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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, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Operating activities: |  |  |
Net income | $ 412,293 | $ 409,167 | $ 411,768
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Credit loss expense | 15,092 | 31,802 | 34,576
Unrealized (gain) loss on equity securities with readily determinable fair values | (180) | 24 | (59)
Increase in accrued interest receivable | (255) | (6,873) | (19,515)
Stock compensation expense | 104 | 214 | 330
Increase (decrease) in other liabilities | (4,258) | 41,015 | 10,757
Net cash provided by operating activities | 491,057 | 473,948 | 474,432
Investing activities: |  |  |
Net increase in loans | (664,746) | (812,477) | (632,976)
Net cash used in investing activities | (591,693) | (985,063) | (1,067,206)
Financing activities: |  |  |
Redemption of long-term debt |  |  | (25,774)
Proceeds from stock transactions | 1,466 | 3,758 | 1,167
Payments of cash dividends - common | (87,062) | (82,078) | (78,247)
Purchase of treasury stock | (4,608) | (963) | (4,611)
Net cash provided by (used in) financing activities | 284,471 | 212,709 | (843,892)
Increase (decrease) in cash and cash equivalents | 183,835 | (298,406) | (1,436,666)
Cash and cash equivalents at beginning of period | 352,652 | 651,058 | 2,087,724
Cash and cash equivalents at end of period | 536,487 | 352,652 | 651,058
Non-cash investing activities: |  |  |
Net transfers from loans to other investments |  | 25,551 |
Parent Company | Reportable legal entities |  |  |
Operating activities: |  |  |
Net income | 412,293 | 409,167 | 411,768
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Credit loss expense |  | 625 | 500
Unrealized (gain) loss on equity securities with readily determinable fair values | (11) | (27) | (14)
Increase in accrued interest receivable | (2,221) | (5,948) | (2,630)
Stock compensation expense | 104 | 214 | 330
Increase (decrease) in other liabilities | 12,664 | (1,251) | 4,911
Equity in undistributed net income of subsidiaries | (253,766) | (287,668) | (240,654)
Net cash provided by operating activities | 169,063 | 115,112 | 174,211
Investing activities: |  |  |
Net increase in loans | (25,703) | (24,528) | (20,170)
Increase in other assets and other investments | (46,732) | (50,627) | (30,655)
Net cash used in investing activities | (72,435) | (75,155) | (50,825)
Financing activities: |  |  |
Redemption of long-term debt |  |  | (25,774)
Proceeds from stock transactions | 1,466 | 3,758 | 1,167
Payments of cash dividends - common | (87,061) | (82,078) | (78,247)
Purchase of treasury stock | (4,606) | (963) | (4,611)
Net cash provided by (used in) financing activities | (90,201) | (79,283) | (107,465)
Increase (decrease) in cash and cash equivalents | 6,427 | (39,326) | 15,921
Cash and cash equivalents at beginning of period | 65,858 | 105,184 | 89,263
Cash and cash equivalents at end of period | $ 72,285 | 65,858 | $ 105,184
Non-cash investing activities: |  |  |
Net transfers from loans to other investments |  | $ 25,551 |

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- Definition The net cash outflow or inflow for the increase (decrease) in the beginning and end of period of loan and lease balances which are not originated or purchased specifically for resale. Includes cash payments and proceeds associated with (a) loans held-for-investment, (b) leases held-for-investment, and (c) both. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 230 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479024/942-230-45-1 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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- Definition The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(i)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479886/946-10-S99-3 + Details
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- Definition Amount of credit loss expense (reversal of expense) for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-22 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(11)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(i)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479886/946-10-S99-3 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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- Definition Value of investments transferred to the entity's investments in noncash transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-5 + Details
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