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INVESTMENT SECURITIES - Cost basis and fair values of investment securities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Information concerning investments with unrealized losses
Investment securities available for sale, Cost Basis	$ 139,577	$ 148,514
Investment securities available for sale, Gross Unrealized Gains	2,564	765
Investment securities available for sale, Gross Unrealized Losses	(392)	(2,548)
Available for Sale, Fair Value, Total	141,749	146,731
Investment securities held to maturity, Cost Basis	39,936	40,760
Investment securities held to maturity, Gross Unrealized Gains	1,250	222
Investment securities held to maturity, Gross Unrealized Losses	(104)	(658)
Held to Maturity, Fair Value, Total	41,082	40,324
U.S. Agency
Information concerning investments with unrealized losses
Investment securities available for sale, Cost Basis	5,084	7,685
Investment securities available for sale, Gross Unrealized Gains	32	4
Investment securities available for sale, Gross Unrealized Losses		(160)
Available for Sale, Fair Value, Total	5,116	7,529
Municipal
Information concerning investments with unrealized losses
Investment securities available for sale, Cost Basis	14,678	13,301
Investment securities available for sale, Gross Unrealized Gains	509	114
Investment securities available for sale, Gross Unrealized Losses	(17)	(234)
Available for Sale, Fair Value, Total	15,170	13,181
Investment securities held to maturity, Cost Basis	24,438	24,740
Investment securities held to maturity, Gross Unrealized Gains	941	131
Investment securities held to maturity, Gross Unrealized Losses	(53)	(404)
Held to Maturity, Fair Value, Total	25,326	24,467
Corporate bonds [Member]
Information concerning investments with unrealized losses
Investment securities available for sale, Cost Basis	39,769	37,359
Investment securities available for sale, Gross Unrealized Gains	342	131
Investment securities available for sale, Gross Unrealized Losses	(281)	(996)
Available for Sale, Fair Value, Total	39,830	36,494
U.S. Agency mortgage-backed securities
Information concerning investments with unrealized losses
Investment securities available for sale, Cost Basis	80,046	90,169
Investment securities available for sale, Gross Unrealized Gains	1,681	516
Investment securities available for sale, Gross Unrealized Losses	(94)	(1,158)
Available for Sale, Fair Value, Total	81,633	89,527
Investment securities held to maturity, Cost Basis	9,466	9,983
Investment securities held to maturity, Gross Unrealized Gains	251	78
Investment securities held to maturity, Gross Unrealized Losses	(4)	(132)
Held to Maturity, Fair Value, Total	9,713	9,929
Corporate bonds and other securities [Member]
Information concerning investments with unrealized losses
Investment securities held to maturity, Cost Basis	6,032	6,037
Investment securities held to maturity, Gross Unrealized Gains	58	13
Investment securities held to maturity, Gross Unrealized Losses	(47)	(122)
Held to Maturity, Fair Value, Total	$ 6,043	$ 5,928

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