Other assets (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Other Assets Disclosure [Abstract]
Net deferred tax assets (net of valuation allowance)	$ 917,793	$ 1,009,068
Investments under equity method	248,235	236,485
Prepaid taxes	53,395	39,052
Other prepaid expenses	39,000	29,338
Capitalized software costs	117,894	93,404
Derivative assets	25,934	24,419
Trades receivables from brokers and counterparties	5,701	23,102
Receivables from investment maturities	0	176,000
Principal, interest and escrow servicing advances	44,665	48,557
Guaranteed mortgage loan claims receivable	19,736	29,648
Operating ROU assets	98,077	116,106
Finance ROU assets	19,301	21,093
Assets for pension benefit	26,409	23,404
Others	151,779	144,888
Total other assets	$ 1,767,919	$ 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