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Share-based Payments (Tables) | 12 Months Ended
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Dec. 31, 2017
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Summary of Details of Share-Based Payments | Details of share-based payments as of December 31, 2017, are as follows:
|  | 11th
Grant date |  | July 27, 2017
Grantee |  | CEO, inside directors, outside directors, executives
Vesting conditions |  | Service condition: 1 year Non-market performance condition: achievement of performance
Fair value per option (in Korean won) |  | ￦34,400
Total compensation costs (in Korean won) |  | ￦6,483 million
Estimated exercise date (exercise date) |  | After July 27, 2018
Valuation method |  | Fair value method
Summary of Changes in the Number of Stock Options and the Weighted-Average Exercise Price | Changes in the number of stock options and the weighted-average exercise price as of December 31, 2016 and 2017, are as follows:
|  | 2016 |
|  | Beginning |  |  | Granted |  |  | Expired |  |  | Forfeited |  |  | Exercised1 |  |  | Ending |  |  | Number of shares exercisable |
9th grant |  | ￦ | 263,123 |  |  | ￦ | 54,913 |  |  | ￦ | 181,685 |  |  | ￦ | — |  |  | ￦ | 136,351 |  |  | ￦ | — |  |  | ￦ | — |
10th grant |  |  | — |  |  |  | 318,506 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 318,506 |  |  |  | — |
Total |  | ￦ | 263,123 |  |  | ￦ | 373,419 |  |  | ￦ | 181,685 |  |  | ￦ | — |  |  | ￦ | 136,351 |  |  | ￦ | 318,506 |  |  | ￦ | — |
|  | 2017 |
|  | Beginning |  |  | Granted |  |  | Expired |  |  | Forfeited |  |  | Exercised1 |  |  | Ending |  |  | Number of shares exercisable |
10th grant |  | ￦ | 318,506 |  |  | ￦ | — |  |  | ￦ | 193,094 |  |  | ￦ | — |  |  | ￦ | 125,412 |  |  | ￦ | — |  |  | ￦ | — |
11th grant |  |  | — |  |  |  | 316,949 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 316,949 |  |  |  | — |
Total |  | ￦ | 318,506 |  |  | ￦ | 316,949 |  |  | ￦ | 193,094 |  |  | ￦ | — |  |  | ￦ | 125,412 |  |  | ￦ | 316,949 |  |  | ￦ | — |
| 1 | The weighted average price of ordinary shares at the time of exercise during 2017 was ￦31,797 (2016: ￦31,750).

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