Fair Value of Financial Assets and Liabilities - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Assets, Unobservable Input Reconciliation:
Opening Balance	$ 8,501	$ 41,488
Total realized and unrealized gains (losses) included in Net income	30,932	(4,321)
Issuances	0	0
Settlements	(8,501)	(28,666)
Closing Balance	30,932	8,501
Unrealized gains (losses) outstanding	30,932	8,501
Liabilities, Unobservable Input Reconciliation:
Opening Balance	17,354	49,429
Total realized and unrealized gains (losses) included in Net income	14,045	3,665
Issuances	0	0
Settlements	(7,461)	(35,740)
Closing Balance	23,938	17,354
Unrealized (gains) losses outstanding, at end of period	23,939	17,354
Rate lock commitments
Assets, Unobservable Input Reconciliation:
Opening Balance	3,957	21,034
Total realized and unrealized gains (losses) included in Net income	9,049	3,957
Issuances	0	0
Settlements	(3,957)	(21,034)
Closing Balance	9,049	3,957
Unrealized gains (losses) outstanding	9,049	3,957
Liabilities, Unobservable Input Reconciliation:
Opening Balance	2,836	2,977
Total realized and unrealized gains (losses) included in Net income	13,365	2,836
Issuances	0	0
Settlements	(2,837)	(2,977)
Closing Balance	13,364	2,836
Unrealized (gains) losses outstanding, at end of period	13,365	2,836
Forward sale contracts
Assets, Unobservable Input Reconciliation:
Opening Balance	4,544	7,632
Total realized and unrealized gains (losses) included in Net income	21,883	4,544
Issuances	0	0
Settlements	(4,544)	(7,632)
Closing Balance	21,883	4,544
Unrealized gains (losses) outstanding	21,883	4,544
Liabilities, Unobservable Input Reconciliation:
Opening Balance	2,180	14,971
Total realized and unrealized gains (losses) included in Net income	367	2,180
Issuances	0	0
Settlements	(2,180)	(14,971)
Closing Balance	367	2,180
Unrealized (gains) losses outstanding, at end of period	367	2,180
Nasdaq Forwards
Assets, Unobservable Input Reconciliation:
Opening Balance	0	12,822
Total realized and unrealized gains (losses) included in Net income	0	(12,822)
Issuances	0	0
Settlements	0	0
Closing Balance	0	0
Unrealized gains (losses) outstanding	0	0
Contingent consideration
Liabilities, Unobservable Input Reconciliation:
Opening Balance	12,338	31,481
Total realized and unrealized gains (losses) included in Net income	313	(1,351)
Issuances	0	0
Settlements	(2,444)	(17,792)
Closing Balance	10,207	12,338
Unrealized (gains) losses outstanding, at end of period	$ 10,207	$ 12,338