INVESTMENT SECURITIES - Securities with unrealized losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	$ 4,369	$ 35,983
Less than 12 months, Unrealized Losses	(51)	(238)
12 months or Longer, Fair Value	566	6,797
12 months or Longer, Unrealized Losses	(13)	(171)
Total Fair Value	4,935	42,780
Total Unrealized Losses	(64)	(409)
Sales	0	7,506
Realized gains		100
Realized losses		0
Association ("GNMA") mortgage-backed securities - residential
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value		28,203
Less than 12 months, Unrealized Losses		(193)
12 months or Longer, Fair Value		4,450
12 months or Longer, Unrealized Losses		(142)
Total Fair Value		32,653
Total Unrealized Losses		(335)
Federal National Mortgage Association ("FNMA") mortgage-backed securities - residential
Debt Securities, Available-for-sale [Line Items]
12 months or Longer, Fair Value		2,347
12 months or Longer, Unrealized Losses		(29)
Total Fair Value		2,347
Total Unrealized Losses		(29)
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	3,489
Less than 12 months, Unrealized Losses	(11)
Total Fair Value	3,489
Total Unrealized Losses	(11)
Corporate collateralized mortgage obligations ("CMO") and mortgage-backed securities ("MBS")
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	880	7,780
Less than 12 months, Unrealized Losses	(40)	(45)
12 months or Longer, Fair Value	566
12 months or Longer, Unrealized Losses	(13)
Total Fair Value	1,446	7,780
Total Unrealized Losses	$ (53)	$ (45)