Loans (Unfunded Commitment) (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Letters of credit [Member]
Unfunded Commitments [Line Items]
Expected usage percentage of remaining unfunded commitments			10.00%
Reserve for unfunded commitments	$ 0.6	$ 0.6