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Derivative and Other Financial Instruments with Off-Balance Sheet Risks - Summary of Undisbursed funds to borrowers on existing lines of credit to originate loans to be held for investment (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Derivative [Line Items]    
Undisbursed funds on existing lines of credit and commitments to originate loans $ 13,948 $ 14,652
Undisbursed loan funds - Construction loans    
Derivative [Line Items]    
Undisbursed funds on existing lines of credit and commitments to originate loans 5,110 4,302
Undisbursed lines of credit - Commercial business loans    
Derivative [Line Items]    
Undisbursed funds on existing lines of credit and commitments to originate loans 1,548 495
Undisbursed lines of credit - Consumer loans    
Derivative [Line Items]    
Undisbursed funds on existing lines of credit and commitments to originate loans 497 503
Commitments to extend credit on loans to be held for investment    
Derivative [Line Items]    
Undisbursed funds on existing lines of credit and commitments to originate loans $ 6,793 $ 9,352