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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