LEASES - Direct Financing Leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Leases [Abstract]
Interest income on lease receivable	$ 3,965	$ 2,048	$ 11,344	$ 5,826
Interest income on deferred fees and costs	117	63	304	326
Total direct financing lease income	4,082	$ 2,111	11,648	$ 6,152
Leasing receivables
Lease receivables	257,519		257,519		$ 217,076
Unearned income	(33,430)		(33,430)		(28,446)
Deferred fees and costs	3,450		3,450		1,962
Net investment in direct financing leases	$ 227,539		$ 227,539		$ 190,592