Fair Value Measurements - Financial Instruments Carried at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets:
Loans, held for sale, at fair value	$ 552,935	$ 340,288
Loans, net, held at fair value	10,766	13,795
Paycheck Protection Program loans	3,243	74,931
Derivative instruments, at fair value	7,022	16,363
Residential mortgage servicing rights, at fair value	120,142	76,840
Investment in unconsolidated joint venture	8,894
Liabilities:
Derivative instruments, at fair value	410	11,604
Contingent consideration in connection with acquisitions	16,400
Recurring
Assets:
Loans, held for sale, at fair value	552,935	340,288
Loans, net, held at fair value	10,766	13,795
Paycheck Protection Program loans	3,243	74,931
Mortgage backed securities, at fair value	99,496	88,011
Derivative instruments, at fair value	7,022	16,363
Residential mortgage servicing rights, at fair value	120,142	76,840
Investment in unconsolidated joint venture	8,894
Total assets	802,498	610,228
Liabilities:
Derivative instruments, at fair value	410	11,604
Contingent consideration in connection with acquisitions	16,400
Total liabilities	16,810	11,604
Recurring | Level 2 inputs
Assets:
Loans, held for sale, at fair value	321,070	340,288
Mortgage backed securities, at fair value	97,915	62,880
Derivative instruments, at fair value	4,683
Total assets	423,668	403,168
Liabilities:
Derivative instruments, at fair value	410	11,604
Total liabilities	410	11,604
Recurring | Level 3 inputs
Assets:
Loans, held for sale, at fair value	231,865
Loans, net, held at fair value	10,766	13,795
Paycheck Protection Program loans	3,243	74,931
Mortgage backed securities, at fair value	1,581	25,131
Derivative instruments, at fair value	2,339	16,363
Residential mortgage servicing rights, at fair value	120,142	76,840
Investment in unconsolidated joint venture	8,894
Total assets	378,830	$ 207,060
Liabilities:
Contingent consideration in connection with acquisitions	16,400
Total liabilities	$ 16,400