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Cover - USD ($) $ in Billions	12 Months Ended
Cover - USD ($) $ in Billions	Dec. 31, 2021	Mar. 02, 2022	Jun. 30, 2021
Document 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	001-38947
Entity Registrant Name	BTRS HOLDINGS INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	83-3780685
Entity Address, Address Line One	1009 Lenox Drive
Entity Address, Address Line Two	Suite 101
Entity Address, City or Town	Lawrenceville
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	08648
City Area Code	609
Local Phone Number	235-1010
Title of 12(b) Security	Class 1 Common Stock, $0.0001 par value
Trading Symbol	BTRS
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
ICFR Auditor Attestation Flag	true
Entity Public Float			$ 1.1
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the Registrant’s Proxy Statement related to its 2022 Annual Stockholder’s Meeting, scheduled to be filed with the Securities and Exchange Commission 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	0001774155
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false
Class 1 Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		159,474,754
Class 2 Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		3,395,989