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Fair value measurements - Assets Measured on a Nonrecurring Basis (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Level 3      
Fair value measurements on a recurring basis      
Mortgage servicing rights $ 6,260,000    
Estimated fair value      
Fair value measurements on a recurring basis      
Loans, net 5,591,422,000 $ 5,157,537,000  
Estimated fair value | Level 1      
Fair value measurements on a recurring basis      
Loans, net 0 0  
Estimated fair value | Level 2      
Fair value measurements on a recurring basis      
Loans, net 16,806,000 12,295,000  
Estimated fair value | Level 3      
Fair value measurements on a recurring basis      
Loans, net 5,574,616,000 5,145,242,000  
Fair value measurements on a nonrecurring basis | American Savings Bank (ASB)      
Fair value measurements on a recurring basis      
Adjustments to fair value of loans held for sale 0   $ 0
Fair value measurements on a nonrecurring basis | Level 1      
Fair value measurements on a recurring basis      
Mortgage servicing rights 0    
Loans, net   0  
Fair value measurements on a nonrecurring basis | Level 2      
Fair value measurements on a recurring basis      
Mortgage servicing rights 0    
Loans, net   0  
Fair value measurements on a nonrecurring basis | Level 3      
Fair value measurements on a recurring basis      
Mortgage servicing rights 6,260,000    
Loans, net   25,000  
Fair value measurements on a nonrecurring basis | Estimated fair value      
Fair value measurements on a recurring basis      
Mortgage servicing rights $ 6,260,000    
Loans, net   $ 25,000