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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating activities: |  |  |
Net income | $ 253,922 | $ 167,319 | $ 205,104
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Provision for credit loss | 7,955 | 45,379 | 18,843
Unrealized (gain) loss on equity securities with readily determinable fair values | 123 | (107) | (158)
Stock compensation expense | 506 | 743 | 980
(Decrease) increase in other liabilities | (5,519) | (13,932) | 32,157
Net cash provided by operating activities | 291,681 | 305,133 | 311,565
Investing activities: |  |  |
Net cash used in investing activities | (915,889) | (343,705) | (318,058)
Financing activities: |  |  |
Redemption of long-term debt |  |  | (25,774)
Proceeds from stock transactions | 2,414 | 542 | 1,923
Payments of cash dividends - common | (72,838) | (69,928) | (68,670)
Purchase of treasury stock | (716) | (48,878) | (17,845)
Net cash provided by (used in) financing activities | 1,836,212 | 1,778,990 | (53,484)
Increase (decrease) in cash and cash equivalents | 1,212,004 | 1,740,418 | (59,977)
Cash and cash equivalents at beginning of period | 1,997,238 | 256,820 | 316,797
Cash and cash equivalents at end of period | 3,209,242 | 1,997,238 | 256,820
Parent Company | Reportable Legal Entities |  |  |
Operating activities: |  |  |
Net income | 253,922 | 167,319 | 205,104
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Provision for credit loss |  | 27 |
Unrealized (gain) loss on equity securities with readily determinable fair values | (51) | 22 | (16)
Stock compensation expense | 506 | 743 | 980
(Decrease) increase in other liabilities | (8,084) | 2,467 | (58)
Equity in undistributed net income of subsidiaries | (168,603) | (41,641) | (84,234)
Net cash provided by operating activities | 77,690 | 128,937 | 121,776
Investing activities: |  |  |
Net decrease (increase) in notes receivable | 1,549 |  | (12,100)
(Decrease) increase in other assets and other investments | (11,787) | 31,289 | 5,915
Net cash used in investing activities | (10,238) | 31,289 | (6,185)
Financing activities: |  |  |
Redemption of long-term debt |  |  | (25,774)
Proceeds from stock transactions | 2,414 | 542 | 1,923
Payments of cash dividends - common | (72,838) | (69,928) | (68,670)
Purchase of treasury stock | (716) | (48,878) | (17,845)
Net cash provided by (used in) financing activities | (71,140) | (118,264) | (110,366)
Increase (decrease) in cash and cash equivalents | (3,688) | 41,962 | 5,225
Cash and cash equivalents at beginning of period | 66,252 | 24,290 | 19,065
Cash and cash equivalents at end of period | $ 62,564 | $ 66,252 | $ 24,290

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