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Derivative and Other Financial Instruments with Off-Balance Sheet Risks: Off-Balance-Sheet Credit Exposure, Policy (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Derivative [Line Items]    
Commitments to extend credit $ 4,302 $ 9,015
Loans Held for Investment and Loans Held for Sale [Member]    
Derivative [Line Items]    
Commitments to extend credit $ 66,300 $ 111,800