Basis of presentation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Reclassification [Line items]
Equipment expenses	$ 8,905	$ 8,735	$ 26,878	$ 25,798
Professional fees	38,514	47,662	122,077	122,884
Technology and software expenses	72,930	68,341	213,843	213,638
Processing and transactional services	37,899	32,368	108,609	94,358
Communications	4,220	3,858	12,483	11,028
Other operating expenses	$ 23,061	39,593	$ 70,274	81,814
Net effect on operating expenses		200,557		549,520
As Reported
Reclassification [Line items]
Equipment expenses		26,626		75,193
Professional fees		112,221		335,590
Technology and software expenses		0		0
Processing and transactional services		0		0
Communications		6,224		18,364
Other operating expenses		55,486		120,373
Net effect on operating expenses		200,557		549,520
Adjustments
Reclassification [Line items]
Equipment expenses		(17,891)		(49,395)
Professional fees		(64,559)		(212,706)
Technology and software expenses		68,341		213,638
Processing and transactional services		32,368		94,358
Communications		(2,366)		(7,336)
Other operating expenses		(15,893)		(38,559)
Net effect on operating expenses		$ 0		$ 0