INVESTMENT SECURITIES - Securities with unrealized losses (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value		$ 1,553	$ 35,983
Less than 12 months, Unrealized Losses		(54)	(238)
12 months or Longer, Fair Value		590	6,797
12 months or Longer, Unrealized Losses		(19)	(171)
Total Fair Value		2,143	42,780
Total Unrealized Losses		(73)	(409)
Sales	$ 7,506
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)
Securities issued by U.S. government sponsored entities and agencies
Debt Securities, Available-for-sale [Line Items]
Sales	7,500
Realized gains	$ 100
Corporate collateralized mortgage obligations ("CMO") and mortgage-backed securities ("MBS")
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value		1,553	7,780
Less than 12 months, Unrealized Losses		(54)	(45)
12 months or Longer, Fair Value		590
12 months or Longer, Unrealized Losses		(19)
Total Fair Value		2,143	7,780
Total Unrealized Losses		$ (73)	$ (45)