Significant Accounting Policies (Allowance for Loan Losses) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Accounting Policies [Abstract]
Minimum amount of loan reviewed for detailed credit quality	$ 0.25
Revised time period for historical loan loss experience	5 years
Minimum amount of impaired loan secured by real estate requiring an updated annual appraisal	$ 0.25
Period of weighted average losses for the calculation of the allowance for loan losses	5 years