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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Cash Flows | 12 Months Ended
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Dec. 31, 2020
International Bancshares Corporation (Parent Company Only) Financial Information Statements of Cash Flows | (24) International Bancshares Corporation (Parent Company Only) Financial Information Statements of Cash Flows (Parent Company Only) Years ended December 31, 2020, 2019 and 2018 (Dollars in Thousands) ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018 |
Operating activities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income | ​ | $ | 167,319 | ​ | $ | 205,104 | ​ | $ | 215,931 | ​
Adjustments to reconcile net income to net cash provided by operating activities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Provision for credit loss | ​ | ​ | 27 | ​ | ​ | — | ​ | ​ | — | ​
Unrealized loss (gain) on equity securities with readily determinable fair values | ​ | ​ | 22 | ​ | ​ | (16) | ​ | ​ | 330 | ​
Stock compensation expense | ​ |  | 743 | ​ |  | 980 | ​ |  | 1,035 | ​
Increase (decrease) in other liabilities | ​ |  | 2,467 | ​ |  | (58) | ​ |  | (1,479) | ​
Equity in undistributed net income of subsidiaries | ​ |  | (41,641) | ​ |  | (84,234) | ​ |  | (111,135) | ​
Net cash provided by operating activities | ​ |  | 128,937 | ​ |  | 121,776 | ​ |  | 104,682 | ​
Investing activities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net increase in notes receivable | ​ |  | — | ​ |  | (12,100) | ​ |  | — | ​
(Decrease) increase in other assets and other investments | ​ |  | 31,289 | ​ |  | 5,915 | ​ |  | (7,891) | ​
Net cash provided by (used in) investing activities | ​ |  | 31,289 | ​ |  | (6,185) | ​ |  | (7,891) | ​
Financing activities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Redemption of long-term debt | ​ |  | — | ​ |  | (25,774) | ​ |  | — | ​
Proceeds from stock transactions | ​ |  | 542 | ​ |  | 1,923 | ​ |  | 1,522 | ​
Payments of cash dividends - common | ​ |  | (69,928) | ​ |  | (68,670) | ​ |  | (49,599) | ​
Repurchase of outstanding common stock warrant | ​ |  | — | ​ |  | — | ​ |  | (29,005) | ​
Purchase of treasury stock | ​ |  | (48,878) | ​ |  | (17,845) | ​ |  | (19,042) | ​
Net cash used in financing activities | ​ |  | (118,264) | ​ |  | (110,366) | ​ |  | (96,124) | ​
Increase in cash | ​ |  | 41,962 | ​ |  | 5,225 | ​ |  | 667 | ​
Cash at beginning of year | ​ |  | 24,290 | ​ |  | 19,065 | ​ |  | 18,398 | ​
Cash at end of year | ​ | $ | 66,252 | ​ | $ | 24,290 | ​ | $ | 19,065 | ​
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- Definition This element can be used to encapsulate the condensed financial information of Balance sheet disclosure of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented. Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document. + References No definition available. + Details
Name: | iboc_CondensedFinancialInformationOfCashFlowParentCompanyOnlyDisclosureTextBlock
Namespace Prefix: | iboc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration