Nature of operations and basis of presentation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reclassification [Line items]
Equipment expenses	$ 35,626	$ 32,919	$ 32,514
Professional fees	172,043	126,721	132,414
Technology and software expenses	291,902	277,979	263,886
Processing and transactional services	127,145	121,367	112,039
Communications	14,885	14,029	13,230
Other operating expenses	$ 109,446	92,169	81,349
Net effect on operating expenses		665,184	635,432
As Reported
Reclassification [Line items]
Equipment expenses		92,097	88,932
Professional fees		410,865	394,122
Technology and software expenses		0	0
Processing and transactional services		0	0
Communications		25,234	23,496
Other operating expenses		136,988	128,882
Net effect on operating expenses		665,184	635,432
Adjustments
Reclassification [Line items]
Equipment expenses		(59,178)	(56,418)
Professional fees		(284,144)	(261,708)
Technology and software expenses		277,979	263,886
Processing and transactional services		121,367	112,039
Communications		(11,205)	(10,266)
Other operating expenses		(44,819)	(47,533)
Net effect on operating expenses		$ 0	$ 0