Shareholders' Equity, Capital Ratios and Other Regulatory Matters (Details) - USD ($)	May 09, 2016	May 04, 2016	Jun. 30, 2016	Dec. 31, 2015
Class of Stock
Percent of trust based securities excluded from tier one risk based capital			100.00%
Preferred stock, par value (in usd per share)			$ 1	$ 1
Liquidation preference (in usd per share)			$ 10,000	$ 10,000
Number of shares authorized for repurchase		950,000
Period of share repurchase program		2 years
Shares repurchases (in shares)		202,506
Average cost of shares repurchased (in dollars per share)		$ 57.61
Consolidated
Class of Stock
Capital conversion buffer (percent)			4.46%
IBERIABANK
Class of Stock
Capital conversion buffer (percent)			3.33%
Depository Shares [Member]
Class of Stock
Shares issued	2,300,000
Liquidation preference equivalent (in usd per share)	$ 25
Liquidation preference	$ 57,500,000
Series C Preferred Stock [Member]
Class of Stock
Dividend rate (percentage)	6.60%
Preferred stock, par value (in usd per share)	$ 1.00
Liquidation preference (in usd per share)	$ 10,000
LIBOR | Series C Preferred Stock [Member]
Class of Stock
Variable dividend rate beginning on May 1, 2026	492.00%