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Derivative and Other Financial Instruments with Off-Balance Sheet Risks - Schedule of Undisbursed Funds Commitments (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Jun. 30, 2019
Derivative [Line Items]    
Total $ 18,991 $ 12,328
Undisbursed loan funds - Construction loans    
Derivative [Line Items]    
Total 4,029 6,592
Undisbursed lines of credit - Commercial business loans    
Derivative [Line Items]    
Total 935 1,003
Undisbursed lines of credit - Consumer loans    
Derivative [Line Items]    
Total 448 479
Commitments to extend credit on loans to be held for investment    
Derivative [Line Items]    
Total $ 13,579 $ 4,254