STOCK-BASED COMPENSATION - Performance Share Awards - Peer Group Market Condition Vesting (Details) - Performance Shares - January 28, 2017 - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Stock-based compensation
Performance period	3 years
Shares
Nonvested (in shares)	78,118
Granted (in shares)	23,056	23,056
Vested (in shares)	(24,425)
Nonvested (in shares)	76,749
Weighted Average Fair Value
Nonvested (in dollars per share)	$ 47.01
Granted (in dollars per share)	62.27
Vested (in dollars per share)	(50.27)
Nonvested (in dollars per share)	$ 50.56
Compensation cost
Unrecognized compensation cost	$ 2.4
Weighted average period of recognition of unrecognized compensation cost	2 years 2 months 12 days
Minimum
Stock-based compensation
Vesting percentage	0.00%
Maximum
Stock-based compensation
Vesting percentage	150.00%

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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.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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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.

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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).

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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).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of vesting of award under share-based payment arrangement.

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