Stock-Based Compensation - Stock Options, Stock Awards, and Stock in Lieu of Directors' Fees (Details)
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1 Months Ended |
12 Months Ended |
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Jan. 31, 2022
shares
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Jan. 31, 2021
shares
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Jan. 31, 2020
shares
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Dec. 31, 2021
USD ($)
plan
$ / shares
shares
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Dec. 31, 2020
USD ($)
$ / shares
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Dec. 31, 2019
USD ($)
$ / shares
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of active individual stock incentive plans | plan |
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1
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| Shares remained available for future grants (in shares) | shares |
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507,699
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| Stock-based compensation expense |
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$ 2,060,000
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$ 1,905,000
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$ 1,872,000
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| Tax benefit recognized related to stock-based compensation expense |
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579,000
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535,000
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526,000
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| Tax expense (benefit) from stock compensation |
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$ (85,000)
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25,000
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(137,000)
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| Price as a percentage of fair market value that stock options may not be granted below |
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100.00%
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| Percentage of ownership of common stock by participants that if greater causes greater grant price |
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10.00%
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| Price as a percentage of fair market value that stock options may not be granted below for anyone who owns more than 10% common stock |
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110.00%
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| Expiration period of options granted for those who own more than 10% common stock |
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5 years
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| Vested and exercisable options in-the-money (in shares) | shares |
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128,203
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| Net proceeds from exercise of stock options |
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$ 159,000
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21,000
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185,000
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| Total intrinsic value of options exercised |
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173,000
|
8,000
|
659,000
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| Cash paid by the Company to net settle employee taxes on restricted stock and options |
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346,000
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233,000
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402,000
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| Fair value of options vested |
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171,000
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216,000
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187,000
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| Fair value of restricted stock awards vested |
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1,700,000
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1,300,000
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$ 1,200,000
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| Fair market share price (in usd per share) | $ / shares |
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$ 30.35
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| Non-Employee Director |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Tax benefit recognized related to stock-based compensation expense |
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71,000
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80,000
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$ 71,000
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| Stock options |
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|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock-based compensation expense |
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187,000
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190,000
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190,000
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| Tax benefit recognized related to stock-based compensation expense |
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$ 52,000
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$ 53,000
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$ 54,000
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| Term in years |
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10 years
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10 years
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10 years
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| Cash paid by the Company to net settle employee taxes on restricted stock and options |
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$ 16,000
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$ 0
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$ 157,000
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| Unrecognized stock-based compensation expense |
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$ 342,000
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| Remaining vesting period unrecognized compensation expense is to be recognized |
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2 years 6 months
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| Restricted Stock |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Cash paid by the Company to net settle employee taxes on restricted stock and options |
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$ 330,000
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233,000
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245,000
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| Unrecognized stock-based compensation expense |
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$ 2,000,000
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| Remaining vesting period unrecognized compensation expense is to be recognized |
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2 years 2 months 12 days
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| Restricted Stock | Employee |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Award vesting period |
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4 years
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| Restricted Stock | Non-Employee Director |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Award vesting period |
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2 years
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| Restricted Stock and Common Stock |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock-based compensation expense |
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$ 1,600,000
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1,400,000
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1,400,000
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| Tax benefit recognized related to stock-based compensation expense |
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456,000
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402,000
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401,000
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| Common stock in Lieu of Cash | Non-Employee Director |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock-based compensation expense |
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$ 252,000
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$ 286,000
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$ 253,000
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| Number of shares issued in lieu of cash to directors (in shares) | shares |
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11,532
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8,346
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| Common stock in Lieu of Cash | Non-Employee Director | Subsequent Event |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of shares issued in lieu of cash to directors (in shares) | shares |
7,375
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| Quarterly Average |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Fair market share price (in usd per share) | $ / shares |
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$ 34.14
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$ 24.77
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| Vesting, Year Two | Stock options |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options granted, vesting percentage |
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50.00%
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| Vesting, Year Four | Stock options |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options granted, vesting percentage |
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50.00%
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