Other Assets - Other (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Carrying value:
Margin deposits	$ 154,321	$ 135,645
Capitalized software, net	140,419	148,736
Operating lease right-of-use assets	$ 46,490	$ 49,926
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Servicing fee receivables, net	$ 34,312	$ 37,271
Other servicing receivables	45,280	30,530
Interest receivable	39,837	35,196
Prepaid expenses	35,325	36,044
Real estate acquired in settlement of loans	18,195	14,982
Furniture, fixtures, equipment and building improvements, net	17,951	19,016
Deposits securing Assets sold under agreements to repurchase and Notes payable secured by mortgage servicing assets	16,175	15,653
Other	75,063	59,461
Other assets	623,368	582,460
Asset Pledged as Collateral without Right
Carrying value:
Other assets	16,175	15,653
Asset Pledged as Collateral without Right | Deposits.
Carrying value:
Other assets	$ 16,175	$ 15,653