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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Operating activities: |  |  |
Net income | $ 136,726 | $ 153,151 | $ 126,351
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Impairment charges on available for sale securities | 954 | 817 | 1,374
Stock compensation expense | 1,172 | 1,058 | 414
(Decrease) increase in other liabilities | (6,567) | (7,482) | (2,274)
Net cash provided by operating activities | 203,649 | 193,037 | 209,126
Investing activities: |  |  |
Principal collected on mortgage-backed securities | 854,736 | 787,361 | 1,223,532
Net cash provided by (used in) investing activities | 373,225 | (90,399) | (447,649)
Financing activities: |  |  |
Proceeds from stock transactions | 1,370 | 555 | 265
Payments of cash dividends - common | (38,515) | (34,762) | (28,894)
Purchase of treasury stock | (6,678) | (18,923) |
Net cash (used in) provided by financing activities | (558,967) | (122,277) | 230,208
Increase (decrease) in cash and cash equivalents | 17,907 | (19,639) | (8,315)
Cash and cash equivalents at beginning of period | 255,146 | 274,785 | 283,100
Cash and cash equivalents at end of period | 273,053 | 255,146 | 274,785
Parent Company |  |  |
Operating activities: |  |  |
Net income | 136,726 | 153,151 | 126,351
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Impairment charges on available for sale securities | 385 | 254 | 754
Stock compensation expense | 1,172 | 1,058 | 414
(Decrease) increase in other liabilities | (1,998) | 416 | (969)
Equity in (undistributed) distributed net income of subsidiaries | (83,486) | (79,695) | (93,089)
Net cash provided by operating activities | 52,799 | 75,184 | 33,461
Investing activities: |  |  |
Principal collected on mortgage-backed securities | 474 | 1,301 | 1,207
Net decrease in notes receivable | 105 | 109 | 96
(Increase) decrease in other assets and other investments | (1,830) | (7,008) | 432
Net cash provided by (used in) investing activities | (1,251) | (5,598) | 1,735
Financing activities: |  |  |
Repayment of trust preferred securities | (14,000) | (15,310) |
Proceeds from stock transactions | 1,370 | 555 | 265
Payments of cash dividends - common | (38,515) | (34,762) | (28,894)
Purchase of treasury stock | (6,678) | (18,923) |
Net cash (used in) provided by financing activities | (57,823) | (68,440) | (28,629)
Increase (decrease) in cash and cash equivalents | (6,275) | 1,146 | 6,567
Cash and cash equivalents at beginning of period | 9,252 | 8,106 | 1,539
Cash and cash equivalents at end of period | $ 2,977 | $ 9,252 | $ 8,106

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