Other assets and liabilities - Summary of TBAs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
To Be Announced Securities [Roll Forward]
Receivable/(Payable) from/to Broker	$ 801	$ 1,887
Derivative Asset	18,499	19,781
Derivative Liability	(9)	(92)
TBA | Long
To Be Announced Securities [Roll Forward]
Beginning Notional Amount	0
Buys or Covers	1,650,000
Sales or Shorts	(1,650,000)
Ending Notional Amount	0	0
Fair Value as of Period End	0
Receivable/(Payable) from/to Broker	0
Derivative Asset	0
Derivative Liability	0
TBA | Short
To Be Announced Securities [Roll Forward]
Beginning Notional Amount	(385,963)	0
Buys or Covers	1,320,852	1,390,550
Sales or Shorts	(974,889)	(1,776,513)
Ending Notional Amount	(40,000)	(385,963)
Fair Value as of Period End	(38,556)	(394,225)
Receivable/(Payable) from/to Broker	39,206	394,212
Derivative Asset	650	0
Derivative Liability	$ 0	$ (13)