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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Operating activities: |  |  |
Net Income (Loss) | $ 411,768 | $ 300,232 | $ 253,922
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Provision for credit loss | 34,576 | 21,651 | 7,955
Unrealized (gain) loss on equity securities with readily determinable fair values | (59) | 721 | 123
Stock compensation expense | 330 | 449 | 506
Increase (decrease) in other liabilities | 10,757 | 42,018 | (5,519)
Net cash provided by operating activities | 474,432 | 387,941 | 291,681
Investing activities: |  |  |
Net cash used in investing activities | (1,067,206) | (992,028) | (915,889)
Financing activities: |  |  |
Redemption of long-term debt | (25,774) |  |
Proceeds from stock transactions | 1,167 | 1,537 | 2,414
Payments of cash dividends - common | (78,247) | (75,375) | (72,838)
Purchase of treasury stock | (4,611) | (52,048) | (716)
Net cash (used in) provided by financing activities | (843,892) | (517,431) | 1,836,212
(Decrease) increase in cash and cash equivalents | (1,436,666) | (1,121,518) | 1,212,004
Cash and cash equivalents at beginning of period | 2,087,724 | 3,209,242 | 1,997,238
Cash and cash equivalents at end of period | 651,058 | 2,087,724 | 3,209,242
Parent Company | Reportable Legal Entities |  |  |
Operating activities: |  |  |
Net Income (Loss) | 411,768 | 300,232 | 253,922
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Provision for credit loss | 500 | 437 |
Unrealized (gain) loss on equity securities with readily determinable fair values | (14) | 36 | (51)
Stock compensation expense | 330 | 449 | 506
Increase (decrease) in other liabilities | 4,911 | 1,743 | (8,084)
Equity in undistributed net income of subsidiaries | (240,654) | (74,413) | (168,603)
Net cash provided by operating activities | 176,841 | 228,484 | 77,690
Investing activities: |  |  |
Net decrease (increase) in notes receivable | (20,170) | (32,556) | 1,549
Increase in other assets and other investments | (33,285) | (43,343) | (11,787)
Net cash used in investing activities | (53,455) | (75,899) | (10,238)
Financing activities: |  |  |
Redemption of long-term debt | (25,774) |  |
Proceeds from stock transactions | 1,167 | 1,537 | 2,414
Payments of cash dividends - common | (78,247) | (75,375) | (72,838)
Purchase of treasury stock | (4,611) | (52,048) | (716)
Net cash (used in) provided by financing activities | (107,465) | (125,886) | (71,140)
(Decrease) increase in cash and cash equivalents | 15,921 | 26,699 | (3,688)
Cash and cash equivalents at beginning of period | 89,263 | 62,564 | 66,252
Cash and cash equivalents at end of period | $ 105,184 | $ 89,263 | $ 62,564

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