STOCK-BASED COMPENSATION - RSUs (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Weighted-Average Grant Date Fair Value Per Share
Period for recognition (in years)	2 years 1 month 6 days
Restricted Stock Units (RSUs)
Units (In thousands)
Outstanding beginning of period (in shares)	33,592	64,983	65,207
RSUs Granted (in shares)	67,368	17,896	9,379
Units vested (in shares)	(9,487)	(49,287)	(9,603)
Units forfeited (in shares)	0	0	0
Outstanding end of period (in shares)	91,473	33,592	64,983
Weighted-Average Grant Date Fair Value Per Share
Weighted average grant date fair value, beginning balance (in USD per share)	$ 22.88	$ 23.34	$ 22.64
Weighted average grant date fair value (in USD per share)	27.17	23.19	25.78
Weighted average grant date fair value, units vested (in USD per share)	23.19	23.60	20.96
Weighted average grant date fair value, units forfeited (in USD per share)	0	0	0
Weighted average grant date fair value, ending balance (in USD per share)	$ 26.00	$ 22.88	$ 23.34
Compensation cost not yet recognized	$ 732	$ 750	$ 695
Period for recognition (in years)	5 years

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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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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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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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