Stock-Based Compensation Plans (Tables)

9 Months Ended

Sep. 30, 2015

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, 2015:

					Weighted
			Weighted		Average
			Average		Remaining		Aggregate
			Exercise		Contractual		Intrinsic
	Shares		Price		Term (Years)		Value*
Outstanding at December 31, 2014		1,355,416	$	25.36
Granted		299,700	$	25.64
Exercised		(138,190)	$	19.51
Forfeited or expired		(14,600)	$	26.59
Outstanding at September 30, 2015		1,502,326	$	25.94		3.9	$	2,111,000
Exercisable at September 30, 2015		544,856	$	25.20		2.6	$	1,117,000

* The aggregate intrinsic value of outstanding and exercisable stock options is defined as the difference between the closing price of the Company's stock on September 30, 2015, the last trading day of the quarter, of $27.04 and the exercise price multiplied by the number of in-the-money outstanding and exercisable stock options.

Schedule of Cash Proceeds Received from Share-based Payment Awards [Table Text Block]

The following table summarizes the Company’s stock option exercise activity for the three and nine months ended September 30, 2015 and 2014:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
	(Dollars in thousands)
Total intrinsic value of stock options exercised	$	30	$	146	$	1,188	$	242
Cash received from stock option exercises	$	184	$	618	$	2,696	$	1,226
Income tax benefit from the exercise of stock options	$	12	$	48	$	463	$	85

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, 2015:

					Weighted
			Weighted		Average
	Shares of		Average		Remaining		Aggregate
	Restricted		Grant Date		Contractual		Intrinsic
	Stock		Fair Value		Term (Years)		Value*
Non-vested at December 31, 2014		54,050	$	26.58
Issued		21,900		25.64
Vested		(6,050)		27.04
Forfeited		-		-
Non-vested at September 30, 2015		69,900	$	26.25		2.6	$	1,890,000

* The aggregate intrinsic value of non-vested restricted stock was calculated using the closing price of the Company's stock on September 30, 2015, the last trading day of the quarter, of $27.04 multiplied by the number of non-vested restricted shares outstanding.