STOCK-BASED COMPENSATION PLAN Restricted Stock Activity (Details) - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Weighted Average Fair Value
Weighted average fair value nonvested shares outstanding, beginning balance (in USD per share)	$ 29.57
Weighted average fair value nonvested shares outstanding - granted (in USD per share)	31.03
Weighted average fair value nonvested shares outstanding - vested (in USD per share)	26.07
Weighted average fair value nonvested shares outstanding - cancelled/forfeited (in USD per share)	31.57
Weighted average fair value nonvested shares outstanding, ending balance (in USD per share)	$ 31.50	$ 29.57
Officers & Key Employees
Restricted stock award activity, excluding accrued dividend equivalents [Roll Forward}
Nonvested Shares Outstanding, beginning balance (in shares)	411,809
Granted (in shares)	184,791	201,858	167,734
Vested (in shares)	(148,213)
Cancelled/Forfeited (in shares)	(46,241)
Nonvested Shares Outstanding, ending balance (in shares)	402,146	411,809
Directors
Restricted stock award activity, excluding accrued dividend equivalents [Roll Forward}
Nonvested Shares Outstanding, beginning balance (in shares)	26,416
Granted (in shares)	30,961
Vested (in shares)	(26,416)
Cancelled/Forfeited (in shares)	0
Nonvested Shares Outstanding, ending balance (in shares)	30,961	26,416

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)
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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.

+ References

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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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