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Equity Plans - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 31, 2022
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Fair value of restricted stock awards | $ 3,332 | $ 3,333 | $ 2,420 |
Performance-based and market-based restricted stock awards issued (in shares) | 7,327 | 5,327 | 6,120 |
Performance-based and market-based restricted stock awards vested (in shares) | 15,577 |  |  |
Performance-based and market-based restricted stock awards outstanding (in shares) | 51,160 |  |  |
Shares issued during the period under the plan | 35,304 | 31,750 | 30,255 |
Restricted stock and deferred restricted stock |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Unrecognized compensation cost | $ 4,421 |  |  |
Period for recognition of compensation cost | 1 year 6 months 21 days |  |  |
Performance Shares | Minimum |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Range of shares issuable | 0.00% |  |  |
Performance Shares | Maximum |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Range of shares issuable | 150.00% |  |  |
Market-based RSU | Minimum |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Range of shares issuable | 0.00% |  |  |
Market-based RSU | Maximum |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Range of shares issuable | 200.00% |  |  |
Incentive Plan | Restricted stock and deferred restricted stock |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Number of shares available for issuance (in shares) | 685,193 |  |  |
Employee Stock Purchase Plan |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Purchase price of common stock to employees under the plan, percent | 85.00% |  |  |
Maximum percent of base salary employees can designate for share purchase under the plan | 10.00% |  |  |
Expenses recorded under the plan | $ 361 | $ 342 | $ 294 |
Employee Stock Purchase Plan | Subsequent Event |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Unrecognized compensation cost |  |  |  | $ 162
Common Stock | Incentive Plan |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Number of shares reserved for issuance under the plan (in shares) | 1,800,000 |  |  |
Maximum number of shares per employee (in shares) | 600,000 |  |  |
Shares issued pursuant to the plan (in shares) | 946,086 | 880,495 | 819,340 |
Shares issuable under the plan upon exercise of outstanding awards (in shares) | 168,721 | 178,106 | 174,764 |
Common Stock | Employee Stock Purchase Plan |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Number of shares reserved for issuance under the plan (in shares) | 400,000 |  |  |
Number of shares available for issuance (in shares) | 185,509 |  |  |

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