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Capital Requirements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2018
Payments for repurchase of warrants		$ 29,005,000
Dividend payable by subsidiaries, maximum	$ 948,000,000

X

- Definition

Represents the maximum amount of dividend the subsidiary banks could pay to the entity.

+ References

No definition available.

+ Details

Name:	iboc_MaximumDividendIncomeToBeReceivedFromSubsidiaries
Namespace Prefix:	iboc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The aggregate amount paid by the entity to reacquire the right to purchase equity shares at a predetermined price, usually issued together with corporate debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

+ Details

Name:	us-gaap_PaymentsForRepurchaseOfWarrants
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration