INVESTMENT SECURITIES - Schedule of Gross Unrealized Losses and Fair Value of Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Estimated Fair Value
Less than 12 months, estimated fair value	$ 50,456	$ 131,176
12 months or more, estimated fair value	4,204	57,151
Total estimated fair value	54,660	188,327
Unrealized Losses
Less than 12 months, unrealized losses	(223)	(705)
12 months or more, unrealized losses	(113)	(591)
Total unrealized losses	(336)	(1,296)
State, county and municipal securities
Estimated Fair Value
Less than 12 months, estimated fair value		803
12 months or more, estimated fair value		0
Total estimated fair value		803
Unrealized Losses
Less than 12 months, unrealized losses		(2)
12 months or more, unrealized losses		0
Total unrealized losses		(2)
Corporate debt securities
Estimated Fair Value
Less than 12 months, estimated fair value	16,932	2,573
12 months or more, estimated fair value	0	0
Total estimated fair value	16,932	2,573
Unrealized Losses
Less than 12 months, unrealized losses	(68)	(2)
12 months or more, unrealized losses	0	0
Total unrealized losses	(68)	(2)
SBA pool securities
Estimated Fair Value
Less than 12 months, estimated fair value	250	28,521
12 months or more, estimated fair value	4,202	4,825
Total estimated fair value	4,452	33,346
Unrealized Losses
Less than 12 months, unrealized losses	(1)	(285)
12 months or more, unrealized losses	(113)	(124)
Total unrealized losses	(114)	(409)
Mortgage-backed securities
Estimated Fair Value
Less than 12 months, estimated fair value	33,274	99,279
12 months or more, estimated fair value	2	52,326
Total estimated fair value	33,276	151,605
Unrealized Losses
Less than 12 months, unrealized losses	(154)	(416)
12 months or more, unrealized losses	0	(467)
Total unrealized losses	$ (154)	$ (883)