., the primary beneficiary) in a variable interest entity ("VIE") is performed on an on-going basis. All equity investments in non-consolidated VIEs are included in "other assets" in the Company’s consolidated balance sheets. The Company’s maximum exposure to loss as a result of its involvement with non-consolidated VIEs was approximately $94 million and $91 million at June 30, 2017 and December 31, 2016, respectively. The Company's maximum exposure to loss was equivalent to the carrying value of its investments and any related outstanding loans to the non-consolidated VIEs.
Investments in entities that are not consolidated are accounted for under either the equity, cost, or proportional amortization method of accounting. Investments for which the Company has the ability to exercise significant influence over the operating and financing decisions of the entity are accounted for under the equity method. Investments for which the Company does not hold such ability are accounted for under the cost method. Investments in qualified affordable housing projects, which meet certain criteria, are accounted for under the proportional amortization method.
The consolidated financial statements include the accounts of the Company and its subsidiaries, IBERIABANK; Lenders Title Company; IBERIA Capital Partners, LLC; 1887 Leasing, LLC; IBERIA Asset Management, Inc.; 840 Denning, LLC; and IBERIA CDE, LLC. Effective January 1, 2017, IBERIABANK Mortgage Company, previously a subsidiary of IBERIABANK, merged into IBERIABANK. All significant intercompany balances and transactions have been eliminated in consolidation.
Nature of Operations
Nature of Operations
The Company offers commercial and retail banking products and services to customers throughout locations in eight states through IBERIABANK. The Company also operates mortgage production offices in 10 states and offers a full line of title insurance and closing services throughout Arkansas and Louisiana through LTC and its subsidiaries. ICP provides equity research, institutional sales and trading, and corporate finance services throughout the energy industry. 1887 Leasing, LLC owns an aircraft used by management of the Company. IAM provides wealth management and trust services for commercial and private banking clients. 840 Denning, LLC invests in a commercial rental property. CDE is engaged in the purchase of tax credits.
Use of Estimates
Use of Estimates
The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. Material estimates that are susceptible to significant change in the near term are the allowance for credit losses, valuation of and accounting for acquired loans, goodwill and other intangibles, and income taxes.
Concentration of Credit Risks
Concentrations of Credit Risk
Most of the Company’s business activity is with customers located in the southeastern United States. The Company’s lending activity is concentrated in its market areas in those states. The Company has emphasized originations of commercial loans and private banking loans, defined as loans to higher net worth clients. Repayments on loans are expected to come from cash flows of the borrower and/or guarantor. Losses on secured loans are limited by the net realizable value of the collateral upon default of the borrowers and guarantor support. Concentrations in commercial real estate have increased as a result of the Company's organic growth and recent acquisitions of banks with significant CRE portfolios. Additionally, as the Company has executed its risk-off strategy over the past two years, CRE concentrations have naturally increased as a percentage of the total portfolio. The Company believes it does not have any excessive concentrations to any one industry or customer.
Recent Accounting Pronouncements
Pronouncements adopted during the six months ended June 30, 2017:
ASU No. 2016-09
The Company adopted the amendments of ASU No. 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, effective January 1, 2017 as follows: (i) prospective adoption of the recognition of excess tax benefits associated with awards which vested or settled during the six months ended June 30, 2017 in the statement of comprehensive income; (ii) prospective adoption of the exclusion of excess tax benefits from assumed proceeds for the calculation of diluted EPS for the six months ended June 30, 2017; (iii) modified retrospective adoption of the minimum statutory withholdings requirements; (iv) modified retrospective adoption of the accounting policy election to account for forfeitures as they occur; and (v) prospective adoption of the classifications of certain cash flows associated with stock compensation. The adoption of these amendments did not, either individually or in aggregate, have a significant impact to the consolidated financial statements.
ASU No. 2017-01
In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, which introduces amendments that are intended to clarify the definition of a business to assist companies and other reporting organizations in evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The amendments will be applied prospectively and are effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within those periods, with early adoption permitted.
The Company early-adopted the amendments effective January 1, 2017. The adoption of this ASU did not and is not expected to have a significant impact on the Company’s consolidated financial statements.
Pronouncements issued but not yet adopted:
ASU No. 2014-09
In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which implements a common revenue standard and clarifies the principles used for recognizing revenue. The amendments in the ASU clarify that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.
The amendments in ASU No. 2014-09 will be effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. The amendments will be applied through the election of one of two retrospective methods.
The Company will adopt the amendments beginning January 1, 2018 through the modified-retrospective transition method. A significant amount of the Company’s revenues are derived from net interest income on financial assets and liabilities, which are excluded from the scope of the amended guidance. Preliminary results indicate that certain noninterest income financial statement line items, including service charges on deposit accounts, trust and investment management income, and other noninterest income, contain revenue streams that are in scope of these updates. Based on the Company’s preliminary scoping, walkthroughs, and contract reviews, it does not expect to recognize a significant cumulative adjustment to equity upon implementation of the standard; however, the Company is still finalizing its reviews of contracts related to certain revenue streams. Further, the Company is still evaluating the standard’s guidance for assessment of gross versus net reporting of revenues and expenses related to certain arrangements such as card interchange fees and rewards programs. The Company does not expect a significant impact to the Company’s consolidated statements of comprehensive income or consolidated balance sheets from either a presentation or timing perspective, but the Company will be subject to expanded disclosure requirements.  The Company is in the process of developing additional quantitative and qualitative disclosures that will be required upon adoption of the new revenue recognition standard.
ASU No. 2016-01
In January 2016, the FASB issued ASU No. 2016-01, Financial Statements - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The amendments will not change the guidance for classifying and measuring investments in debt securities or loans; however, the ASU will impact how the Company measures certain equity investments and discloses and presents certain financial instruments through the application of the “exit price” notion.
ASU No. 2016-01 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. An entity will record a cumulative-effect adjustment to beginning retained earnings as of the beginning of the first reporting period in which the guidance is adopted, with two exceptions. The amendments related to equity investments without readily determinable fair values (including disclosure requirements) will be applied prospectively. The requirement to use the “exit price” notion to measure the fair value of financial instruments for disclosure purposes will also be applied prospectively.
The Company does not expect a significant cumulative-effect adjustment to be recorded at adoption or any significant impact to the consolidated financial statements associated with the accounting for its current equity investments. The Company does anticipate financial statement disclosures to be impacted, specifically related to financial instruments measured at amortized cost whose fair values are disclosed under the “entry price” notion, but is currently still in the process of developing the appropriate methodology to measure fair value under the “exit price” notion and determining the impact.
ASU No. 2016-02
In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The most significant amendment to existing GAAP is the recognition of lease assets (i.e., right of use assets) and liabilities on the balance sheet for leases that are classified as operating leases by lessees. The lessor model remains similar to the current accounting model in existing GAAP. Additional amendments include, but are not limited to, the elimination of leveraged leases; modification to the definition of a lease; amendments on sale and leaseback transactions; and disclosure of additional quantitative and qualitative information.
ASU 2016-02 will be effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with early adoption permitted. Lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The Company will adopt the amendments on January 1, 2019.
The Company occupies certain banking offices and equipment under operating lease agreements, which currently are not recognized in the consolidated balance sheets. Based on the Company’s preliminary analysis of its current portfolio, the impact to the Company’s consolidated balance sheets is estimated to result in less than a 1% increase in assets and liabilities. The Company is also currently assessing the practical expedients it may elect at adoption, the final determination of the incremental borrowing rate, and the impact to the regulatory capital ratios; amongst other matters associated with the standard.
The adjustment to retained earnings is not expected to be significant based on the transition guidance associated with current sale-leaseback agreements. The Company also anticipates additional disclosures to be provided at adoption.
ASU No. 2016-13
In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The amendments introduce an impairment model that is based on expected credit losses (“ECL”), rather than incurred losses, to estimate credit losses on certain types of financial instruments (e.g., loans and held-to-maturity securities), including certain off-balance sheet financial instruments (e.g., loan commitments). The ECL should consider historical information, current information, and reasonable and supportable forecasts, including estimates of prepayments, over the contractual term. Financial instruments with similar risk characteristics may be grouped together when estimating the ECL.
The ASU also amends the current AFS security impairment model for debt securities. The new model will require an estimate of ECL when the fair value is below the amortized cost of the asset through the use of an allowance to record estimated credit losses (and subsequent recoveries). Non-credit related losses will continue to be recognized through OCI.
In addition, the amendments provide for a simplified accounting model for purchased financial assets with a more-than-insignificant amount of credit deterioration since their origination. The initial estimate of expected credit losses would be recognized through an ALL with an offset (i.e., increase) to the cost basis of the related financial asset at acquisition.
ASU 2016-13 will be effective for fiscal years beginning after December 15, 2019, including interim periods. The amendments will be applied through a modified-retrospective approach, resulting in a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. A prospective transition approach is required for debt securities for which OTTI had been recognized before the effective date. Amounts previously recognized in AOCI as of the date of adoption that relate to improvements in cash flows expected to be collected should continue to be accreted into income over the remaining life of the asset. Recoveries of amounts previously written off relating to improvements in cash flows after the date of adoption should be recorded in earnings when received.
The Company is currently evaluating the impact of the ASU on the Company’s consolidated financial statements.


ASU No. 2017-04
In January 2017, the FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment, which simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test.  Therefore, any carrying amount which exceeds the reporting unit’s fair value (up to the amount of goodwill recorded) will be recognized as an impairment loss.
ASU No. 2017-04 will be effective for annual reporting periods beginning after December 15, 2019, including interim reporting periods within those periods.  The amendments will be applied prospectively on or after the effective date.  Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017.  Based on recent goodwill impairments tests, which did not require the application of Step 2, the Company does not expect the adoption of this ASU to have an immediate impact.