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Loans and Allowance for Loan Losses - Association's Loan Portfolio Aging Analysis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total Past Due $ 1,072 $ 680  
Current 511,912 519,846  
Total loans 512,984 520,526 $ 525,033
Total Loans 90 Days Past Due & Accruing 0 118  
Commercial [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total Past Due   86  
Current 163,859 155,798  
Total loans 163,859 155,884 157,096
Commercial [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total Past Due 9 9  
Current 88,953 103,079  
Total loans 88,962 103,088 109,182
Consumer [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total Past Due 32 6  
Current 7,583 7,647  
Total loans 7,615 7,653 8,098
One- to four-family [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total Past Due 1,031 524  
Current 116,823 116,911  
Total loans 117,854 117,435 125,574
Total Loans 90 Days Past Due & Accruing   118  
Multi-family [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Current 97,211 104,433  
Total loans 97,211 104,433 106,886
Home equity lines of credit [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total Past Due   55  
Current 6,274 6,633  
Total loans 6,274 6,688 8,147
Construction [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Current 31,209 25,345  
Total loans 31,209 25,345 $ 10,050
Financing Receivables, 30 to 59 Days Past Due [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total Past Due 1,003 476  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total Past Due   86  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total Past Due 9 9  
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total Past Due 32 6  
Financing Receivables, 30 to 59 Days Past Due [Member] | One- to four-family [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total Past Due 962 320  
Financing Receivables, 30 to 59 Days Past Due [Member] | Home equity lines of credit [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total Past Due   55  
Financing Receivables, 60 to 89 Days Past Due [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total Past Due 35 52  
Financing Receivables, 60 to 89 Days Past Due [Member] | One- to four-family [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total Past Due 35 52  
Financing Receivables, 90 Days or Greater [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total Past Due 34 152  
Financing Receivables, 90 Days or Greater [Member] | One- to four-family [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total Past Due $ 34 $ 152