X0306 5 2018-12-31 false 0 1 0000933141 IBERIABANK CORP IBKC 0001206664 KOERNER JOHN E III 200 WEST CONGRESS STREET LAFAYETTE LA 70501 true false false false Common Stock 7800.00 D Common Stock 3500.00 I By Koerner Capital LLC Phantom Stock 2018-01-02 2018-01-02 4 A false L 67.9612 77.25 A Common Stock 67.9612 67.9612 D Phantom Stock 2018-01-26 2018-01-26 4 A false L 3.6877 87.00 A Common Stock 3.6877 3.6877 D Phantom Stock 2018-02-01 2018-02-01 4 A false L 60.9402 86.15 A Common Stock 60.9402 60.9402 D Phantom Stock 2018-03-01 2018-03-01 4 A false L 65.2985 80.40 A Common Stock 65.2985 65.2985 D Phantom Stock 2018-04-02 2018-04-02 4 A false L 68.3149 76.85 A Common Stock 68.3149 68.3149 D Phantom Stock 2018-04-27 2018-04-27 4 A false L 5.3284 75.95 A Common Stock 5.3284 5.3284 D Phantom Stock 2018-05-01 2018-05-01 4 A false L 69.6749 75.35 A Common Stock 69.6749 69.6749 D Phantom Stock 2018-06-01 2018-06-01 4 A false L 65.0558 80.70 A Common Stock 65.0558 65.0558 D Phantom Stock 2018-07-02 2018-07-02 4 A false L 68.5826 76.55 A Common Stock 68.5826 68.5826 D Phantom Stock 2018-07-27 2018-07-27 4 A false L 5.8054 83.35 A Common Stock 5.8054 5.8054 D Phantom Stock 2018-08-01 2018-08-01 4 A false L 62.3886 84.15 A Common Stock 62.3886 62.3886 D Phantom Stock 2018-09-04 2018-09-04 4 A false L 60.6586 86.55 A Common Stock 60.6586 60.6586 D Phantom Stock 2018-10-01 2018-10-01 4 A false L 65.0961 80.65 A Common Stock 65.0961 65.0961 D Phantom Stock 2018-10-26 2018-10-26 4 A false L 8.0158 71.56 A Common Stock 8.0158 8.0158 D Phantom Stock 2018-11-01 2018-11-01 4 A false L 70.1122 74.88 A Common Stock 70.1122 70.1122 D Phantom Stock 2018-12-03 2018-12-03 4 A false L 70.2341 74.75 A Common Stock 70.2341 70.2341 D EACH SHARE OF PHANTOM STOCK REPRESENTS THE RIGHT TO RECEIVE THE CASH VALUE OF ONE SHARE OF IBKC COMMON STOCK. ACQUISITION OF PHANTOM STOCK PURSUANT TO A NON-QUALIFIED DEFERRED COMPENSATION PLAN. SHARES OF PHANTOM STOCK ARE PAYABLE IN CASH UPON DISTRIBUTION. JOHN E. KOERNER III 2019-02-11