INVESTMENT SECURITIES (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Investment securities available-for-sale [Abstract]
Amortized cost	$ 324,955,000		$ 324,955,000		$ 340,706,000
Unrealized gains	11,043,000		11,043,000		3,131,000
Unrealized losses	0		0		(940,000)
Estimated fair value	335,998,000		335,998,000		342,897,000
Proceeds from sales, calls and maturities of available-for-sale securities	12,000,000	$ 15,683,000	32,044,000	$ 32,683,000
Gross realized gains from sales/calls of available-for-sale securities	4,000	47,000	88,000	47,000
Gross realized losses from sales/calls of available-for-sale securities	0	$ (53,000)	(46,000)	$ (53,000)
U.S. Treasury Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	34,723,000		34,723,000		42,667,000
Unrealized gains	1,280,000		1,280,000		601,000
Unrealized losses	0		0		(13,000)
Estimated fair value	36,003,000		36,003,000		43,255,000
Securities of U.S. Government Agencies and Corporations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	41,393,000		41,393,000		53,525,000
Unrealized gains	1,350,000		1,350,000		433,000
Unrealized losses	0		0		(46,000)
Estimated fair value	42,743,000		42,743,000		53,912,000
Obligations of States and Political Subdivisions [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	28,916,000		28,916,000		26,311,000
Unrealized gains	1,809,000		1,809,000		749,000
Unrealized losses	0		0		(29,000)
Estimated fair value	30,725,000		30,725,000		27,031,000
Collateralized Mortgage Obligations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	82,235,000		82,235,000		79,470,000
Unrealized gains	2,279,000		2,279,000		349,000
Unrealized losses	0		0		(399,000)
Estimated fair value	84,514,000		84,514,000		79,420,000
Mortgage-backed Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	137,688,000		137,688,000		138,733,000
Unrealized gains	4,325,000		4,325,000		999,000
Unrealized losses	0		0		(453,000)
Estimated fair value	$ 142,013,000		$ 142,013,000		$ 139,279,000