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Fair value measurements - Assets measured on a nonrecurring basis (Details) - USD ($)
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Estimated fair value      
Fair value measurements on a recurring basis      
Loans $ 5,283,885,000   $ 5,439,330,000
Estimated fair value | Quoted prices in active markets for identical assets (Level 1)      
Fair value measurements on a recurring basis      
Loans 0   0
Estimated fair value | Significant  other observable  inputs (Level 2)      
Fair value measurements on a recurring basis      
Loans 50,884,000   28,354,000
Estimated fair value | Significant unobservable inputs (Level 3)      
Fair value measurements on a recurring basis      
Loans 5,233,001,000   5,410,976,000
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 | Quoted prices in active markets for identical assets (Level 1)      
Fair value measurements on a recurring basis      
Loans 0   0
Mortgage servicing rights     0
Fair value measurements on a nonrecurring basis | Significant  other observable  inputs (Level 2)      
Fair value measurements on a recurring basis      
Loans 0   0
Mortgage servicing rights     0
Fair value measurements on a nonrecurring basis | Significant unobservable inputs (Level 3)      
Fair value measurements on a recurring basis      
Loans 204,000   387,000
Mortgage servicing rights     3,001,000
Fair value measurements on a nonrecurring basis | Estimated fair value      
Fair value measurements on a recurring basis      
Loans $ 204,000   387,000
Mortgage servicing rights     $ 3,001,000