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Subsequent events (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jul. 21, 2020
Jun. 30, 2020
Jun. 30, 2019
Dividends [Abstract]      
Common stock, dividends declared (in dollars per share)   $ 0.44 $ 0.40
Federal Reserve Bank [Member] | PPP Loans [Member]      
Borrowings with Federal Reserve Bank [Abstract]      
Amount outstanding   $ 10.9  
2019 Annual Dividend [Member]      
Dividends [Abstract]      
Common stock, dividends declared (in dollars per share)   $ 0.44  
Subsequent Event [Member] | 2020 Q4 Dividend [Member]      
Dividends [Abstract]      
Common stock, dividends declared (in dollars per share) $ 0.12    
Percentage of increase in cash dividend rate 9.10%    
Dividends payable, date of record Aug. 14, 2020    
Dividends payable, date paid Aug. 31, 2020    
Dividends payable, date declared Jul. 21, 2020    
Subsequent Event [Member] | 2020 Annual Dividend [Member]      
Dividends [Abstract]      
Common stock, dividends declared (in dollars per share) $ 0.48