Other assets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Other Assets Disclosure [Abstract]
Net deferred tax assets (net of valuation allowance)	$ 926,329	$ 1,009,068
Investments under equity method investees	251,537	236,485
Prepaid taxes	42,909	39,052
Other prepaid expenses	28,376	29,338
Capitalized software costs	136,442	93,404
Derivative assets	25,975	24,419
Trades receivables from brokers and counterparties	588	23,102
Receivables from investment maturities	14,600	176,000
Principal, interest and escrow servicing advances	43,793	48,557
Guaranteed mortgage loan claims receivable	17,226	29,648
Operating ROU assets	93,389	116,106
Finance ROU assets	19,174	21,093
Assets for pension benefit	33,233	23,404
Others	164,188	144,888
Total other assets	$ 1,797,759	$ 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