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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, 2018
Jun. 30, 2017
Derivative [Line Items]    
Undisbursed commitments to extend credit, Assets $ 0 $ 623
Undisbursed commitments to extend credit, Liabilities 440 0
Other Assets    
Derivative [Line Items]    
Undisbursed commitments to extend credit, Assets 800,000 1,500,000
Other Liabilities    
Derivative [Line Items]    
Undisbursed commitments to extend credit, Liabilities $ 500,000 $ 0