Fair Value of Financial Instruments (Narrative, Assets Measured at Fair Value on a Nonrecurring Basis) (Details) (Nonrecurring Basis, USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Losses on impaired loans charged through allowance for loan losses	$ 0.1	$ 0.4
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, aggregate outstanding principal balance	2.6	2.6
Impaired loans, fair value	$ 2.2	$ 2.2