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Mortgage Loan Servicing and Loans Originated for Sale - Additional information (Details) - USD ($)
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Servicing Assets at Fair Value      
Escrow balance $ 157,000 $ 68,000  
CPR assumption (weighted-average) 21.82% 26.07%  
Weighted-average discount rate 9.10% 9.11%  
Mortgage servicing assets at carrying value $ 384,000 $ 673,000  
Mortgage servicing assets, fair value 208,000 382,000 $ 627,000
Allowance for mortgage servicing assets 176,000 291,000 $ 298,000
Additions 2,000 0  
Amortization 291,000 252,000  
Loans serviced under MPF program 5,300,000 7,400,000  
Recourse liability 25,000 70,000  
Proceeds from sale of loans 147,000 0  
Outstanding loans held for sale $ 0 0  
Mortgage Partnership Finance (MPF) Program      
Servicing Assets at Fair Value      
Basis point of loss absorbed by first loss account 0.04    
Recourse liability $ 25,000 70,000  
Loans Serviced for Others [Member]      
Servicing Assets at Fair Value      
Escrow balance $ 182,000 $ 377,000