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Stock-Based Compensation Plans - Narrative (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 $ / shares shares | Dec. 31, 2021 USD ($) tranche $ / shares shares | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | May 31, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Tax withholding associated with awards issued | $ |  | $ 681 | $ 690 | $ 955 |
Employee |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock awarded (in shares) | shares | 21,336 |  |  |  |
Grant date fair value (in dollars per share) | $ / shares | $ 41.42 |  |  |  |
Employee Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares authorized (in shares) | shares |  | 500,000 |  |  |
Employee discount (as a percent) |  | 15.00% |  |  |
Employee purchase price (as a percent) |  | 12.00% |  |  |
Stock-based compensation expense | $ |  | $ 55 |  |  |
Stock-settled bonus awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) |  | 3 years |  |  |
Number of tranches | tranche |  | 3 |  |  |
Vested paid in full (as a percent) |  | 100.00% |  |  |
Stock sale restriction (in years) |  | 2 years |  |  |
Compensation expense not yet recognized | $ |  | $ 649 |  |  |
Fair value of awards | $ |  | $ 884 | $ 1,200 | 1,600 |
Weighted average amortization period of compensation not yet recognized (in years) |  | 1 year 10 months 24 days |  |  |
Stock-settled bonus awards | Share-based Payment Arrangement, Tranche One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage (as a percent) |  | 33.33% |  |  |
Stock-settled bonus awards | Share-based Payment Arrangement, Tranche Two |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage (as a percent) |  | 33.33% |  |  |
Employee Vesting Stock Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) |  | 3 years |  |  |
Employee Vesting Stock Awards | Share-based Payment Arrangement, Tranche One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage (as a percent) |  | 33.33% |  |  |
Employee Vesting Stock Awards | Share-based Payment Arrangement, Tranche Two |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage (as a percent) |  | 33.33% |  |  |
Employee Vesting Stock Awards | Share-based Payment Arrangement, Tranche Three |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage (as a percent) |  | 33.33% |  |  |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) |  | 1 year 10 months 24 days |  |  |
Stock-based compensation expense | $ |  | $ 1,400 |  |  |
Grant date fair value (in dollars per share) | $ / shares |  | $ 38.80 | $ 32.23 |  |
Fair value of shares vested | $ |  | $ 1,700 | $ 1,600 | $ 597 |
Granted (in shares) | shares |  | 54,449 |  |  |
Granted (in dollars per share) | $ / shares |  | $ 41.90 | $ 33.68 | $ 32.16 |
Performance share awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for issuance (in shares) | shares |  | 36,000 |  |  |
Award vesting period (in years) |  | 3 years |  |  |
Vested paid in full (as a percent) |  | 100.00% |  |  |
Compensation expense not yet recognized | $ |  | $ 722 |  |  |
Weighted average amortization period of compensation not yet recognized (in years) |  | 2 years |  |  |
Granted (in shares) | shares |  | 42,000 |  |  |
Granted (in dollars per share) | $ / shares |  | $ 42.01 |  |  |
Performance share awards | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage (as a percent) |  | 0.00% |  |  |
Performance share awards | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage (as a percent) |  | 100.00% |  |  |
Restricted Stock Plan 2006 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares authorized (in shares) | shares |  | 1,500,000 |  |  | 500,000
Shares available for issuance (in shares) | shares |  | 661,126 |  |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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