Basis of Presentation	9 Months Ended
Sep. 30, 2015
Accounting Policies [Abstract]
Basis of Presentation	BASIS OF PRESENTATION General The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles ("GAAP") for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all information or footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments, consisting of normal and recurring items, necessary for a fair presentation of the consolidated financial statements have been made. These interim financial statements should be read in conjunction with the audited consolidated financial statements and footnote disclosures for IBERIABANK Corporation (the “Company”) previously filed with the Securities and Exchange Commission (the “SEC”) in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014. Operating results for the three and nine month periods ended September 30, 2015 are not necessarily indicative of the results that may be expected for the year ended December 31, 2015. The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries, IBERIABANK, Lenders Title Company (“LTC”), IBERIA Capital Partners, LLC (“ICP”), 1887 Leasing, LLC, IBERIA Asset Management, Inc. (“IAM”), and IBERIA CDE, LLC (“CDE”). All significant intercompany balances and transactions have been eliminated in consolidation. The Company offers commercial and retail banking products and services to customers throughout locations in seven states through IBERIABANK. The Company also operates mortgage production offices in 10 states through IBERIABANK Mortgage Company (“IMC”), a subsidiary of IBERIABANK, 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. 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. CDE is engaged in the purchase of tax credits. 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 net income, shareholders’ equity or cash flows. Louisiana Business Corporation Act Effective January 1, 2015, companies incorporated under Louisiana law became subject to the Louisiana Business Corporation Act (which replaced the Louisiana Business Corporation Law). Provisions of the Louisiana Business Corporation Act eliminate the concept of treasury stock and provide that shares reacquired by a company are to be treated as authorized but unissued shares. As a result of this change in law, shares previously classified as treasury stock are presented as a reduction to issued shares of common stock in the consolidated financial statements as of September 30, 2015, reducing the stated value of common stock and additional paid-in capital. 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, accounting for loans covered by loss sharing arrangements with the FDIC and the related loss share receivables, and determination of the fair value of net assets acquired in acquisitions. Concentrations of Credit Risk Most of the Company’s business activity is with customers located within the states of Louisiana, Florida, Arkansas, Alabama, Texas, Tennessee and Georgia. 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 larger consumer 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 value of the collateral upon default of the borrowers. The Company does not have any significant concentrations to any one industry or customer.

BASIS OF PRESENTATION

General

The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles ("GAAP") for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all information or footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments, consisting of normal and recurring items, necessary for a fair presentation of the consolidated financial statements have been made. These interim financial statements should be read in conjunction with the audited consolidated financial statements and footnote disclosures for IBERIABANK Corporation (the “Company”) previously filed with the Securities and Exchange Commission (the “SEC”) in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014. Operating results for the three and nine month periods ended September 30, 2015 are not necessarily indicative of the results that may be expected for the year ended December 31, 2015.

The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries, IBERIABANK, Lenders Title Company (“LTC”), IBERIA Capital Partners, LLC (“ICP”), 1887 Leasing, LLC, IBERIA Asset Management, Inc. (“IAM”), and IBERIA CDE, LLC (“CDE”). All significant intercompany balances and transactions have been eliminated in consolidation.

The Company offers commercial and retail banking products and services to customers throughout locations in seven states through IBERIABANK. The Company also operates mortgage production offices in 10 states through IBERIABANK Mortgage Company (“IMC”), a subsidiary of IBERIABANK, 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. 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. CDE is engaged in the purchase of tax credits.

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 net income, shareholders’ equity or cash flows.

Louisiana Business Corporation Act

Effective January 1, 2015, companies incorporated under Louisiana law became subject to the Louisiana Business Corporation Act (which replaced the Louisiana Business Corporation Law). Provisions of the Louisiana Business Corporation Act eliminate the concept of treasury stock and provide that shares reacquired by a company are to be treated as authorized but unissued shares. As a result of this change in law, shares previously classified as treasury stock are presented as a reduction to issued shares of common stock in the consolidated financial statements as of September 30, 2015, reducing the stated value of common stock and additional paid-in capital.

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, accounting for loans covered by loss sharing arrangements with the FDIC and the related loss share receivables, and determination of the fair value of net assets acquired in acquisitions.

Concentrations of Credit Risk

Most of the Company’s business activity is with customers located within the states of Louisiana, Florida, Arkansas, Alabama, Texas, Tennessee and Georgia. 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 larger consumer 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 value of the collateral upon default of the borrowers. The Company does not have any significant concentrations to any one industry or customer.