Stock Option Plan (Tables)

12 Months Ended

Dec. 31, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Weighted-Average Black-Scholes Fair Value Assumptions

The fair value of each grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions used for grants in 2013, 2012 and 2011:

	2013			2012			2011
Expected dividends		1.12	%		1.08	%		1.12	%
Expected term (in years)		9.56			6.09			7.75
Expected volatility		25	%		27	%		25	%
Risk-free rate		2.04	%		1.27	%		2.74	%

Summary of the Stock Option Activity

A summary of the stock option activity for 2013, 2012 and 2011 is as follows:

	2013					2012					2011
	Shares			Weighted Average Exercise Price		Shares			Weighted Average Exercise Price		Shares			Weighted Average Exercise Price
Outstanding at beginning of year		48,987		$	34.24		52,708		$	31.24		53,892		$	29.46
Granted		5,500			44.16		6,000			42.06		4,500			39.88
Exercised		(5,973	)		26.00		(8,788	)		21.50		(5,284	)		20.76
Forfeited or expired		(860	)		33.07		(933	)		34.85		(400	)		23.63
Outstanding at end of year		47,654		$	36.43		48,987		$	34.24		52,708		$	31.24
Options exercisable at year end		12,009		$	32.35		11,453		$	29.69		13,227		$	25.00

Summary of Information about Stock Options

The following table summarizes information about stock options outstanding at December 31, 2013:

	Options Outstanding					Options Exercisable
Range of Exercise Prices	Number Outstanding at 12/31/13		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Number Exercisable at 12/31/13		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term
$ 17.20 - $ 25.79		3,682	$	23.27	.9 years		2,075	$	23.44	.9 years
$ 25.80 - $ 38.70		29,122	$	35.09	4.9 years		8,984	$	33.50	4.3 years
$ 38.71 - $ 45.75		14,850	$	42.32	8.4 years		950	$	40.88	7.6 years
		47,654					12,009
Aggregate intrinsic value (in thousands)	$	444				$	161