Consolidation of Southern Trust Mortgage (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended
	May 30, 2008	Dec. 31, 2012
Business Acquisition [Line Items]
Percentage interest in issued and outstanding membership interest (in hundredths)		62.40%
Southern Trust Mortgage [Member]
Business Acquisition [Line Items]
Cost to acquire membership interest	$ 1.6
Percentage ownership interest, minimum (in hundredths)		50.00%
Percentage interest in issued and outstanding membership interest (in hundredths)		62.40%