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Related party transactions - Financial Transactions With Related Parties (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Related Party Transaction [Line Items]      
Deposits $ 11,986,708 $ 12,991,076  
Asset management 32,468 29,727 $ 29,853
Custody and other administration services 13,319 13,626 15,232
Other non-interest income 3,831 5,971 4,795
Interest expense - deposits 170,504 45,176 15,490
Asset Management Arrangement | Related Party      
Related Party Transaction [Line Items]      
Deposits 4,633 20,549  
Asset management 9,461 7,379 5,217
Custody and other administration services 1,163 839 622
Other non-interest income 0 0 6
Interest expense - deposits $ 489 $ 0 $ 0