VARIABLE INTEREST ENTITIES - Schedule of the Fair Value of OBX Trusts Closed (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Oct. 31, 2019	Jul. 31, 2019	Jun. 30, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Mar. 31, 2018
Variable Interest Entity [Line Items]
Loans	$ 669,713
OBX Trust | Consolidated VIEs
Variable Interest Entity [Line Items]
Loans		$ 465,492	$ 463,405	$ 383,760	$ 388,156	$ 393,961	$ 384,027	$ 383,451	$ 327,162