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STOCK-BASED COMPENSATION PLANS (Tables)

12 Months Ended

Dec. 31, 2017

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 2017, 2016 and 2015:

		2017				2016				2015
Risk-free interest rate			2.04	%			1.09	%			1.36	%
Expected dividend yield			3.15	%			3.29	%			3.12	%
Expected term			8.0				4.3 years				4.3 years
Expected volatility			19.7	%			21.3	%			21.6	%

Schedule of 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,
		2017								2016								2015
Stock Options		Shares				Weighted Average Exercise Price				Shares				Weighted Average Exercise Price				Shares				Weighted Average Exercise Price
Outstanding at beginning of year			1,486,257			$	26.13				1,351,826			$	26.09				1,355,416			$	25.36
Granted			211,200				27.94				277,800				25.51				299,700				25.64
Exercised			(174,989	)			24.48				(123,294	)			24.28				(279,090	)			22.02
Forfeited or expired			(19,975	)			26.53				(20,075	)			26.52				(24,200	)			26.58
Outstanding at end of year			1,502,493			$	26.57				1,486,257			$	26.13				1,351,826			$	26.09
Exercisable at end of year			877,131			$	26.59				762,132			$	26.07				594,906			$	25.55
Weighted average fair market value of options granted		$	4.05							$	3.05							$	3.30

		Weighted Average Remaining Contractual Life (in Years)				Aggregate Intrinsic Value
Outstanding – December 31, 2017			3.8			$	4,733,000
Exercisable – December 31, 2017			2.4			$	2,746,000

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 29, 2017 of $29.72 and the exercise price multiplied by the number of in-the-money outstanding and exercisable stock options.

Non-vested Stock Options

Non-vested Stock Options		Number of Options				Weighted Average Exercise Price				Weighted Average Fair Value
Non-vested – December 31, 2014			751,582			$	26.74			$	3.12
Granted			299,700				25.64				3.30
Vested			(275,187	)			26.14				3.36
Forfeited			(19,175	)			26.59				3.14
Non-vested – December 31, 2015			756,920			$	26.53			$	3.10
Granted			277,800				25.51				3.05
Vested			(293,720	)			26.39				3.13
Forfeited			(16,875	)			26.37				3.10
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

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, 2017:

		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
$23.53 to $25.86			689,993				3.4			$	25.11				350,843			$	24.67
$27.04 to $28.50			812,500				4.2			$	27.81				526,288			$	27.87
			1,502,493				3.8			$	26.57				877,131			$	26.59

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:

		2017				2016				2015
		(Dollars in thousands)
Total intrinsic value of stock options exercised		$	618			$	455			$	1,705
Cash received from stock option exercises		$	4,284			$	2,994			$	6,144
Income tax benefit from the exercise of stock options		$	188			$	178			$	665
Total fair value of stock options vested		$	892			$	919			$	925

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

The following table summarizes restricted stock award activity during the years ended December 31, 2015, 2016 and 2017:

 

Non-vested Restricted Stock		Shares of Restricted Stock				Weighted Average Grant Date Fair Value
Non-vested – December 31, 2014			54,050			$	26.58
Issued			21,900				25.64
Vested			(20,700	)			25.94
Non-vested – December 31, 2015			55,250				26.45
Issued			26,900				25.51
Vested			(22,025	)			26.26
Forfeited			(1,625	)			26.30
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

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Tabular disclosure of cash received from exercise of stock options and similar instruments granted under share-based payment arrangements and tax benefit from exercise of stock options.

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