STOCK-BASED COMPENSATION PLANS - Activity of Unvested Restricted Stock Awards (Details) - Restricted Stock [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restricted Shares
Unvested, beginning of period (in shares)	176,408	196,788
Awards (in shares)	51,456	52,132
Forfeitures (in shares)	(2,619)	(12,884)
Vestings (in shares)	(47,977)	(59,628)
Unvested, end of period (in shares)	177,268	176,408	196,788
Weighted-average grant date fair value
Unvested, beginning of period (in dollars per share)	$ 47.24	$ 45.58
Awards (in dollars per share)	79.51	51.64
Forfeitures (in dollars per share)	54.15	37.14
Vestings (in dollars per share)	52.84	47.80
Unvested, end of period (in dollars per share)	$ 54.98	$ 47.24	$ 45.58
Unrecognized stock-based compensation expense	$ 7.1
Award vesting period	5 years
Weighted-average period for recognition of unrecognized compensation cost	3 years 8 months 12 days
Total fair value of restricted stock vested	$ 2.5	$ 2.9	$ 3.8

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 equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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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