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Bank segment - Other borrowings (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Offsetting Liabilities [Line Items]    
FHLB advances   $ 0
Federal funds purchased $ 0 0
Gross amount  of recognized  liabilities 95,000,000 115,000,000
Gross amount  offset in the  Balance Sheets 0 0
Securities sold under agreements to repurchase 95,000,000 115,000,000
Commercial account holders    
Offsetting Liabilities [Line Items]    
Securities sold under agreements to repurchase 95,000,000 115,000,000
Securities sold under agreements to repurchase collateral, financial instruments 143,000,000 130,000,000
Securities sold under agreements to repurchase, cash collateral pledged 0 0
American Savings Bank (ASB)    
Offsetting Liabilities [Line Items]    
FHLB advances 30,000,000.0  
Securities sold under agreements to repurchase $ 95,000,000.0 $ 115,000,000