STOCK OWNERSHIP AND BENEFIT PLANS - Activity of Nonvested Shares of Restricted Stock and Restricted Stock Units (Details) - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
2016 Omnibus Incentive Plan \| Restricted stock
Shares
Balance at the beginning of the period (in shares)	289,931	256,068
Granted (in shares)	75,531	102,817
Vested (in shares)	(71,317)	(63,288)
Forfeited (in shares)	(2,665)	(5,666)
Balance at the end of the period (in shares)	291,480	289,931
Weighted Average Grant Date Fair Value
Balance at the beginning of the period (in dollars per share)	$ 18.81	$ 15.31
Granted (in dollars per share)	48.74	25.11
Vested (in dollars per share)	24.67	14.89
Forfeited (in dollars per share)	18.65	19.26
Balance at the end of the period (in dollars per share)	$ 25.12	$ 18.81
2016 Omnibus Incentive Plan \| Restricted stock units
Shares
Balance at the beginning of the period (in shares)	95,325	72,500
Granted (in shares)	25,576	36,000
Vested (in shares)	(28,843)	(13,175)
Forfeited (in shares)	(4,999)
Balance at the end of the period (in shares)	87,059	95,325
Weighted Average Grant Date Fair Value
Balance at the beginning of the period (in dollars per share)	$ 17.99	$ 15.62
Granted (in dollars per share)	45.97	21.88
Vested (in dollars per share)	18.16	15.61
Forfeited (in dollars per share)	19.67
Balance at the end of the period (in dollars per share)	$ 26.05	$ 17.99
2006 Stock Incentive Plan \| Restricted stock
Shares
Balance at the beginning of the period (in shares)	63,035	153,030
Vested (in shares)	(62,537)	(71,223)
Forfeited (in shares)	(498)	(18,772)
Balance at the end of the period (in shares)	0	63,035
Weighted Average Grant Date Fair Value
Balance at the beginning of the period (in dollars per share)	$ 22.91	$ 15.14
Vested (in dollars per share)	8.65	10.03
Forfeited (in dollars per share)	6.22	8.40
Balance at the end of the period (in dollars per share)	$ 0.00	$ 22.91
2006 Stock Incentive Plan \| Restricted stock units
Shares
Balance at the beginning of the period (in shares)	26,329	58,398
Vested (in shares)	(26,329)	(32,069)
Balance at the end of the period (in shares)	0	26,329
Weighted Average Grant Date Fair Value
Balance at the beginning of the period (in dollars per share)	$ 16.69	$ 13.42
Vested (in dollars per share)	6.96	10.74
Balance at the end of the period (in dollars per share)	$ 0.00	$ 16.69

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

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).

+ References

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

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.

+ References

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-Publisher FASB
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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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.

+ References

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