Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2015

Stock-Based Compensation [Abstract]

Summary of Restricted Stock Activity

	Three Months Ended
	March 31, 2015
	Shares		Fair Value
Balance at December 31, 2014	51,161		$	48.13
Granted	35,657		$	50.55
Vested	(20,441	)	$	43.97
Balance at March 31, 2015	66,377		$	50.71

Summary of SARs Activity

		Weighted-		Average	Aggregate
		Average		Remaining	Intrinsic
		Exercise		Contractual	Value
	Shares	Price		Term Years	(In thousands)
Outstanding at December 31, 2014	353,955	$	35.52	6.77	$	6,277
Exercised	(35,511)	$	28.20
Outstanding at March 31, 2015	318,444	$	36.33	6.71	$	6,307
Exercisable at March 31, 2015	264,976	$	33.34	6.37	$	6,043

Summary of Non-vested SARs Activity

			Weighted-Average
	Shares		Grant Date Fair Value
Non-vested at December 31, 2014	124,982		$	45.85
Vested	(71,514	)	$	41,87
Non-vested at March 31, 2015	53,468		$	51.19

Schedule of Assumptions used in SARs Granted

	Three Months Ended March 31,
	2015	2014
Risk-free interest rate	N/A	2.38	%
Expected life	N/A	7 yrs.
Expected volatility	N/A	28.11	%
Expected dividend yield	N/A	1.30	%