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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
Fair value assumptions of stock options | The following assumptions were used in estimating the fair value for options granted in the first six months of 2018 and full year 2017.
| 2018 |  | 2017
Dividend yield | 2.50 | % |  | 2.00 | %
Risk-free interest rate | 2.60 | % |  | 2.00 | %
Weighted average expected volatility | 22.00 | % |  | 25.00 | %
Weighted average expected life | 5.75 years |  |  | 5.5 years |
Weighted average per share fair value of options | $4.47 |  | $5.30
Summary of Company's Stock Option Activities | A summary of the Corporation’s stock option activity for the six months ended June 30, 2018 is presented below.
Stock Options | Shares | Weighted Average Exercise Price | Weighted Average Remaining Contractual Term | Aggregate Intrinsic Value(a)
Outstanding at December 31, 2017 | 5,118,687 |  | $ | 18.02 |  | 6.48 | $ | 38,028 |
Granted | 938,740 |  | 24.50 |  |  |
Assumed from Bank Mutual acquisition | 370,051 |  | 14.35 |  |  |
Exercised | (888,661 | ) | 16.69 |  |  |
Forfeited or expired | (38,613 | ) | 24.21 |  |  |
Outstanding at June 30, 2018 | 5,500,204 |  | $ | 19.05 |  | 6.69 | $ | 45,418 |
Options Exercisable at June 30, 2018 | 3,287,488 |  | $ | 16.80 |  | 5.39 | $ | 34,551 |
Summary of Restricted Stock Awards Activity (Excluding Salary Shares) | The following table summarizes information about the Corporation’s restricted stock activity for the six months ended June 30, 2018.
Restricted Stock | Shares |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2017 | 2,026,071 |  |  | $ | 19.68 |
Granted | 573,877 |  |  | 24.65 |
Vested | (537,881 | ) |  | 18.21 |
Forfeited | (30,480 | ) |  | 22.16 |
Outstanding at June 30, 2018 | 2,031,587 |  |  | $ | 21.87 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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