Basis Of Presentation (Detail)	Jun. 30, 2012 State
Iberiabank Corp [Member]
Number of states in which entity operates	6
Iberiabank Mortgage Company [Member]
Number of states in which entity operates	12

The number of states the entity operates in as of the balance sheet date.

No definition available.

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant