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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

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