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Regulatory Matters - Reconciliation of Association Equity Amounts (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Association equity $ 85,304 $ 82,564 $ 82,461
Association [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Association equity 80,472 80,631  
Less net unrealized gains 2,361 4,865  
Less postretirement benefit plan (428) (662)  
Tier 1 capital 78,539 76,428  
Plus allowance for loan losses subject to limit 6,599 6,234  
Total risk-based capital $ 85,138 $ 82,662