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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Operating activities: |  |  |
Net Income (Loss) | $ 409,167 | $ 411,768 | $ 300,232
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Provision for credit loss | 31,802 | 34,576 | 21,651
Unrealized (gain) loss on equity securities with readily determinable fair values | 24 | (59) | 721
Stock compensation expense | 214 | 330 | 449
(Decrease) increase in other liabilities | 41,015 | 10,757 | 42,018
Net cash provided by operating activities | 473,948 | 474,432 | 387,941
Investing activities: |  |  |
Net increase in loans | (812,477) | (632,976) | (228,340)
Net cash used in investing activities | (985,063) | (1,067,206) | (992,028)
Financing activities: |  |  |
Redemption of long-term debt |  | (25,774) |
Proceeds from stock transactions | 3,758 | 1,167 | 1,537
Payments of cash dividends - common | (82,078) | (78,247) | (75,375)
Purchase of treasury stock | (963) | (4,611) | (52,048)
Net cash provided by (used in) financing activities | 212,709 | (843,892) | (517,431)
Decrease in cash and cash equivalents | (298,406) | (1,436,666) | (1,121,518)
Cash and cash equivalents at beginning of period | 651,058 | 2,087,724 | 3,209,242
Cash and cash equivalents at end of period | 352,652 | 651,058 | 2,087,724
Non-cash investing activities: |  |  |
Net transfers from loans to other investments | 25,551 |  |
Parent Company | Reportable legal entities |  |  |
Operating activities: |  |  |
Net Income (Loss) | 409,167 | 411,768 | 300,232
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Provision for credit loss | 625 | 500 | 437
Unrealized (gain) loss on equity securities with readily determinable fair values | (27) | (14) | 36
Stock compensation expense | 214 | 330 | 449
(Decrease) increase in other liabilities | (1,251) | 4,911 | 1,743
Equity in undistributed net income of subsidiaries | (287,668) | (240,654) | (74,413)
Net cash provided by operating activities | 121,060 | 176,841 | 228,484
Investing activities: |  |  |
Net increase in loans | (24,528) | (20,170) | (32,556)
Increase in other assets and other investments | (56,575) | (33,285) | (43,343)
Net cash used in investing activities | (81,103) | (53,455) | (75,899)
Financing activities: |  |  |
Redemption of long-term debt |  | (25,774) |
Proceeds from stock transactions | 3,758 | 1,167 | 1,537
Payments of cash dividends - common | (82,078) | (78,247) | (75,375)
Purchase of treasury stock | (963) | (4,611) | (52,048)
Net cash provided by (used in) financing activities | (79,283) | (107,465) | (125,886)
Decrease in cash and cash equivalents | (39,326) | 15,921 | 26,699
Cash and cash equivalents at beginning of period | 105,184 | 89,263 | 62,564
Cash and cash equivalents at end of period | 65,858 | $ 105,184 | $ 89,263
Non-cash investing activities: |  |  |
Net transfers from loans to other investments | $ 25,551 |  |

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