Other income and operating expenses - Income and Expenses Related to Activities (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Other income
Origination income		$ 33,617	$ 1,709	$ 36,112	$ 2,517
Interest income		63,211	57,034	132,762	105,787
Interest and Fee Income		59,379	54,237	125,816	100,439
Other operating expenses
Direct operating expenses		9,430	2,734	12,455	3,923
R&D reserve		(2,651)	(76)	(2,515)	(165)
Interest expense		43,408	35,753	90,338	71,529
Total other operating expenses		17,745	8,085	31,487	14,947
Net income (loss)		34,663	$ 11,245	$ (16,853)	$ 41,693
PPP Loans
Other income
PPP processing fees	$ 5,200
Interest and Fee Income		32,318
Other operating expenses
Total other operating expenses		9,246
Net income (loss)		23,072
PPP Loans | Other Income
Other income
Origination income		26,116
PPP processing fees		5,155
Other operating expenses
R&D reserve		2,319
PPP Loans | Servicing income
Other income
LSP fee income		853
PPP Loans | Interest income
Other income
Interest income		194
PPP Loans | Other operating expenses
Other operating expenses
Direct operating expenses		5,525
PPP Loans | Interest expense
Other operating expenses
Interest expense		$ 1,402