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Commitments and Contingent Liabilities (Supply Commitment) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Supply Commitment [Line Items]
Supply Commitment, Remaining Minimum Amount Committed	$ 88,459	$ 87,584
Loan commitments [Member]
Supply Commitment [Line Items]
Supply Commitment, Remaining Minimum Amount Committed	87,147	86,047
Commercial Letters of Credit [Member]
Supply Commitment [Line Items]
Supply Commitment, Remaining Minimum Amount Committed	$ 1,312	$ 1,537

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity must commit resources to supply goods or services to one or more customers.

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