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Fair value measurements - Assets Measured on a Nonrecurring Basis (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Estimated fair value      
Fair value measurements on a recurring basis      
Loans, net $ 5,038,775,000 $ 4,802,053,000  
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 9,233,000 1,809,000  
Estimated fair value | Level 3      
Fair value measurements on a recurring basis      
Loans, net 5,029,542,000 4,800,244,000  
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      
Loans, net 0 0  
Real estate acquired in settlement of loans   0  
Fair value measurements on a nonrecurring basis | Level 2      
Fair value measurements on a recurring basis      
Loans, net 0 0  
Real estate acquired in settlement of loans   0  
Fair value measurements on a nonrecurring basis | Level 3      
Fair value measurements on a recurring basis      
Loans, net 224,000 77,000  
Real estate acquired in settlement of loans   186,000  
Fair value measurements on a nonrecurring basis | Estimated fair value      
Fair value measurements on a recurring basis      
Loans, net $ 224,000 77,000  
Real estate acquired in settlement of loans   $ 186,000