Shareholders' Equity, Capital Ratios and Other Regulatory Matters (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended
	May 09, 2016	May 04, 2016	Sep. 30, 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)			0	202,506
Average cost of shares repurchased (in dollars per share)				$ 57.61
Consolidated
Class of Stock
Capital conversion buffer (percent)			4.49%
IBERIABANK
Class of Stock
Capital conversion buffer (percent)			3.44%
Depository Shares [Member]
Class of Stock
Shares issued	2,300,000
Liquidation preference equivalent (in usd per share)	$ 25
Liquidation preference	$ 57,500
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%