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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating activities: |  |  |
Net income | $ 157,436 | $ 133,932 | $ 136,726
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Investment securities transactions, net | (4,774) | (2,626) | (3,682)
Impairment charges on available for sale securities |  | 354 | 954
Stock compensation expense | 903 | 1,082 | 1,172
(Decrease) increase in other liabilities | 592 | (7,705) | (6,567)
Net cash provided by operating activities | 196,819 | 203,220 | 203,649
Investing activities: |  |  |
Principal collected on mortgage-backed securities | 780,097 | 919,594 | 854,736
Net cash (used in) provided by investing activities | (403,807) | (137,763) | 373,225
Financing activities: |  |  |
Repayment of long-term debt |  | (1,000) | (14,000)
Proceeds from stock transactions | 1,455 | 549 | 1,370
Payments of cash dividends - common | (43,594) | (39,569) | (38,515)
Purchase of treasury stock | (187) | (7,966) | (6,678)
Net cash provided by (used in) financing activities | 203,147 | (69,312) | (558,967)
(Decrease) increase in cash and cash equivalents | (3,841) | (3,855) | 17,907
Cash and cash equivalents at beginning of period | 269,198 | 273,053 |
Cash and cash equivalents at end of period | 265,357 | 269,198 | 273,053
Parent Company |  |  |
Operating activities: |  |  |
Net income | 157,436 | 133,932 | 136,726
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Investment securities transactions, net | (23) |  |
Impairment charges on available for sale securities |  | 112 | 385
Stock compensation expense | 903 | 1,082 | 1,172
(Decrease) increase in other liabilities | (3,453) | 3,901 | (1,998)
Equity in undistributed net income of subsidiaries | (93,674) | (48,833) | (83,486)
Net cash provided by operating activities | 61,189 | 90,194 | 52,799
Investing activities: |  |  |
Principal collected on mortgage-backed securities | 6,328 | 1,105 | 474
Net decrease in notes receivable |  | 99 | 105
Increase in other assets and other investments | (25,348) | (27,834) | (1,830)
Net cash (used in) provided by investing activities | (19,020) | (26,630) | (1,251)
Financing activities: |  |  |
Repayment of long-term debt |  | (1,000) | (14,000)
Proceeds from stock transactions | 1,455 | 549 | 1,370
Payments of cash dividends - common | (43,594) | (39,569) | (38,515)
Purchase of treasury stock | (187) | (7,966) | (6,678)
Net cash provided by (used in) financing activities | (42,326) | (47,986) | (57,823)
(Decrease) increase in cash and cash equivalents | (157) | 15,578 | (6,275)
Cash and cash equivalents at beginning of period | 18,555 | 2,977 | 9,252
Cash and cash equivalents at end of period | $ 18,398 | $ 18,555 | $ 2,977

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details
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