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Accounting Policies - Transfers of Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]    
Securities Purchased under Agreements to Resell $ 0 $ 0
Security Owned and Sold, Not yet Purchased Fair Value, Security Sold, Not yet Purchased $ 0 $ 0