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Commitments and Contingencies, Guarantees and Indemnifications (Details) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Guarantor Obligations [Line Items]    
Assets Held As Collateral $ 0 $ 0
Payment or Performance Guarantee | Customer Loans for Farm Rewiring Program    
Guarantees [Abstract]    
Guarantees issued and outstanding 1,000,000 1,000,000
Current exposure under these guarantees $ 100,000 $ 200,000