Fair Value of Financial Assets and Liabilities - Fair Value Hierarchy of Financial Assets and Liabilities under U.S. GAAP Guidance (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Assets:
Marketable securities	$ 136	$ 99
Loans held for sale, at fair value	1,027,781	528,944
Total	1,038,780	539,906
Liabilities:
Contingent consideration	23,122	25,740
Total	43,802	47,067
Rate lock commitments
Assets:
Derivative asset	6,900	9,604
Liabilities:
Derivative liability	2,888	1,023
Forward Sales Contracts
Assets:
Derivative asset	3,963	1,259
Liabilities:
Derivative liability	17,792	20,304
Level 1
Assets:
Marketable securities	136	99
Loans held for sale, at fair value	0	0
Total	136	99
Liabilities:
Contingent consideration	0	0
Total	0	0
Level 1 | Rate lock commitments
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability	0	0
Level 1 | Forward Sales Contracts
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability	0	0
Level 2
Assets:
Marketable securities	0	0
Loans held for sale, at fair value	1,027,781	528,944
Total	1,027,781	528,944
Liabilities:
Contingent consideration	0	0
Total	0	0
Level 2 | Rate lock commitments
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability	0	0
Level 2 | Forward Sales Contracts
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability	0	0
Level 3
Assets:
Marketable securities	0	0
Loans held for sale, at fair value	0	0
Total	10,863	10,863
Liabilities:
Contingent consideration	23,122	25,740
Total	43,802	47,067
Level 3 | Rate lock commitments
Assets:
Derivative asset	6,900	9,604
Liabilities:
Derivative liability	2,888	1,023
Level 3 | Forward Sales Contracts
Assets:
Derivative asset	3,963	1,259
Liabilities:
Derivative liability	$ 17,792	$ 20,304