SUBORDINATED DEBT - Additional Information (Details) - Subordinated Debt [Member] - USD ($)	1 Months Ended
	Dec. 31, 2020	Dec. 31, 2017	Jun. 30, 2016
Debt Instrument [Line Items]
Principal amount	$ 100,000,000.0	$ 35,000,000.0	$ 50,000,000.0
Non-callable term	5 years	5 years	5 years
Notes maturity date	Dec. 22, 2030	Dec. 15, 2027	Jun. 30, 2026
Fixed interest rate	3.50%	4.75%	6.00%
LIBOR spread	3.26%	2.54%	4.85%
Debt issuance costs	$ 1,800,000	$ 875,000	$ 1,300,000
Parent Company [Member]
Debt Instrument [Line Items]
Net proceeds used to contribute to the Bank		29,100,000	40,000,000.0
Proceeds from debt retained by parent		$ 5,000,000	$ 10,000,000