Other Borrowings (Maturity Dates Senior Notes) (Details) (USD $) In Millions, unless otherwise specified				1 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Jan. 31, 2012 Senior Notes to two of the accredited investors	Dec. 03, 2010 Senior Notes transaction	Mar. 11, 2011 Senior Notes	Dec. 31, 2010 Senior Notes	Dec. 31, 2012 December 1, 2015 Senior Notes	Dec. 31, 2012 February 1, 2017 Senior Notes	Dec. 31, 2012 February 1, 2018 Senior Notes	Dec. 31, 2012 February 1, 2019 Senior Notes
Debt Instrument [Line Items]
Issued senior notes, face amount			$ 10.0		$ 3.0	$ 24.5
Private transactions				5
Stated interest rate, percent					5.00%
Senior debt, maturity amount							17.5	7.0	7.0	6.0
Senior notes	$ 37.5	$ 27.5