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Stock and Incentive Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2014
Stock and Incentive Compensation Plans [Abstract] |
Summary of stock and incentive plans' vesting periods and contractual terms [Table Text Block] | The following table summarizes the stock and incentive plans’ vesting periods and contractual terms in years:
|  | Vesting |  |  | Contractual |
|  | Period |  |  | Term |
Stock option awards - 1997 plan |  |  | 4 |  |  |  | 10 |
Stock option awards - 2005 plan |  |  | 5 |  |  |  | 7 |
Performance awards (includes achievement shares for grants after 2013) |  |  | 3 |  |  |  | - |
Achievement shares from performance grants prior to 2013 |  |  | 3 |  |  |  | - |
Time-vested awards |  |  | 3 |  |  |  | - |
Stock option activity | The following table summarizes Trustmark’s stock option activity for the years ended December 31, 2014, 2013 and 2012:
|  | 2014 |  |  | 2013 |  |  | 2012 |
Options |  | Shares |  |  | Average Option Price |  |  | Shares |  |  | Average Option Price |  |  | Shares |  |  | Average Option Price |
Outstanding, beginning of year |  |  | 105,450 |  |  | $ | 27.43 |  |  |  | 699,600 |  |  | $ | 27.58 |  |  |  | 1,205,100 |  |  | $ | 27.31 |
Exercised |  |  | - |  |  |  | - |  |  |  | (187,300 | ) |  |  | 26.96 |  |  |  | (11,125 | ) |  |  | 24.09 |
Expired |  |  | (105,450 | ) |  |  | 27.43 |  |  |  | (406,850 | ) |  |  | 27.90 |  |  |  | (494,375 | ) |  |  | 27.01 |
Outstanding, end of year |  |  | - |  |  |  | - |  |  |  | 105,450 |  |  | $ | 27.43 |  |  |  | 699,600 |  |  | $ | 27.58 |
Exercisable, end of year |  |  | - |  |  |  | - |  |  |  | 105,450 |  |  | $ | 27.43 |  |  |  | 699,600 |  |  | $ | 27.58 |
Restricted stock grants | The following table summarizes Trustmark’s performance award activity for the years ended December 31, 2014, 2013 and 2012:
|  | 2014 |  |  | 2013 |  |  | 2012 |
|  | Shares |  |  | Weighted- Average Grant-Date Fair Value |  |  | Shares |  |  | Weighted- Average Grant-Date Fair Value |  |  | Shares |  |  | Weighted- Average Grant-Date Fair Value |
Nonvested shares, beginning of year |  |  | 160,520 |  |  | $ | 25.20 |  |  |  | 159,583 |  |  | $ | 24.26 |  |  |  | 179,421 |  |  | $ | 20.30 |
Granted |  |  | 73,726 |  |  |  | 25.58 |  |  |  | 62,119 |  |  |  | 23.65 |  |  |  | 55,295 |  |  |  | 25.66 |
Released from restriction |  |  | (38,580 | ) |  |  | 25.40 |  |  |  | (54,784 | ) |  |  | 24.15 |  |  |  | (72,632 | ) |  |  | 21.38 |
Forfeited |  |  | (14,471 | ) |  |  | 24.86 |  |  |  | (6,398 | ) |  |  | 25.42 |  |  |  | (2,501 | ) |  |  | 24.70 |
Nonvested shares, end of year |  |  | 181,195 |  |  | $ | 24.98 |  |  |  | 160,520 |  |  | $ | 25.20 |  |  |  | 159,583 |  |  | $ | 24.26 |
The following table summarizes Trustmark’s time-vested award activity for the years ended December 31, 2014, 2013 and 2012:
|  | 2014 |  |  | 2013 |  |  | 2012 |
|  | Shares |  |  | Weighted- Average Grant-Date Fair Value |  |  | Shares |  |  | Weighted Average Grant-Date Fair Value |  |  | Shares |  |  | Weighted Average Grant-Date Fair Value |
Nonvested shares, beginning of year |  |  | 291,634 |  |  | $ | 24.48 |  |  |  | 317,573 |  |  | $ | 23.28 |  |  |  | 334,356 |  |  | $ | 21.04 |
Granted |  |  | 105,690 |  |  |  | 24.91 |  |  |  | 112,964 |  |  |  | 24.47 |  |  |  | 141,616 |  |  |  | 24.66 |
Released from restriction |  |  | (124,869 | ) |  |  | 24.74 |  |  |  | (122,727 | ) |  |  | 24.40 |  |  |  | (151,331 | ) |  |  | 23.14 |
Forfeited |  |  | (8,550 | ) |  |  | 24.77 |  |  |  | (16,176 | ) |  |  | 25.14 |  |  |  | (7,068 | ) |  |  | 24.14 |
Nonvested shares, end of year |  |  | 263,905 |  |  | $ | 24.66 |  |  |  | 291,634 |  |  | $ | 24.48 |  |  |  | 317,573 |  |  | $ | 23.28 |
Compensation expense for all stock and incentive plans | The following table presents information regarding compensation expense for all stock and incentive plans for the periods presented ($ in thousands):
|  | Recognized Compensation Expense for Years Ended December 31, |  |  | Unrecognized Compensation |  |  | Weighted Average Life of Unrecognized Compensation |
|  | 2014 |  |  | 2013 |  |  | 2012 |  |  | Expense |  |  | Expense |
Performance awards |  | $ | 1,065 |  |  | $ | 825 |  |  | $ | 868 |  |  | $ | 1,197 |  |  |  | 1.73 |
Time-vested awards |  |  | 3,087 |  |  |  | 2,774 |  |  |  | 3,105 |  |  |  | 3,619 |  |  |  | 1.76 |
Total |  | $ | 4,152 |  |  | $ | 3,599 |  |  | $ | 3,973 |  |  | $ | 4,816 |  |  |  |  |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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