Condensed Financial Information of Parent Company Only Disclosure (Details) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Common Stock, par value	$ 1	$ 1
Common Stock, shares authorized	23,000,000	23,000,000
Common Stock, shares issued	18,569,183	18,531,158
Common Stock, shares outstanding	17,265,758	17,371,040
Treasury Stock, shares	1,303,425	1,160,118
Parent Company
Common Stock, par value	$ 1.00	$ 1.00
Common Stock, shares authorized	23,000,000	23,000,000
Common Stock, shares issued	18,569,183	18,531,158
Common Stock, shares outstanding	17,265,758	17,371,040
Treasury Stock, shares	1,303,425	1,160,118