Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Apr. 21, 2021	Jun. 30, 2020
Document Type	10-K/A
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2020
Entity Registrant Name	MMA CAPITAL HOLDINGS, INC.
Entity Incorporation, State or Country Code	DE
Entity File Number	001-11981
Entity Tax Identification Number	52-1449733
Entity Address, Address Line One	3600 O’Donnell Street, Suite 600
Entity Address, City or Town	Baltimore
Entity Address, State or Province	MD
Entity Address, Postal Zip Code	21224
City Area Code	443
Local Phone Number	263-2900
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Central Index Key	0001003201
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2020
Amendment Flag	false
Entity Common Stock, Shares Outstanding		5,742,286
Entity Shell Company	false
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Public Float			$ 111,130,141
ICFR Auditor Attestation Flag	false
Common Stock [Member]
Title of 12(b) Security	Common Shares, no par value
Trading Symbol	MMAC
Security Exchange Name	NASDAQ
Common Stock Purchase Rights [Member]
Title of 12(b) Security	Common Stock Purchase Rights
Trading Symbol	MMAC
Security Exchange Name	NASDAQ