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Commitments and Contingent Liabilities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Loss Contingencies [Line Items]
Inherent risks associated with off balance sheet commitments	$ 2.9	$ 1.9
Commitments to Extend Credit [Member]
Loss Contingencies [Line Items]
Amount of commitment	1,100.0
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Amount of commitment	68.6
Maximum [Member]
Loss Contingencies [Line Items]
Expiry period of standby letter of credit, maximum	2 years
Maximum [Member] \| Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
One standby letter of credit	$ 2

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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