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Non-interest Revenue and Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer $ 4,982 $ 4,204
Revenue Not from Contract with Customer 2,372 1,994
Total non-interest income 7,354 6,198
Deposit Account    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer 2,141 2,637
Mortgage Banking    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer 225 288
Financial Service, Other    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer $ 2,616 $ 1,279