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Troubled Debt Restructures - Additional Information (Detail)
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Loan
Contract
Mar. 31, 2019
USD ($)
Contract
Sep. 30, 2019
Contract
Mar. 31, 2020
USD ($)
Contract
Mar. 31, 2019
Contract
Financing Receivable Modifications [Line Items]          
Outstanding balance of TDRs $ 6,900,000     $ 6,900,000  
Number of contracts on non-accruing basis | Contract     2    
Outstanding balance of TDRs non accruing $ 72,000     $ 72,000  
Number of TDR's payment default | Contract       2 1
TDR is defined as being past due 90 days        
Allowance for loan loss on TDR $ 114,000 $ 136,000      
Number of Loans | Contract 4 1      
Recorded Investments $ 6,900,000     $ 6,900,000  
Total COVID-19 modifications [Member]          
Financing Receivable Modifications [Line Items]          
Outstanding balance of TDRs $ 26,564,000     26,564,000  
Number of Loans | Loan 61        
Recorded Investments $ 26,564,000     $ 26,564,000