Allowance for credit losses - Troubled debt restructuring according to their accruing status - Subnote (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Financing Receivable
Financing Receivable Modifications Recorded Investment	$ 1,644,647
Accruing
Financing Receivable
Financing Receivable Modifications Recorded Investment	1,495,309
Mortgages
Financing Receivable
Financing Receivable Modifications Recorded Investment	1,256,766
Mortgages | Accruing
Financing Receivable
Financing Receivable Modifications Recorded Investment	1,169,976
Mortgages | Guaranteed by U.S. sponsored entities | Accruing
Financing Receivable
Financing Receivable Modifications Recorded Investment	$ 725,000