Schedule II - Condensed Financial Information of Registrant, Parenthetical (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Balance Sheets [Abstract]
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares issued (in shares)	13,306,027	12,909,457
Common stock, shares outstanding (in shares)	13,306,027	12,909,457
Condensed Statements of Income [Abstract]
Operating expense, affiliated	$ 1,347,885	$ 2,044,343	$ 2,830,745
Condensed Statements of Cash Flows [Abstract]
Dividends paid to stockholders, affiliated	(6,749,153)	(6,356,760)	(6,042,846)
Parent company [Member]
Condensed Balance Sheets [Abstract]
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares issued (in shares)	13,306,027	12,909,457
Common stock, shares outstanding (in shares)	13,306,027	12,909,457
Condensed Statements of Income [Abstract]
Operating expense, affiliated	0	0	0
Condensed Statements of Cash Flows [Abstract]
Dividends paid to stockholders, affiliated	$ (6,749,153)	$ (6,356,760)	$ (6,042,846)