Fair Value Measurements (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, measured by using the fair value of collateral, carrying amount	$ 95.2
Impaired loans, measured by using the fair value of collateral, valuation allowance	7.1
Impaired loans, measured by using the fair value of collateral, additional specific reserves	$ 1.9
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of discount on collateral for estimated cost of sales	10.00%
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of discount on collateral for estimated cost of sales	7.00%