COMMITMENTS AND CONTINGENCIES - Narrative (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
Operating Leased Assets [Line Items]
Rent expense for operating leases	$ 1,100	$ 1,300	$ 3,200	$ 4,000
Sublease income	185	$ 167	558	$ 533
Cash balances held at other institutions that exceed FDIC insured limits	26,600		26,600		$ 25,700
Restricted cash	$ 11,900		$ 11,900		2,800
Operating Lease Arrangement Type One
Operating Leased Assets [Line Items]
Renewal term	3 years		3 years
Operating Lease Arrangement Type Two
Operating Leased Assets [Line Items]
Renewal term	5 years		5 years
Operating Lease Arrangement Type Three
Operating Leased Assets [Line Items]
Renewal term	10 years		10 years
Commitments to Extend Credit
Operating Leased Assets [Line Items]
Real estate loan funding commitments	$ 124,100		$ 124,100		103,200
Unfunded Loan Commitment
Operating Leased Assets [Line Items]
Reserve recorded on real estate loan funding commitments	$ 78		$ 78		$ 89