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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

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