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Description of Business and Basis of Presentation (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	Jul. 20, 2021 USD ($) vote $ / shares shares	Jun. 29, 2021	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($)	Jul. 19, 2021 $ / shares shares	Jun. 30, 2021
Subsidiary, Sale of Stock [Line Items]
Proceeds from initial public offering, net of underwriters' fees and issuance costs | $			$ 366,805	$ 0	$ 0
Issuance costs | $			$ (299)	$ (311)	$ (351)
Common stock, shares authorized (in shares)			3,000,000,000	0
Preferred stock, shares authorized (in shares)			200,000,000	127,097,070
Shares issued upon conversion per share (in shares)	1
Shares issued (in shares)			230,325,000	0
Shares outstanding (in shares)			230,325,000	0
Reverse stock split conversion ratio		0.333
Title365
Subsidiary, Sale of Stock [Line Items]
Interest acquired							90.10%
IPO
Subsidiary, Sale of Stock [Line Items]
Capital stock reserved for future issuance (in shares)						3,200,000,000
Class A Common Stock
Subsidiary, Sale of Stock [Line Items]
Par value (in dollars per share) | $ / shares			$ 0.00001	$ 0.00001
Proceeds from initial public offering, net of underwriters' fees and issuance costs | $	$ 366,700
Common stock, shares authorized (in shares)			1,800,000,000
Shares issued in conversion of convertible preferred stock (in shares)	146,872,568
Shares issued (in shares)	214,132,175		217,691,000
Shares outstanding (in shares)	214,132,175		217,691,000
Voting rights | vote	1
Class A Common Stock | Founder And Head Of Blend
Subsidiary, Sale of Stock [Line Items]
Shares converted (in shares)	12,883,331
Class A Common Stock | IPO
Subsidiary, Sale of Stock [Line Items]
Number of shares sold (in shares)	22,468,111
Par value (in dollars per share) | $ / shares	$ 0.00001					$ 0.00001
Share price (in dollars per share) | $ / shares	$ 18.00
Underwriting discounts and commissions expense | $	$ (27,300)
Issuance costs | $	$ (10,400)
Class B Common Stock
Subsidiary, Sale of Stock [Line Items]
Par value (in dollars per share) | $ / shares			$ 0.00001	0.00001
Common stock, shares authorized (in shares)			600,000,000
Shares converted (in shares)	1
Shares issued (in shares)	12,883,331		12,633,000
Shares outstanding (in shares)	12,883,331		12,633,000
Voting rights | vote	40
Class C Common Stock
Subsidiary, Sale of Stock [Line Items]
Par value (in dollars per share) | $ / shares			$ 0.00001	$ 0.00001
Common stock, shares authorized (in shares)			600,000,000
Shares issued (in shares)			0
Shares outstanding (in shares)			0
Founders Convertible Preferred Stock
Subsidiary, Sale of Stock [Line Items]
Shares issued (in shares)	0
Shares outstanding (in shares)	0

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