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Guarantees and Off-Balance Sheet Arrangements (Details) (USD $)	Mar. 31, 2013
Securities Lending
Guaranty loans	$ 150,000,000
Employee Loans
Guaranty loans	$ 2,700,000

This item represents a non-contingent liability for the fair value of an obligation to stand ready to perform over the term of a guaranty issued in the event that specified triggering events or conditions occur.

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