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Share-Based Payment Arrangements | 12 Months Ended
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Dec. 31, 2017
Share-Based Payment Arrangements [Abstract] |
Share-Based Payment Arrangements | Note 17. Share-Based Payment Arrangements ﻿ The Company maintains incentive compensation plans that incorporate share-based payment arrangements for associates and directors. The current plan under which share-based awards may be granted, the 2014 Long Term Incentive Plan (the “2014 Plan”), was approved by the Company’s stockholders at the 2014 annual meeting as a successor to the Company’s 2005 Long-Term Incentive Plan (the “2005 Plan”). Certain share-based awards remain outstanding under the 2005 Plan and prior equity incentive compensation plans, but no future awards may be granted thereunder. ﻿ The Compensation Committee of the Company’s Board of Directors administers the equity incentive plans, makes determinations with respect to participation by employees or directors and authorizes the share-based awards. Under the 2014 Plan, participants may be awarded stock options (including incentive stock options for associates), restricted shares, performance stock awards and stock appreciation rights, all on a stand-alone, combination or tandem basis. To date, the Committee has awarded stock options, tenure-based restricted shares and performance stock awards under the 2014 Plan and the prior equity incentive plans. ﻿ During the year ended December 31, 2017, the Company’s shareholders approved a 1,200,000 increase in the aggregate number of awards that may be granted under the 2014 Plan. F uture awards may be granted for the issuance of an aggregate of 2,996,357 shares of the Company’s common stock, plus the number of any shares of the Company’s common stock for which awards under the 2005 Plan are cancelled, expired, forfeited or settled in cash. The 2014 Plan limits the number of shares for which awards may be granted to any participant during any calendar year to 100,000 shares. The Company may use authorized unissued shares or shares held in treasury to satisfy awards under the 2014 Plan. ﻿ As of December 31, 2017 there were 1.6 million shares available for future issuance under the 2014 equity compensation plan. ﻿ For the years ended December 31, 2017, 2016 and 2015 total share-based compensation recognized in income was $1 7.6 million, $1 4.3 million and $1 2.9 million, respectively. The total recognized tax benefit related to the share-based compensation was $13.3 million, $5.2 million and $4.8 million for 2017, 2016 and 2015, respectively. ﻿ A summary of option activity for 2017 is presented below: ﻿ ﻿
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﻿ |  |  |  |  |  |  |  |  |  |
﻿Options |  | Number of Shares |  | Weighted- Average Exercise Price ($) |  | Weighted- Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value ($000)
﻿Outstanding at January 1, 2017 |  | 456,258 |  | $ | 35.91 |  | 3.5 |  | $ | 3,734
﻿Exercised |  | (350,744) |  |  | 34.65 |  |  |  |  | 4,304
﻿Cancelled/Forfeited |  | (538) |  |  | 32.09 |  |  |  |  | 6
﻿Expired |  | (16,675) |  |  | 68.18 |  |  |  |  | —
﻿Outstanding at December 31, 2017 |  | 88,301 |  | $ | 34.84 |  | 2.8 |  | $ | 1,294
﻿Exercisable at December 31, 2017 |  | 88,301 |  | $ | 34.84 |  | 2.8 |  | $ | 1,294
﻿ The number of shares subject to the outstanding options reflected above includes shares to be issued upon the exercise of options that were assumed by the Company in the acquisition of Whitney Holding Corporation. ﻿ The exercise price for stock options is set at the closing market price of the Company’s stock on the date immediately preceding the date of grant, except for the exercise price of certain options granted to major stockholders which is set at 110% of the market price. Option awards generally vest equally over five years of continuous service and have ten-year contractual terms. ﻿ The total intrinsic value of options exercised during 2017 was $4.3 million. The total intrinsic value of options exercised during 2016 and 2015 was $0.5 million, and $0.02 million, respectively. ﻿ A summary of the Company’s nonvested restricted and performance shares for the year ended December 31, 2017 is presented below: ﻿
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﻿ |  |  |  |  |
﻿ |  | Number of Shares |  | Weighted- Average Grant-Date Fair Value ($)
﻿Nonvested at January 1, 2017 |  | 2,152,119 |  | $ | 32.12
﻿Granted |  | 525,258 |  |  | 45.71
﻿Vested |  | (906,944) |  |  | 30.66
﻿Cancelled/Forfeited |  | (61,491) |  |  | 32.57
﻿Nonvested at December 31, 2017 |  | 1,708,942 |  | $ | 37.05
﻿ As of December 31, 2017, there was $50.6 million of total unrecognized compensation expense related to nonvested restricted and performance shares expected to vest. This compensation is expected to be recognized in expense over a weighted-average period of 3.5 years. The total fair value of shares which vested during 2017 and 2016 was $26.3 million and $1 1.5 million, respectively. ﻿ In 2017, the Company granted 23,489 performance shares subject to a total shareholder return (“TSR”) performance metric with a grant date fair value of $42.92 per share and 23,489 performance shares subject to a core earnings per share performance metric with a grant date fair value of $38.26 per share to key members of executive management. The number of performance shares subject to TSR that ultimately vest at the end of the three-year performance period, if any, will be based on the relative rank of the Company’s three-year TSR among the TSRs of a peer group of 43 regional banks. The fair value of the performance shares subject to TSR at the grant date was determined using a Monte Carlo simulated method. The number of performance shares subject to core earnings per share that ultimately vest will be based on the Company’s attainment of certain core earnings per share goals over the two-year performance period. The maximum number of performance shares that could vest is 200% of the target award. Compensation expense for these performance shares will be recognized on a straight-line basis over the three-year service period.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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