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, 2023	Dec. 31, 2022
Assets:
Marketable securities	$ 239	$ 788
Loans held for sale, at fair value	616,420	138,345
Total assets	635,142	153,453
Liabilities:
Contingent consideration	20,056	8,343
Total Liabilities	25,312	17,721
Rate lock commitments
Assets:
Derivative asset	5,651	3,181
Liabilities:
Derivative liability	2,431	8,754
Forward sale contracts
Assets:
Derivative asset	12,832	11,139
Liabilities:
Derivative liability	2,825	624
Level 1
Assets:
Marketable securities	239	788
Loans held for sale, at fair value	0	0
Total assets	239	788
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	616,420	138,345
Total assets	616,420	138,345
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	18,483	14,320
Liabilities:
Contingent consideration	20,056	8,343
Total Liabilities	25,312	17,721
Level 3 | Rate lock commitments
Assets:
Derivative asset	5,651	3,181
Liabilities:
Derivative liability	2,431	8,754
Level 3 | Forward sale contracts
Assets:
Derivative asset	12,832	11,139
Liabilities:
Derivative liability	$ 2,825	$ 624