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Loan Servicing (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Loan Servicing [Abstract]
Unpaid principal balances of loans serviced	$ 198,860,000	$ 170,505,000

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- Definition

Unpaid principal balances of loans serviced.

+ References

No definition available.

+ Details

Name:	ibkc_UnpaidPrincipalBalancesOfLoansServiced
Namespace Prefix:	ibkc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

Name:	us-gaap_TransfersAndServicingAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration