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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating activities:      
Net income $ 167,319 $ 205,104 $ 215,931
Adjustments to reconcile net income to net cash provided by operating activities:      
Investment securities transactions, net 5 12 141
Provision for probable loan losses 45,379 18,843 6,112
Unrealized loss (gain) on equity securities with readily determinable fair values (107) (158) 388
Stock compensation expense 743 980 1,035
Increase (decrease) in other liabilities (13,932) 32,157 24,916
Net cash provided by operating activities 305,133 311,565 229,847
Investing activities:      
Net cash (used in) provided by investing activities (343,705) (318,058) 379,440
Financing activities:      
Redemption of long-term debt   (25,774)  
Proceeds from stock transactions 542 1,923 1,522
Payments of cash dividends - common (69,928) (68,670) (49,599)
Repurchase of outstanding common stock warrant     (29,005)
Purchase of treasury stock (48,878) (17,845) (19,042)
Net cash used in financing activities 1,778,990 (53,484) (557,847)
Increase (decrease) in cash and cash equivalents 1,740,418 (59,977) 51,440
Cash and cash equivalents at beginning of period 256,820 316,797 265,357
Cash and cash equivalents at end of period 1,997,238 256,820 316,797
Parent Company [Member] | Reportable Legal Entities      
Operating activities:      
Net income 167,319 205,104 215,931
Adjustments to reconcile net income to net cash provided by operating activities:      
Provision for probable loan losses 27    
Unrealized loss (gain) on equity securities with readily determinable fair values 22 (16) 330
Stock compensation expense 743 980 1,035
Increase (decrease) in other liabilities 2,467 (58) (1,479)
Equity in undistributed net income of subsidiaries (41,641) (84,234) (111,135)
Net cash provided by operating activities 128,937 121,776 104,682
Investing activities:      
Net increase in notes receivable   (12,100)  
(Decrease) increase in other assets and other investments 31,289 5,915 (7,891)
Net cash (used in) provided by investing activities 31,289 (6,185) (7,891)
Financing activities:      
Redemption of long-term debt   (25,774)  
Proceeds from stock transactions 542 1,923 1,522
Payments of cash dividends - common (69,928) (68,670) (49,599)
Repurchase of outstanding common stock warrant     (29,005)
Purchase of treasury stock (48,878) (17,845) (19,042)
Net cash used in financing activities (118,264) (110,366) (96,124)
Increase (decrease) in cash and cash equivalents 41,962 5,225 667
Cash and cash equivalents at beginning of period 24,290 19,065 18,398
Cash and cash equivalents at end of period $ 66,252 $ 24,290 $ 19,065