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Fair Value Option - Additional Information (Details) - Loans Receivable [Member] - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Nonaccrual loans $ 0 $ 0
Accruing loans contractually past due 90 days or more $ 0 $ 0