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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating activities:      
Net income $ 300,232 $ 253,922 $ 167,319
Adjustments to reconcile net income to net cash provided by operating activities:      
Provision for credit loss 21,651 7,955 45,379
Unrealized (gain) loss on equity securities with readily determinable fair values 721 123 (107)
Stock compensation expense 449 506 743
Increase (decrease) in other liabilities 42,018 (5,519) (13,932)
Net cash provided by operating activities 387,941 291,681 305,133
Investing activities:      
Net cash used in investing activities (992,028) (915,889) (343,705)
Financing activities:      
Proceeds from stock transactions 1,537 2,414 542
Payments of cash dividends - common (75,375) (72,838) (69,928)
Purchase of treasury stock (52,048) (716) (48,878)
Net cash (used in) provided by financing activities (517,431) 1,836,212 1,778,990
(Decrease) increase in cash and cash equivalents (1,121,518) 1,212,004 1,740,418
Cash and cash equivalents at beginning of period 3,209,242 1,997,238 256,820
Cash and cash equivalents at end of period 2,087,724 3,209,242 1,997,238
Parent Company | Reportable Legal Entities      
Operating activities:      
Net income 300,232 253,922 167,319
Adjustments to reconcile net income to net cash provided by operating activities:      
Provision for credit loss 437   27
Unrealized (gain) loss on equity securities with readily determinable fair values 36 (51) 22
Stock compensation expense 449 506 743
Increase (decrease) in other liabilities 1,743 (8,084) 2,467
Equity in undistributed net income of subsidiaries (74,413) (168,603) (41,641)
Net cash provided by operating activities 228,484 77,690 128,937
Investing activities:      
Net decrease (increase) in notes receivable (32,556) 1,549  
(Decrease) increase in other assets and other investments (43,343) (11,787) 31,289
Net cash used in investing activities (75,899) (10,238) 31,289
Financing activities:      
Proceeds from stock transactions 1,537 2,414 542
Payments of cash dividends - common (75,375) (72,838) (69,928)
Purchase of treasury stock (52,048) (716) (48,878)
Net cash (used in) provided by financing activities (125,886) (71,140) (118,264)
(Decrease) increase in cash and cash equivalents 26,699 (3,688) 41,962
Cash and cash equivalents at beginning of period 62,564 66,252 24,290
Cash and cash equivalents at end of period $ 89,263 $ 62,564 $ 66,252