Other income and operating expenses - Balance Sheet Impact of PPP Activities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets
Restricted cash	$ 30,063	$ 48,146	$ 41,032
Paycheck Protection Program loans	34,597	186,985
Paycheck Protection Program loans, held at fair value	165	576
Accrued interest	64,504	34,578
Total Assets	12,441,217	11,620,977
Liabilities
Paycheck Protection Program Liquidity Facility (PPPLF) borrowings	36,036	201,011
Interest payable	35,373	34,785
Accrued PPP Related Costs	146	4,016
Repair and denial reserve	6,974	10,846
Total Liabilities	9,794,455	9,722,382
Paycheck Protection Program loans
Assets
Paycheck Protection Program loans	34,432	186,409
Paycheck Protection Program loans, held at fair value	165	576
PPP fee receivable	283	328
Accrued interest	586	3,196
Total Assets	35,466	190,509
Liabilities
Paycheck Protection Program Liquidity Facility (PPPLF) borrowings	36,036	201,011
Interest payable	340	1,176
Deferred LSP revenue	6	122
Accrued PPP Related Costs	146	4,016
Payable to third parties	735	277
Repair and denial reserve	1,027	4,878
Total Liabilities	38,290	211,480
Paycheck Protection Program loans, held for investment
Assets
Paycheck Protection Program loans	34,432	186,409
Paycheck Protection Program loans, at fair value
Assets
Paycheck Protection Program loans	$ 165	$ 576