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Nature of operations and basis of presentation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reclassification [Line items]      
Equipment expenses $ 37,057 $ 35,626 $ 32,919
Professional fees 161,142 172,043 126,721
Technology and software expenses 290,615 291,902 277,979
Processing and transactional services 138,070 127,145 121,367
Communications 16,664 14,885 14,029
Other operating expenses $ 97,279 $ 109,446 92,169
Net effect on operating expenses     665,184
As Reported      
Reclassification [Line items]      
Equipment expenses     92,097
Professional fees     410,865
Technology and software expenses     0
Processing and transactional services     0
Communications     25,234
Other operating expenses     136,988
Net effect on operating expenses     665,184
Adjustments      
Reclassification [Line items]      
Equipment expenses     (59,178)
Professional fees     (284,144)
Technology and software expenses     277,979
Processing and transactional services     121,367
Communications     (11,205)
Other operating expenses     (44,819)
Net effect on operating expenses     $ 0