Equity - Equity (Tables)

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

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

The following tables summarize stock options, SARs, and non-vested restricted stock activity for the years ended December 31, 2015, 2014, and 2013:

Table 9.1

	For the Year Ended December 31,
	2015				2014				2013
	Stock Options and SARs		Weighted- Average Exercise Price		Stock Options and SARs		Weighted- Average Exercise Price		Stock Options and SARs		Weighted- Average Exercise Price
Outstanding, beginning of year	718,143		$	25.12	664,245		$	23.78	788,748		$	20.89
Granted	119,110		32.25		87,600		34.92		94,017		31.24
Exercised	(86,680	)	21.32		(23,035	)	20.83		(208,877	)	16.24
Canceled	(3,000	)	30.05		(10,667	)	31.16		(9,643	)	23.02
Outstanding, end of year	747,573		26.68		718,143		25.12		664,245		23.78
Exercisable at end of year	543,698		24.34		548,180		23.12		483,216		22.83
	For the Year Ended December 31,
	2015				2014				2013
	Non-vested Restricted Stock		Weighted- Average Grant Date Fair Value		Non-vested Restricted Stock		Weighted- Average Grant Date Fair Value		Non-vested Restricted Stock		Weighted- Average Grant Date Fair Value
Outstanding, beginning of year	103,772		$	31.24	98,285		$	27.66	91,311		$	18.75
Granted	76,616		32.14		57,590		33.88		73,985		30.27
Canceled	—		—		(8,360	)	21.72		(1,000	)	31.42
Vested and issued	(47,737	)	30.25		(43,743	)	28.48		(66,011	)	18.21
Outstanding, end of year	132,651		32.12		103,772		31.24		98,285		27.66

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

The following tables summarize information regarding stock options, SARs, and non-vested restricted stock outstanding as of December 31, 2015:

Table 9.2

	Outstanding		Exercisable		Vested or Expected to Vest
Range of Exercise Prices	Stock Options and SARs	Weighted- Average Remaining Contractual Life	Stock Options and SARs	Weighted- Average Remaining Contractual Life	Stock Options and SARs	Weighted- Average Remaining Contractual Life
$5.00 - $9.99	18,666	3.3 years	18,666	3.3 years	18,666	3.3 years
10.00 - 14.99	66,665	4.4 years	66,665	4.4 years	66,665	4.4 years
15.00 - 19.99	62,000	5.4 years	62,000	5.4 years	62,000	5.4 years
20.00 - 24.99	100,500	5.1 years	100,500	5.1 years	100,500	5.1 years
25.00 - 29.99	191,009	1.9 years	187,009	1.7 years	190,809	1.9 years
30.00 - 34.99	250,733	7.8 years	90,864	6.1 years	241,931	7.8 years
35.00 - 39.99	58,000	8.2 years	17,994	8.3 years	56,280	8.2 years
	747,573		543,698		736,851
	Outstanding		Expected to Vest
Weighted- Average Grant-Date Fair Value	Non-vested Restricted Stock	Weighted-Average Remaining Contractual Life	Non-vested Restricted Stock	Weighted-Average Remaining Contractual Life
$25.00 - $29.99	6,778	2.1 years	6,439	2.1 years
30.00 - 34.99	124,324	1.2 years	117,990	1.2 years
35.00 - 39.99	1,549	1.2 years	1,487	1.2 years
	132,651		125,916

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

The fair values of stock options and SARs were estimated using the Black-Scholes option pricing model based on the following assumptions:

Table 9.3

	For the Year Ended December 31,
	2015	2014	2013
Risk-free interest rate	1.2%	1.5%	0.6%
Expected years until exercise	4 years	4 years	4 years
Expected stock volatility	38.0%	49.7%	83.4%
Dividend yield	2.0%	1.6%	1.5%