Other Assets - Other (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Carrying value:
Margin deposits	$ 192,638	$ 135,645
Capitalized software, net	125,478	148,736
Interest receivable	46,119	35,196
Servicing fees receivable, net	41,050	37,271
Other servicing receivables	46,333	30,530
Operating lease right-of-use assets	$ 39,985	$ 49,926
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Prepaid expenses	$ 38,160	$ 36,044
Real estate acquired in settlement of loans	22,420	14,982
Deposits securing Assets sold under agreements to repurchase and Notes payable secured by mortgage servicing assets	16,082	15,653
Furniture, fixtures, equipment and building improvements, net	14,577	19,016
Other	59,347	59,461
Other assets	642,189	582,460
Asset Pledged as Collateral without Right
Carrying value:
Other assets	16,082	15,653
Asset Pledged as Collateral without Right | Deposits.
Carrying value:
Other assets	$ 16,082	$ 15,653