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Nature of Operations and Summary of Significant Accounting Policies - Estimated Useful Lives of Premises and Equipment (Detail)
12 Months Ended
Jun. 30, 2021
Maximum [Member] | Buildings and Improvements [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 40 years
Maximum [Member] | Furniture and Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 5 years
Minimum [Member] | Buildings and Improvements [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 35 years
Minimum [Member] | Furniture and Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 3 years