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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