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Offsetting Derivative and Other Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Gross Amount of Recognized Assets or Liabilities [Member]    
Derivative [Line Items]    
Derivative Assets Interest Rate Contracts $ 387 $ 623
Derivative assets 387 623
Derivative Liabilities Interest Rate Contracts 10 0
Derivative liabilities 10 0
Gross Amount Offset in the Condensed Statement of Financial Condition [Member]    
Derivative [Line Items]    
Derivative Assets Interest Rate Contracts 0 0
Derivative assets 0 0
Derivative Liabilities Interest Rate Contracts 0 0
Derivative liabilities 0 0
Net Amount of Assets or Liabilities Presented in the Condensed Statement of Financial Condition [Member]    
Derivative [Line Items]    
Derivative Assets Interest Rate Contracts 387 623
Derivative assets 387 623
Derivative Liabilities Interest Rate Contracts 10 0
Derivative liabilities 10 0
Gross Amount Not Offset in the Condensed Statement of Financial Condition, Financial Instruments [Member]    
Derivative [Line Items]    
Derivative Assets Interest Rate Contracts 0 0
Derivative assets 0 0
Derivative Liabilities Interest Rate Contracts 0 0
Derivative liabilities 0 0
Gross Amount Not Offset in the Condensed Statement of Financial Condition, Cash Collateral Received [Member]    
Derivative [Line Items]    
Derivative Assets Interest Rate Contracts 0 0
Derivative assets 0 0
Derivative Liabilities Interest Rate Contracts 0 0
Derivative liabilities 0 0
Net Amount [Member]    
Derivative [Line Items]    
Derivative Assets Interest Rate Contracts 387 623
Derivative assets 387 623
Derivative Liabilities Interest Rate Contracts 10 0
Derivative liabilities $ 10 $ 0