Stock Based Compensation (Details) (USD $)	3 Months Ended				6 Months Ended						6 Months Ended	3 Months Ended		6 Months Ended				3 Months Ended		6 Months Ended			0 Months Ended		6 Months Ended		0 Months Ended	6 Months Ended		6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012		Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2013 Stock Awards [Member]	Jun. 30, 2013 Stock Awards [Member] Independent Directors [Member]	Jun. 30, 2012 Stock Awards [Member] Independent Directors [Member]	Jun. 30, 2013 Stock Awards [Member] Independent Directors [Member]	Jun. 30, 2012 Stock Awards [Member] Independent Directors [Member]	Jun. 30, 2013 Restricted Stock Units (RSUs) [Member] Tranche Individual Executive	Apr. 23, 2013 Restricted Stock Units (RSUs) [Member] Individual	Jun. 30, 2013 Restricted Stock Units (RSUs) [Member] Executive Officer [Member]	Jun. 30, 2012 Restricted Stock Units (RSUs) [Member] Executive Officer [Member]	Jun. 30, 2013 Restricted Stock Units (RSUs) [Member] Executive Officer [Member]	Jun. 30, 2012 Restricted Stock Units (RSUs) [Member] Executive Officer [Member]	Jun. 30, 2013 Time Based Restricted Stock Units [Member]	Apr. 23, 2013 Time Based Restricted Stock Units [Member] Top Executives [Member]	Apr. 23, 2013 Absolute Performance Based Restricted Stock Units [Member]	Jun. 30, 2013 Absolute Performance Based Restricted Stock Units [Member]	Mar. 11, 2013 Absolute Performance Based Restricted Stock Units [Member]	Apr. 23, 2013 Relative Performance Based Restricted Stock Units [Member]	Jun. 30, 2013 Relative Performance Based Restricted Stock Units [Member]	Mar. 11, 2013 Relative Performance Based Restricted Stock Units [Member]	Jun. 30, 2013 Relative Performance Based Restricted Stock Units [Member] Top Executives [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par value (in dollars per share)	$ 1.00				$ 1.00					$ 1.00						$ 1.00
Number of key individuals																10	11
Number of tranches																3
Shares available for grant on attainment of performance targets (in shares)																81,188
Shares issued (in shares)																57,401
Number of shares remaining to be issued (in shares)																10,000
Maximum number of shares to be issued if certain performance targets are met (in shares)																11,500	134,475
Share-based Compensation [Abstract]
Share-based Compensation Expense					$ 721,000		$ 544,000					$ 30,000	$ 214,000	$ 60,000	$ 544,000			$ 418,000	$ 184,000	$ 661,000	$ 184,000
Related Reduction in Earnings Per Share (in dollars per share)	$ (0.02)	[1]	$ (0.06)	[1]	$ (0.05)	[1]	$ (0.11)	[1]
Additional shares vested due to accelerated vesting																								3,376		18,188	1,788		5,300
Shares [Roll Forward]
Non-vested - Beginning of Period (in shares)											0					65,500
Unrestricted Shares Granted (in shares)											6,708					121,100							87,300	16,901	8,188		16,899
Shares Vested (in shares)											(6,708)					(7,402)
Shares Forfeited (in shares)											0					(6,286)
Non-vested - End of Period (in shares)											0					131,100
Weighted Average Fair Value Per Share [Roll Forward]
Non-vested - Beginning of Period (in dollars per share)											$ 0					$ 19.04
Unrestricted Shares Granted (in dollars per share)											$ 17.89					$ 17.37									$ 19.35
Shares Vested (in dollars per share)											$ 17.89					$ 19.15
Shares Forfeited (in dollars per share)											$ 0					$ 17.73
Non-vested - End of Period (in dollars per share)											$ 0					$ 18.77
Maximum shares allocated to each share based compensation unit (in shares)																						1			1.5			1.5
Vesting period																						3 years	1 year		2 years			3 years		1 year
Number of remaining shares expected to vest (in shares)																									3,000
Number of top executives																4
Percentage of restricted stock units vested (in hundredths)																												53.00%
Number of shares of common stock retired to meet tax liabilities (in shares)	11,509				11,509				8,186

[1] Same for basic and diluted earnings per share