INVESTMENT SECURITIES - Available for Sale Securities in Unrealized Loss Position (Details) $ in Thousands	Dec. 31, 2020 USD ($) security	Dec. 31, 2019 USD ($) security
Schedule of Held-to-maturity Securities [Line Items]
Available-for-sale securities, Less than 12 months	$ 128,889	$ 161,496
Available-for-sale securities, 12 months or longer	5,411	187,043
Available-for-sale securities, Total	134,300	348,539
Available-for-sale securities, Unrealized losses
Available-for-sale securities, Less than 12 months	(530)	(1,146)
Available-for-sale securities, 12 months or longer	(95)	(2,472)
Available-for-sale securities, Total	$ (625)	$ (3,618)
Available-for-sale securities, Number of securities | security	43	91
Held-to-maturity securities, Fair value
Held-to-maturity securities, Less than 12 months		$ 10,328
Held-to-maturity securities, 12 months or longer		30,451
Held-to-maturity securities, Total		40,779
Held-to-maturity securities, Unrealized losses
Held-to-maturity securities, Less than 12 months		(11)
Held-to-maturity securities, 12 months or longer		(305)
Held-to-maturity securities, Total		$ (316)
Held-to-maturity securities, Number of securities | security		14
U.S. government and agencies
Schedule of Held-to-maturity Securities [Line Items]
Available-for-sale securities, Less than 12 months		$ 9,899
Available-for-sale securities, 12 months or longer		0
Available-for-sale securities, Total		9,899
Available-for-sale securities, Unrealized losses
Available-for-sale securities, Less than 12 months		(57)
Available-for-sale securities, 12 months or longer		0
Available-for-sale securities, Total		$ (57)
Available-for-sale securities, Number of securities | security		1
Government-sponsored entities
Schedule of Held-to-maturity Securities [Line Items]
Available-for-sale securities, Less than 12 months		$ 1,725
Available-for-sale securities, 12 months or longer		0
Available-for-sale securities, Total		1,725
Available-for-sale securities, Unrealized losses
Available-for-sale securities, Less than 12 months		0
Available-for-sale securities, 12 months or longer		0
Available-for-sale securities, Total		$ 0
Available-for-sale securities, Number of securities | security		1
Municipal bonds
Schedule of Held-to-maturity Securities [Line Items]
Available-for-sale securities, Less than 12 months	$ 2,344	$ 9,149
Available-for-sale securities, 12 months or longer	0	0
Available-for-sale securities, Total	2,344	9,149
Available-for-sale securities, Unrealized losses
Available-for-sale securities, Less than 12 months	(11)	(73)
Available-for-sale securities, 12 months or longer	0	0
Available-for-sale securities, Total	$ (11)	$ (73)
Available-for-sale securities, Number of securities | security	2	4
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Available-for-sale securities, Less than 12 months	$ 126,545	$ 140,723
Available-for-sale securities, 12 months or longer	5,411	187,043
Available-for-sale securities, Total	131,956	327,766
Available-for-sale securities, Unrealized losses
Available-for-sale securities, Less than 12 months	(519)	(1,016)
Available-for-sale securities, 12 months or longer	(95)	(2,472)
Available-for-sale securities, Total	$ (614)	$ (3,488)
Available-for-sale securities, Number of securities | security	41	85
Held-to-maturity securities, Fair value
Held-to-maturity securities, Less than 12 months		$ 10,328
Held-to-maturity securities, 12 months or longer		30,451
Held-to-maturity securities, Total		40,779
Held-to-maturity securities, Unrealized losses
Held-to-maturity securities, Less than 12 months		(11)
Held-to-maturity securities, 12 months or longer		(305)
Held-to-maturity securities, Total		$ (316)
Held-to-maturity securities, Number of securities | security		14