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Derivative and Other Financial Instruments with Off-Balance Sheet Risks (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Derivative [Line Items]    
Total $ 15,098 $ 14,652
Undisbursed loan funds - Construction loans    
Derivative [Line Items]    
Total 5,747 4,302
Undisbursed lines of credit - Commercial business loans    
Derivative [Line Items]    
Total 1,488 495
Undisbursed lines of credit - Consumer loans    
Derivative [Line Items]    
Total 487 503
Commitments to extend credit on loans to be held for investment    
Derivative [Line Items]    
Total $ 7,376 $ 9,352