Commitments, Contingent Liabilities and Off-Balance Sheet Risk (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies
Line of Credit Facility, Maximum Borrowing Capacity	195.2
Assets Held-in-trust	68.6
Stand-by Letters of Credit [Member]
Commitments and Contingencies	2.1
Unfunded Loan And Lines Of Credit Commitments [Member]
Commitments and Contingencies	67.8
Unfunded Loan And Lines Of Credit Commitments [Member] \| Variable Rate [Member]
Commitments and Contingencies	60.2
Unfunded Loan And Lines Of Credit Commitments [Member] \| Fixed Rate [Member]
Commitments and Contingencies	$ 7.4

The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

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Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.

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