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Derivative and Other Financial Instruments with Off-Balance Sheet Risks - Schedule of Undisbursed Funds Commitments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jun. 30, 2019
Derivative [Line Items]    
Total $ 18,160 $ 12,328
Undisbursed Lines of Credit - Construction Loans    
Derivative [Line Items]    
Total 6,821 6,592
Undisbursed Lines Of Credit Commercial Business Loans    
Derivative [Line Items]    
Total 850 1,003
Undisbursed Lines of Credit - Consumer Loans    
Derivative [Line Items]    
Total 468 479
Commitments to extend credit on loans to be held for investment    
Derivative [Line Items]    
Total $ 10,021 $ 4,254