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SHARE-BASED COMPENSATION PLANS (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The following weighted-average assumptions were used to determine compensation expense related to stock options in 2018 and 2017:

		2018				2017
Risk-free interest rate			2.80	%			2.04	%
Expected dividend yield			2.47	%			3.15	%
Expected term			8.0				8.0
Expected volatility			19.9	%			19.7	%

Share-based Compensation, Stock Options, Activity [Table Text Block]

The following tables summarize stock option activity under the Company’s plans:

Stock Options

		Years ended December 31,
		2018								2017
Stock Options		Shares				Weighted Average Exercise Price				Shares				Weighted Average Exercise Price
Outstanding at beginning of year			1,502,493			$	26.57				1,486,257			$	26.13
Granted			129,200				37.22				211,200				27.94
Exercised			(429,047	)			25.96				(174,989	)			24.48
Forfeited or expired			(29,026	)			26.67				(19,975	)			26.53
Outstanding at end of year			1,173,620			$	27.96				1,502,493			$	26.57
Exercisable at end of year			692,007			$	26.92				877,131			$	26.59
Weighted average fair market value of options granted		$	7.07							$	4.05

		Weighted Average Remaining Contractual Life (in Years)			Aggregate Intrinsic Value
Outstanding - December 31, 2018		4.2			$	2,452,000
Exercisable - December 31, 2018		2.3			$	1,560,000

Schedule of Nonvested Share Activity [Table Text Block]

The aggregate intrinsic value of outstanding and exercisable stock options is defined as the difference between the market value of the Company’s stock on December 31, 2018 of $29.17 and the exercise price multiplied by the number of in-the-money outstanding and exercisable stock options.

Non-vested Stock Options

		Number of Options				Weighted Average Exercise Price				Weighted Average Fair Value
Non-vested - December 31, 2016			724,125			$	26.20			$	3.07
Granted			211,200				27.94				4.05
Vested			(296,638	)			26.71				3.01
Forfeited			(13,325	)			26.16				3.12
Non-vested - December 31, 2017			625,362			$	26.55			$	3.43
Granted			129,200				37.22				7.07
Vested			(243,798	)			26.42				3.25
Forfeited			(29,151	)			26.67				3.46
Non-vested - December 31, 2018			481,613			$	29.46			$	4.49

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

The following table summarizes information about outstanding and exercisable stock options at December 31, 2018:

				Options Outstanding												Options Exercisable
Range of Exercise Prices				Number of Options Outstanding				Weighted Average Remaining Contractual Life (in Years)				Weighted Average Exercise Price				Number of Options Exercisable				Weighted Average Exercise Price
$25.51 to $25.86					448,225				3.2			$	25.57				256,600			$	25.59
$27.04 to $37.22					725,395				4.8			$	29.43				435,407			$	27.70
					1,173,620				4.2			$	27.96				692,007			$	26.92

Cash Proceeds Received and Tax Benefit from Share-based Payment Awards [Table Text Block]

The following table summarizes stock option activity for the years ended December 31: 

		2018				2017
		(Dollars in thousands)
Total intrinsic value of stock options exercised		$	3,822			$	618
Net proceeds from stock option exercises		$	4,403			$	4,284
Income tax benefit from the exercise of stock options		$	994			$	188
Total fair value of stock options vested		$	793			$	892

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

The following table summarizes restricted stock award activity during the years ended December 31, 2017 and 2018:

		Shares of Restricted Stock				Weighted Average Grant Date Fair Value
Non-vested - December 31, 2016			58,500			$	26.09
Issued			30,800				27.94
Vested			(23,250	)			26.54
Non-vested - December 31, 2017			66,050			$	26.79
Issued			25,319				37.22
Vested			(25,514	)			27.49
Forfeited			(4,375	)			26.60
Non-vested - December 31, 2018			61,480			$	30.74

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