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Commitments, Contingent Liabilities and Other Tax Matters (Details)	Dec. 31, 2019 USD ($)
Commitments and Contingent Liabilities and Other Matters, details
Approximate cash maintained to satisfy regulatory reserve requirements	$ 125,764,000

X

- Definition

Represents the amount of cash maintained to satisfy regulatory reserve requirements as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	iboc_CashReserveToSatisfyRegulatoryReserveRequirements
Namespace Prefix:	iboc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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