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Derivatives and Hedging Activities (Details 6) - USD ($)
$ in Thousands
Mar. 31, 2019
Sep. 30, 2018
Offsetting of Derivative Liabilities    
Net Amounts of Liabilities presented in the Statement of Financial Position   $ 132
Fair Value Hedging [Member]    
Offsetting of Derivative Assets    
Gross Amounts of Recognized Assets $ 700 747
Gross Amounts Offset in the Statement of Financial Position
Net Amounts of Assets presented in the Statement of Financial Position 700 747
Gross Amounts Not Offset in the Statement of Financial Position    
Financial Instruments
Cash Collateral Received
Net Amount
Offsetting of Derivative Liabilities    
Gross Amounts of Recognized Liabilities 5,588 7,892
Gross Amounts Offset in the Statement of Financial Position
Net Amounts of Liabilities presented in the Statement of Financial Position 5,588 7,892
Gross Amounts Not Offset in the Statement of Financial Position    
Financial Instruments
Cash Collateral Received
Net Amount