XML 38 R22.htm IDEA: XBRL DOCUMENT
v3.20.4

International Operations | 12 Months Ended
--- | ---
Dec. 31, 2020
International Operations | (13) International Operations We provide international banking services for our customers through our Subsidiary Banks. Neither we nor our Subsidiary Banks have facilities located outside the United States. International operations are distinguished from domestic operations based upon the domicile of the customer. Because the resources we employ are common to both international and domestic operations, it is not practical to determine net income generated exclusively from international activities. A summary of assets attributable to international operations at December 31, 2020 and 2019 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​ | 2019 |
​ | ​ | (Dollars in Thousands) |
Loans: |  | ​ |  |  | ​ |  | ​
Commercial | ​ | $ | 90,177 | ​ | $ | 88,979 | ​
Others | ​ |  | 48,793 | ​ |  | 52,070 | ​
​ | ​ |  | 138,970 | ​ |  | 141,049 | ​
Less allowance for probable loan losses | ​ |  | (753) | ​ |  | (823) | ​
Net loans | ​ | $ | 138,217 | ​ | $ | 140,226 | ​
Accrued interest receivable | ​ | $ | 605 | ​ | $ | 743 | ​
​ At December 31, 2020, we had $118,722,000 in outstanding standby and commercial letters of credit to facilitate trade activities. Revenues directly attributable to international operations were approximately $4,676,000, $5,445,000 and $5,412,000 for the years ended December 31, 2020, 2019 and 2018, respectively.

X
- Definition Disclosure of the international banking services of the entity based on the domicile of the customer. + References No definition available. + Details
Name: | iboc_InternationalOperationsDisclosureTextBlock
Namespace Prefix: | iboc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration