COMMITMENTS AND CONTINGENCIES - Allowance for Unfunded Commitments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Apr. 01, 2020	Jan. 01, 2020	Jan. 01, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance, Allowance	$ 149,524	$ 28,659	$ 38,189	$ 28,819
Adjustment to reflect adoption of ASU 2016-13						$ (56,704)	$ (276)
Provision for unfunded commitments	68,449	4,668	105,496	8,076
Ending balance, Allowance	208,793	$ 31,793	208,793	$ 31,793
Unfunded Loan Commitments
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance, Allowance	17,791		1,077
Adjustment to reflect adoption of ASU 2016-13					$ 0	$ 12,714
Provision for unfunded commitments	19,712		23,712
Ending balance, Allowance	$ 37,503		$ 37,503