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EMPLOYEE BENEFIT PLANS - Summary of changes in non-vested restricted shares (Details) - Restricted Stock - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares
Non-vested shares at beginning	815,540	947,710
Granted	179,000	141,600
Vested	(310,520)	(260,770)
Forfeited	(5,800)	(13,000)
Non-vested shares at ending	678,220	815,540	947,710
Weighted Average Grant-Date Fair Value
Non-vested shares at beginning	$ 11.29	$ 9.41
Granted	15.00	17.21	$ 13.97
Vested	9.91	7.65
Forfeited	13.09	11.68
Non-vested shares at ending	$ 12.89	$ 11.29	$ 9.41

X

- Definition

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

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- Definition

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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- Definition

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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- Definition

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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