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Other Borrowed Funds (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Federal Home Loan Bank advances
Other borrowed funds	$ 808,376	$ 705,665
Percentage of decrease in other borrowed funds	14.60%

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- Definition

Represents the percentage change in other borrowed funds. Borrowed funds primarily consist of short and long term borrowings from the Federal Home Loan Bank.

+ References

No definition available.

+ Details

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Namespace Prefix:	iboc_
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Balance Type:	na
Period Type:	instant

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- Definition

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

+ Details

Name:	us-gaap_AdvancesFromFederalHomeLoanBanks
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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Period Type:	duration