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Common Stock Incentive Plan - Restricted Stock Narrative (Details) - Restricted stock - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2021 | May 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Common Stock Incentive Plan |  |  |  |  |
Shares granted |  |  | 133,052 | 103,473 | 87,327
Remaining unamortized share-based compensation expense |  |  | $ 9.2 |  |
Directors |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |
Shares granted | 8,000 | 36,000 |  |  |
Directors | Three-year vesting period |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |
Vesting rights percentage |  |  | 33.33% |  |
Vesting period (in years) | 3 years | 3 years | 3 years |  |
Shares granted |  | 12,000 |  |  |
Directors | Three-year vesting period | Maximum |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |
Service period as basis for restricted stock award vesting (in years) |  |  | 6 years |  |
Directors | Two-year vesting period |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |
Service period as basis for restricted stock award vesting (in years) |  |  | 6 years |  |
Vesting rights percentage |  |  | 50.00% |  |
Vesting period (in years) |  |  | 2 years |  |
Directors | One-year vesting period |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |
Service period as basis for restricted stock award vesting (in years) |  |  | 7 years |  |
Vesting rights percentage |  |  | 100.00% |  |
Vesting period (in years) |  |  | 1 year |  |
Directors | Immediate vesting |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |
Shares granted |  | 24,000 |  |  |
Directors | Immediate vesting | Minimum |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |
Service period as basis for restricted stock award vesting (in years) |  |  | 8 years |  |
Employees |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |
Vesting period (in years) |  |  | 4 years |  |
Shares granted |  |  | 89,052 |  |

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- Definition The actual period which an employee has provided service to determine the vesting period of awards granted, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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 Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made 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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