Fair Value of Financial Assets and Liabilities - Fair Value Hierarchy of Financial Assets and Liabilities under U.S. GAAP Guidance (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Assets:
Marketable securities	$ 788	$ 524,569
Loans held for sale, at fair value	138,345	1,072,479
Total assets	153,453	1,605,549
Liabilities:
Contingent consideration	8,343	12,338
Total Liabilities	17,721	17,354
Rate lock commitments
Assets:
Derivative asset	3,181	3,957
Liabilities:
Derivative liability	8,754	2,836
Forward sale contracts
Assets:
Derivative asset	11,139	4,544
Liabilities:
Derivative liability	624	2,180
Level 1
Assets:
Marketable securities	788	524,569
Loans held for sale, at fair value	0	0
Total assets	788	524,569
Liabilities:
Contingent consideration	0	0
Total Liabilities	0	0
Level 1 | Rate lock commitments
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability	0	0
Level 1 | Forward sale 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	138,345	1,072,479
Total assets	138,345	1,072,479
Liabilities:
Contingent consideration	0	0
Total Liabilities	0	0
Level 2 | Rate lock commitments
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability	0	0
Level 2 | Forward sale 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 assets	14,320	8,501
Liabilities:
Contingent consideration	8,343	12,338
Total Liabilities	17,721	17,354
Level 3 | Rate lock commitments
Assets:
Derivative asset	3,181	3,957
Liabilities:
Derivative liability	8,754	2,836
Level 3 | Forward sale contracts
Assets:
Derivative asset	11,139	4,544
Liabilities:
Derivative liability	$ 624	$ 2,180