Other assets (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Other Assets Disclosure [Abstract]
Net deferred tax assets (net of valuation allowance)	$ 979,304	$ 1,009,068
Investments under equity method	234,512	236,485
Prepaid taxes	61,760	39,052
Other prepaid expenses	32,486	29,338
Capitalized software costs	107,671	93,404
Derivative assets	25,195	24,419
Trades receivables from brokers and counterparties	47,171	23,102
Receivables from investment maturities	300,000	176,000
Principal, interest and escrow servicing advances	43,058	48,557
Guaranteed mortgage loan claims receivable	20,698	29,648
Operating ROU assets	104,797	116,106
Finance ROU assets	19,596	21,093
Assets for pension benefit	25,407	23,404
Others	170,900	144,888
Total other assets	$ 2,172,555	$ 2,014,564
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