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STOCK-BASED COMPENSATION PLANS - RSAs & Performance-Based RSUs (Details)	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Restricted Stock Awards (RSAs)
Number of shares
Beginning balance (in shares) | shares	49,682
Granted (in shares) | shares	39,915
Vested (in shares) | shares	(38,036)
Ending balance (in shares) | shares	51,561
Weighted average price at grant
Beginning balance (in dollars per share) | $ / shares	$ 47.78
Granted (in dollars per share) | $ / shares	51.41
Vested (in dollars per share) | $ / shares	47.33
Ending balance (in dollars per share) | $ / shares	$ 50.92
Restricted Stock Unit Award (RSUs)
Number of shares
Beginning balance (in shares) | shares	86,456
Granted (in shares) | shares	32,720
Performance criteria adjustment (in shares) | shares	12,487
Vested (in shares) | shares	(41,731)
Forfeited (in shares) | shares	(2,145)
Ending balance (in shares) | shares	87,787
Weighted average price at grant
Beginning balance (in dollars per share) | $ / shares	$ 41.23
Granted (in dollars per share) | $ / shares	51.41
Performance criteria adjustment (in dollars per share) | $ / shares	47.96
Vested (in dollars per share) | $ / shares	40.10
Forfeited (in dollars per share) | $ / shares	36.75
Ending balance (in dollars per share) | $ / shares	$ 46.62

X

- Definition

Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Performance Criteria Adjustment

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Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Performance Criteria Adjustment, Weighted Average Grant Date Fair Value

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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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-Publisher FASB
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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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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 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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