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Derivative and Other Financial Instruments with Off-Balance Sheet Risks: Commitments on Undisbursed Funds Held for Investment Policy (Details) - USD ($)
Jun. 30, 2017
Jun. 30, 2016
Derivative [Line Items]    
Undisbursed commitments to extend credit, Assets $ 623 $ 0
Undisbursed commitments to extend credit, Liabilities 0 3,196
Other Assets    
Derivative [Line Items]    
Undisbursed commitments to extend credit, Assets 1,500,000 3,800,000
Other Liabilities    
Derivative [Line Items]    
Undisbursed commitments to extend credit, Liabilities $ 0 $ 3,200,000