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Transfers of Financial Assets - Short-Term Borrowings - Lines of Credit (Details)
$ in Millions
Sep. 30, 2017
USD ($)
Lines of credit  
Amount drawn under lines of credit $ 0.0
Federal Home Loan Bank line of credit  
Lines of credit  
Amount available 1,900.0
Federal Reserve Bank line of credit  
Lines of credit  
Amount available $ 679.9