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Stockholders' Equity and Regulatory Capital - Additional Information (Details)
$ in Thousands
12 Months Ended
Jun. 30, 2021
USD ($)
Apr. 30, 2021
Jun. 30, 2020
USD ($)
Apr. 30, 2020
Jan. 01, 2020
USD ($)
Capital conservation buffer ratio 2.5        
Amount of distributions as dividend of equity $ 42,900        
Assets $ 2,700,530   $ 2,542,157    
Minimum          
Assets         $ 10,000,000
Tier I Capital (to Risk-Weighted Assets) | Maximum          
Minimum leverage ratio         9
Community Bank Leverage Ratio | Maximum          
Ratio of risk-based capital 9        
2020 Year | Community Bank Leverage Ratio | Minimum          
Minimum leverage ratio       8  
2021 Year | Community Bank Leverage Ratio | Minimum          
Minimum leverage ratio   8.5      
2021 Year After | Community Bank Leverage Ratio | Minimum          
Minimum leverage ratio       9