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International Bancshares Corporation (Parent Company Only) Financial Information Statements of Cash Flows (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operating activities:      
Net income $ 127,149 $ 130,023 $ 142,742
Adjustments to reconcile net income to net cash provided by operating activities:      
Accretion of junior subordinated interest deferrable debentures 9 35 34
Investment securities transactions, net (17,285) (33,209) (11,956)
Accretion of investment securities discounts (2,081) (1,693) (1,940)
Stock compensation expense 387 534 655
(Decrease) increase in other liabilities (4,966) 1,652 (12,253)
Net cash provided by operating activities 181,896 178,155 182,709
Investing activities:      
Principal collected on mortgage-backed securities 999,419 1,085,817 1,224,938
Net cash provided by (used in) investing activities 206,060 (255,443) 638,210
Financing activities:      
Proceeds from stock transactions 113 484 2,705
Payments of cash dividends-common (25,648) (24,444) (23,262)
Payments of cash dividends-preferred (10,800) (10,800) (9,660)
Purchase of treasury stock (6,435) (6,949) (9,346)
Net cash (used in) provided by financing activities (323,885) 50,464 (895,001)
(Decrease) increase in cash 64,071 (26,824) (74,082)
Cash and cash equivalents at beginning of year 197,814 224,638 298,720
Cash and cash equivalents at end of year 261,885 197,814 224,638
Parent Company
      
Operating activities:      
Net income 127,149 130,023 142,742
Adjustments to reconcile net income to net cash provided by operating activities:      
Accretion of junior subordinated interest deferrable debentures 9 35 35
Investment securities transactions, net (2) 1,135 (6,586)
Accretion of investment securities discounts   (232) (325)
Stock compensation expense 387 534 655
(Decrease) increase in other liabilities (3,234) 4,976 (309)
Equity in undistributed net income of subsidiaries (78,806) (81,923) (96,414)
Net cash provided by operating activities 45,507 54,548 39,798
Investing activities:      
Contributions to subsidiaries     (138,103)
Principal collected on mortgage-backed securities 1,355 3,324 2,791
Net (increase) decrease in notes receivable (245) (150) 250
Increase in other assets (4,193) (8,311) (9,215)
Net cash provided by (used in) investing activities (3,083) (5,137) (144,277)
Financing activities:      
Repayment of trust preferred securities 10,400    
Proceeds from stock transactions 113 484 2,705
Payments of cash dividends-common (25,648) (24,444) (23,262)
Payments of cash dividends-preferred (10,800) (10,800) (9,660)
Purchase of treasury stock (6,435) (6,949) (9,346)
Net cash (used in) provided by financing activities (53,170) (41,709) (39,563)
(Decrease) increase in cash (10,746) 7,702 (144,042)
Cash and cash equivalents at beginning of year 24,414 16,712 160,754
Cash and cash equivalents at end of year $ 13,668 $ 24,414 $ 16,712