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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating activities: |  |  |
Net income | $ 133,932 | $ 136,726 | $ 153,151
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Impairment charges on available for sale securities | 354 | 954 | 817
Stock compensation expense | 1,082 | 1,172 | 1,058
Increase (decrease) in other liabilities | (7,705) | (6,567) | (7,482)
Net cash provided by operating activities | 203,220 | 203,649 | 193,037
Investing activities: |  |  |
Principal collected on mortgage-backed securities | 919,594 | 854,736 | 787,361
Net cash (used in) provided by investing activities | (137,763) | 373,225 | (90,399)
Financing activities: |  |  |
Repayments of Long-term Debt | 1,000 | 14,000 | 15,310
Proceeds from stock transactions | 549 | 1,370 | 555
Payments of cash dividends - common | (39,569) | (38,515) | (34,762)
Purchase of treasury stock | (7,966) | (6,678) | (18,923)
Net cash used in financing activities | (69,312) | (558,967) | (122,277)
(Decrease) increase in cash and cash equivalents | (3,855) | 17,907 | (19,639)
Cash and cash equivalents at beginning of period | 273,053 | 255,146 | 274,785
Cash and cash equivalents at end of period | 269,198 | 273,053 | 255,146
Parent Company |  |  |
Operating activities: |  |  |
Net income | 133,932 | 136,726 | 153,151
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Impairment charges on available for sale securities | 112 | 385 | 254
Stock compensation expense | 1,082 | 1,172 | 1,058
Increase (decrease) in other liabilities | 3,901 | (1,998) | 416
Equity in undistributed net income of subsidiaries | (48,833) | (83,486) | (79,695)
Net cash provided by operating activities | 90,194 | 52,799 | 75,184
Investing activities: |  |  |
Principal collected on mortgage-backed securities | 1,105 | 474 | 1,301
Net decrease in notes receivable | 99 | 105 | 109
Increase in other assets and other investments | (27,834) | (1,830) | (7,008)
Net cash (used in) provided by investing activities | (26,630) | (1,251) | (5,598)
Financing activities: |  |  |
Repayments of Long-term Debt | 1,000 | 14,000 | 15,310
Proceeds from stock transactions | 549 | 1,370 | 555
Payments of cash dividends - common | (39,569) | (38,515) | (34,762)
Purchase of treasury stock | (7,966) | (6,678) | (18,923)
Net cash used in financing activities | (47,986) | (57,823) | (68,440)
(Decrease) increase in cash and cash equivalents | 15,578 | (6,275) | 1,146
Cash and cash equivalents at beginning of period | 2,977 | 9,252 | 8,106
Cash and cash equivalents at end of period | $ 18,555 | $ 2,977 | $ 9,252

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