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Stock Options and Stock Appreciation Rights | 3 Months Ended
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Mar. 31, 2023
Stock Options and Stock Appreciation Rights |
Stock Options | Note 5 — Stock Options ​ On April 5, 2012, the Board of Directors adopted the 2012 International Bancshares Corporation Stock Option Plan (the “2012 Plan”). There were 800,000 shares of common stock available for stock option grants under the 2012 Plan, which were qualified incentive stock options (“ISOs”) or non-qualified stock options. Options granted may be exercisable for a period of up to 10 years from the date of grant, excluding ISOs granted to 10% shareholders, which may be exercisable for a period of up to only five years. On April 4, 2022 the 2012 plan expired and was not renewed. ​ A summary of option activity under the stock option plan for the three months ended March 31, 2023 is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted |  |  | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | average | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | average | ​ | remaining | ​ | Aggregate | ​
​ | ​ | Number of | ​ | exercise | ​ | contractual | ​ | intrinsic | ​
​ | ​ | options | ​ | price | ​ | term (years) | ​ | value ($) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | (in Thousands) | ​
Options outstanding at December 31, 2022 |  | 461,822 | ​ | $ | 29.67 | ​ | ​ | ​ | ​ | ​ | ​
Plus: Options granted |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ | ​
Less: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options exercised |  | 3,537 | ​ |  | 24.00 | ​ | ​ | ​ | ​ | ​ | ​
Options expired |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ | ​
Options forfeited |  | 2,938 | ​ |  | 36.51 | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding at March 31, 2023 |  | 455,347 | ​ |  | 29.67 |  | 3.82 | ​ | $ | 5,987 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options fully vested and exercisable at March 31, 2023 |  | 257,932 | ​ | $ | 25.20 |  | 2.06 | ​ | $ | 4,545 | ​
​ Stock-based compensation expense included in the consolidated statements of income for the three months ended March 31, 2023 and March 31, 2022 was $102,000 and $121,000, respectively. As of March 31, 2023, there was approximately $660,000 of total unrecognized stock-based compensation cost related to non-vested options granted under our plans that will be recognized over a weighted average period of 1.6 years. ​ On April 18, 2022, the Board of Directors adopted the 2022 International Bancshares Corporation Stock Appreciation Rights Plan (the “SAR Plan”). There are 750,000 shares of underlying common stock that may be used for stock appreciation right (“SAR”) grants under the plan, however, no actual shares will be granted. Upon exercise, the SAR will be settled in cash. SARs granted may be exercisable for a period of up to 10 years from the date of grant and may vest over an eight-year period. As of March 31, 2023, a total of 502,250 SARs had been issued under the SAR Plan. A summary of activity under the SAR Plan for the three months ended March 31, 2023 is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted |  |  | ​
​ | ​ | ​ | ​ | Weighted | ​ | average | ​ | ​ | ​
​ | ​ | Number of | ​ | average | ​ | remaining | ​ | Aggregate
​ | ​ | stock appreciation | ​ | exercise | ​ | contractual | ​ | intrinsic
​ | ​ | rights | ​ | price | ​ | term (years) | ​ | value ($)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | (in Thousands)
Stock appreciation rights outstanding at December 31, 2022 |  | 489,250 | ​ | $ | 39.35 | ​ | ​ | ​ | ​ | ​
Plus: Stock appreciation rights granted |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Less: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock appreciation rights exercised |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​
Stock appreciation rights expired |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​
Stock appreciation rights forfeited |  | 5,750 | ​ | ​ | 39.33 | ​ | ​ | ​ | ​ | ​
Stock appreciation rights outstanding at March 31, 2023 |  | 483,500 | ​ |  | 39.35 |  | 9.50 | ​ | $ | 1,680
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock appreciation rights fully vested and exercisable at March 31, 2023 |  | — | ​ | $ | — |  | ​ | ​ | ​ | ​
​ The fair value of the liability for payments due to stock appreciation rights holders at March 31, 2023 is approximately $712,000, as calculated using a Black-Sholes Merton model, and is included in other liabilities on the consolidated statements of condition. The expense recorded in connection with all grants under the SAR Plan totaled $166,000 for the three months ended March 31, 2023.

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