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Bank segment - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Allowance for credit losses      
Securities sold under agreements to repurchase $ 162.0   $ 88.0
American Savings Bank (ASB)      
Allowance for credit losses      
Advances from the FHLB 80.0   0.0
Securities sold under agreements to repurchase $ 161.6   $ 88.3
Minimum benchmark percentage of loan to appraisal ratio which mortgage insurance is required 80.00%    
Minimum benchmark percentage of loan to appraisal ratio on non-owner occupied residential property 75.00%    
Home equity line of credit      
Allowance for credit losses      
Conversion of debt $ 10.0 $ 9.8  
Commercial      
Allowance for credit losses      
Conversion of debt 1.0 0.6  
Consumer      
Allowance for credit losses      
Conversion of debt $ 1.7 $ 1.5