Other assets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Other Assets Disclosure [Abstract]
Net deferred tax assets (net of valuation allowance)	$ 896,426	$ 953,676
Investments under equity method	234,408	210,001
Prepaid taxes	47,837	39,405
Other prepaid expenses	42,977	33,384
Capitalized software costs	79,393	81,862
Derivative assets	23,348	19,229
Trades receivables from brokers and counterparties	37,674	35,099
Receivables from investment maturities	301,000	125,000
Principal, interest and escrow servicing advances	50,881	41,916
Guaranteed mortgage loan claims receivable	44,836	59,659
Operating ROU assets	117,879	125,573
Finance ROU assets	17,917	18,884
Others	137,989	104,125
Total other assets	$ 2,032,565	$ 1,847,813
Operating Lease Right Of Use Asset Statement Of Financial Position	Other assets	Other assets
Finance Lease Right Of Use Asset Statement Of Financial Position	Other assets	Other assets