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Revenue Recognition and Contract Costs - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenue	$ 234,495	$ 96,029	$ 50,671
Blend Platform
Disaggregation of Revenue [Line Items]
Total revenue	135,562	96,029	50,671
Mortgage Banking
Disaggregation of Revenue [Line Items]
Total revenue	108,264	80,061	40,311
Consumer Banking and Marketplace
Disaggregation of Revenue [Line Items]
Total revenue	23,120	12,624	6,333
Professional Services
Disaggregation of Revenue [Line Items]
Total revenue	4,178	3,344	4,027
Title365
Disaggregation of Revenue [Line Items]
Total revenue	$ 98,933	$ 0	$ 0

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