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Equity Compensation and Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2021
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,
 202120202019
Restricted awards:
Pre-tax compensation expense$6,349 $5,409 $4,943 
Tax benefit1,587 1,379 1,258 
Restricted stock expense, net of tax$4,762 $4,030 $3,685 
Performance awards:
Pre-tax compensation expense$4,452 $3,503 $3,156 
Tax benefit1,113 893 803 
Performance award expense, net of tax$3,339 $2,610 $2,353 
Schedule of Equity Compensation, Restricted Award Activity The following table summarizes restricted award activity for the year ended December 31, 2021:
Number of
Restricted
Awards (in
thousands)		Weighted
Average Grant
Date Fair
Value ($)
Nonvested at beginning of period367 $35.78 
Granted160 42.69 
Vested(158)34.82 
Forfeited(13)36.88 
Nonvested at end of period356 39.27 
Schedule of Equity Compensation Performance Award Activity The following table summarizes performance award activity for the year ended December 31, 2021:
Number of
Performance Awards (in
thousands)		Weighted
Average Grant
Date Fair
Value ($)
Nonvested at beginning of period262 $32.96 
Granted77 38.48 
Vested(100)33.04 
Forfeited(10)32.88 
Nonvested at end of period229 34.77 
Contributions for Employee Stock Purchase Plan Our contributions for the Purchase Plan were as follows (in thousands):
2021$297 
2020283 
2019265 
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): 
2021$4,904 
20204,748 
20194,414 
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,
 20212020
Accumulated benefit obligation$12,755 $11,321 
Aggregate market value10,621 9,104