GUARANTEES AND COLLATERAL (Collateral and Restricted Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financial Instruments Owned and Pledged as Collateral [Line Items]
Restricted cash	$ 15,423	$ 17,617
Bonds Available-for-Sale	24,709	24,741
Investments in partnerships	342,310	364,990
Other Assets	17,934	17,973
Total Assets Pledged	400,376	425,321
Interest rate swap [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Restricted cash	2,960	4,463
Total Assets Pledged	$ 2,960	$ 4,463
Debt and derivatives \| SAWHF [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Ownership interest (as a percent)	11.85%	11.85%
Debt and derivatives TRSs [Member] \| SAWHF [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Restricted cash	$ 1,375	$ 1,374
Investments in partnerships	1,463	1,833
Other Assets	2,302	2,463
Total Assets Pledged	5,140	5,670
Debt Related to Real Estate Owned [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Restricted cash	250	250
Other Assets	15,632	15,510
Total Assets Pledged	15,882	15,760
Infrastructure Bond [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Restricted cash	9,827	10,020
Bonds Available-for-Sale	24,709	24,741
Total Assets Pledged	34,536	34,761
Other, Pledged or Restricted [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Restricted cash		8
Total Assets Pledged		8
Revolving Credit Facility [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Restricted cash	1,011	1,502
Investments in partnerships	340,847	363,157
Total Assets Pledged	$ 341,858	$ 364,659

MMA Capital Holdings, Inc. 10-Q