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Equity Compensation and Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Employee Benefit and Share-based Payment Arrangement, Noncash Expense [Abstract] |
Schedule of Equity Compensation Expense and Related Income Tax Benefit Recognized | The following table summarizes the equity compensation expense and related income tax benefit recognized in the Consolidated Statements of Income (in thousands):
|  | Years Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Restricted awards: |  |  |  |  |  |
Pre-tax compensation expense |  | $ | 5,409 |  |  | $ | 4,943 |  |  | $ | 4,143 |
Tax benefit |  | 1,379 |  |  | 1,258 |  |  | 1,056 |
Restricted stock expense, net of tax |  | $ | 4,030 |  |  | $ | 3,685 |  |  | $ | 3,087 |
Performance awards: |  |  |  |  |  |
Pre-tax compensation expense |  | $ | 3,503 |  |  | $ | 3,156 |  |  | $ | 3,152 |
Tax benefit |  | 893 |  |  | 803 |  |  | 804 |
Performance award expense, net of tax |  | $ | 2,610 |  |  | $ | 2,353 |  |  | $ | 2,348 |
Schedule of Equity Compensation, Restricted Award Activity | The following table summarizes restricted award activity for the year ended December 31, 2020:
| Number of Restricted Awards (in thousands) |  | Weighted Average Grant Date Fair Value ($)
Nonvested at beginning of period | 369 |  |  | $ | 32.83 |
Granted | 181 |  |  | 38.73 |
Vested | (137) |  |  | 31.83 |
Forfeited | (46) |  |  | 35.43 |
Nonvested at end of period | 367 |  |  | 35.78 |
Schedule of Equity Compensation Performance Award Activity | The following table summarizes performance award activity for the year ended December 31, 2020:
| Number of Performance Awards (in thousands) |  | Weighted Average Grant Date Fair Value ($)
Nonvested at beginning of period | 327 |  |  | $ | 28.75 |
Granted | 133 |  |  | 32.96 |
Vested | (151) |  |  | 23.61 |
Forfeited | (47) |  |  | 32.95 |
Nonvested at end of period | 262 |  |  | 32.96 |
Contributions for Employee Stock Purchase Plan | Our contributions for the Purchase Plan were as follows (in thousands):
2020 | $ | 283 |
2019 | 265 |
2018 | 239 |
Contributions and Administrative Expenses Under 401(k) Retirement Savings Plan | Salaries, wages and benefits expense in the accompanying Consolidated Statements of Income includes our 401(k) Plan contributions and administrative expenses, which were as follows (in thousands):
2020 | $ | 4,748 |
2019 | 4,414 |
2018 | 2,615 |
Deferred Compensation Assets and Liabilities | The accumulated benefit obligation and aggregate market value of the life insurance policies were as follows (in thousands):
| December 31,
| 2020 |  | 2019
Accumulated benefit obligation | $ | 11,321 |  |  | $ | 9,588 |
Aggregate market value | 9,104 |  |  | 8,284 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + 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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- Definition Tabular disclosure of the number and weighted-average grant date fair value for outstanding performance shares. + 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 (c) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of company matching contributions to the employee stock purchase plan. + References No definition available. + Details
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