Stock-Based Compensation Plans (Tables)

9 Months Ended

Sep. 30, 2017

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

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

The following table summarizes the Company’s stock option activity for the nine-month period ended September 30, 2017:

					Weighted
			Weighted		Average
			Average		Remaining		Aggregate
			Exercise		Contractual		Intrinsic
	Shares		Price		Term (Years)		Value*
Outstanding at December 31, 2016		1,486,257	$	26.13
Granted		211,200	$	27.94
Exercised		(81,464)	$	24.71
Forfeited or expired		(14,175)	$	26.46
Outstanding at September 30, 2017		1,601,818	$	26.44		3.9	$	3,149,000
Exercisable at September 30, 2017		898,106	$	26.19		2.4	$	1,992,000

* 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 September 29, 2017, the last trading day of the quarter, of $28.38 and the exercise price multiplied by the number of in-the-money outstanding and exercisable stock options.

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

The following table summarizes the Company’s stock option exercise activity for the three and nine months ended September 30, 2017 and 2016:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
	(Dollars in thousands)
Total intrinsic value of stock options exercised	$	208	$	14	$	272	$	87
Cash received from stock option exercises	$	1,575	$	132	$	2,013	$	585
Income tax benefit from the exercise of stock options	$	81	$	5	$	106	$	34

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

The following table summarizes the Company’s restricted stock award activity for the nine-month period ended September 30, 2017:

					Weighted
			Weighted		Average
	Shares of		Average		Remaining		Aggregate
	Restricted		Grant Date		Contractual		Intrinsic
	Stock		Fair Value		Term (Years)		Value*
Non-vested at December 31, 2016		58,500	$	26.09
Issued		30,800		27.94
Vested		(18,600)		26.05
Forfeited		-		-
Non-vested at September 30, 2017		70,700	$	26.90		2.9	$	2,006,000

* The aggregate intrinsic value of non-vested restricted stock was calculated using the market value of the Company's stock on September 29, 2017, the last trading day of the quarter, of $28.38 multiplied by the number of non-vested restricted shares outstanding.