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Bank segment - Troubled debt restructuring - narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2023
Dec. 31, 2022
Financing Receivable, Impaired [Line Items]      
Consumer mortgage loans collateralized by residential real estate property in foreclosure process   $ 3,400,000 $ 4,200,000
Troubled debt restructurings real estate loans      
Financing Receivable, Impaired [Line Items]      
Financing receivable modifications minimum, period of payment default of loans determined to be TDRs (in days) 90 days    
Commitments to lend additional funds to borrows with impaired or modified loans     $ 0