Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	May 03, 2022	Jun. 30, 2021
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-38633
Entity Registrant Name	BM Technologies, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	82-3410369
Entity Address, Address Line One	201 King of Prussia Road
Entity Address, Address Line Two	Suite 350
Entity Address, City or Town	Wayne
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19087
City Area Code	877
Local Phone Number	327-9515
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Public Float			$ 152
Entity Common Stock, Shares Outstanding		12,273,438
Documents Incorporated by Reference	Specified portions of the registrant’s proxy statement with respect to the registrant’s 2022 Annual Meeting of Stockholders, which is to be filed pursuant to Regulation 14A within 120 days after the end of the registrant’s fiscal year ended December 31, 2021, are incorporated by reference into Part III of this Annual Report on Form 10-K.
Entity Central Index Key	0001725872
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false
Common Class A
Entity Information [Line Items]
Title of 12(b) Security	Common Stock
Trading Symbol	BMTX
Security Exchange Name	NYSEAMER
Warrant
Entity Information [Line Items]
Title of 12(b) Security	Warrants, each whole warrant exercisable for one share of Common Stock at an exercise price of $11.50 per share.
Trading Symbol	BMTX-WT
Security Exchange Name	NYSEAMER