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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Cash Flows (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Sep. 19, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating activities: |  |  |  |
Net income |  | $ 205,104,000 | $ 215,931,000 | $ 157,436,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Investment securities transactions, net |  | 12,000 | 141,000 | 4,774,000
Unrealized (gain) loss on equity securities with readily determinable fair values |  | (158,000) | 388,000 |
Stock compensation expense |  | 980,000 | 1,035,000 | 903,000
Decrease in other liabilities |  | 32,157,000 | 24,916,000 | 592,000
Net cash provided by operating activities |  | 311,565,000 | 229,847,000 | 196,819,000
Investing activities: |  |  |  |
Net cash (used in) provided by investing activities |  | (318,058,000) | 379,440,000 | (403,807,000)
Financing activities: |  |  |  |
Redemption of long-term debt |  | (25,774,000) |  |
Proceeds from stock transactions |  | 1,923,000 | 1,522,000 | 1,455,000
Payments of cash dividends - common |  | (68,670,000) | (49,599,000) | (43,594,000)
Repurchase of outstanding common stock warrant | $ (29,005,000) |  | (29,005,000) |
Purchase of treasury stock |  | (17,845,000) | (19,042,000) | (187,000)
Net cash (used in) provided by financing activities |  | (53,484,000) | (557,847,000) | 203,147,000
(Decrease) increase in cash and cash equivalents |  | (59,977,000) | 51,440,000 | (3,841,000)
Cash and cash equivalents at beginning of period |  | 316,797,000 | 265,357,000 | 269,198,000
Cash and cash equivalents at end of period |  | 256,820,000 | 316,797,000 | 265,357,000
Parent Company | Reportable Legal Entities |  |  |  |
Operating activities: |  |  |  |
Net income |  | 205,104,000 | 215,931,000 | 157,436,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Investment securities transactions, net |  |  |  | (23,000)
Unrealized (gain) loss on equity securities with readily determinable fair values |  | (16,000) | 330,000 |
Stock compensation expense |  | 980,000 | 1,035,000 | 903,000
Decrease in other liabilities |  | (58,000) | (1,479,000) | (3,453,000)
Equity in undistributed net income of subsidiaries |  | (84,234,000) | (111,135,000) | (93,674,000)
Net cash provided by operating activities |  | 121,776,000 | 104,682,000 | 61,189,000
Investing activities: |  |  |  |
Principal collected on mortgage-backed securities |  |  |  | 6,328,000
Net increase in notes receivable |  | (12,100,000) |  |
(Decrease) increase in other assets and other investments |  | 5,915,000 | (7,891,000) | (25,348,000)
Net cash (used in) provided by investing activities |  | (6,185,000) | (7,891,000) | (19,020,000)
Financing activities: |  |  |  |
Redemption of long-term debt |  | (25,774,000) |  |
Proceeds from stock transactions |  | 1,923,000 | 1,522,000 | 1,455,000
Payments of cash dividends - common |  | (68,670,000) | (49,599,000) | (43,594,000)
Repurchase of outstanding common stock warrant |  |  | (29,005,000) |
Purchase of treasury stock |  | (17,845,000) | (19,042,000) | (187,000)
Net cash (used in) provided by financing activities |  | (110,366,000) | (96,124,000) | (42,326,000)
(Decrease) increase in cash and cash equivalents |  | 5,225,000 | 667,000 | (157,000)
Cash and cash equivalents at beginning of period |  | 19,065,000 | 18,398,000 | 18,555,000
Cash and cash equivalents at end of period |  | $ 24,290,000 | $ 19,065,000 | $ 18,398,000

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