INVESTMENT SECURITIES (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Investment securities available-for-sale [Abstract]
Amortized cost	$ 461,803,000		$ 424,981,000
Unrealized gains	8,443,000		10,473,000
Unrealized losses	(4,200,000)		(374,000)
Estimated fair value	466,046,000		435,080,000
Proceeds from sales, calls and maturities of available-for-sale securities	9,393,000	$ 20,044,000
Gross realized gains from sales/calls of available-for-sale securities	25,000	84,000
Gross realized losses from sales/calls of available-for-sale securities	35,000	$ 46,000
U.S. Treasury Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	47,264,000		37,910,000
Unrealized gains	820,000		982,000
Unrealized losses	(155,000)		(1,000)
Estimated fair value	47,929,000		38,891,000
Securities of U.S. Government Agencies and Corporations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	106,427,000		105,506,000
Unrealized gains	934,000		1,317,000
Unrealized losses	(2,129,000)		(265,000)
Estimated fair value	105,232,000		106,558,000
Obligations of States and Political Subdivisions [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	29,891,000		31,013,000
Unrealized gains	1,407,000		1,878,000
Unrealized losses	(207,000)		(9,000)
Estimated fair value	31,091,000		32,882,000
Collateralized Mortgage Obligations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	74,735,000		71,531,000
Unrealized gains	1,796,000		1,937,000
Unrealized losses	(219,000)		(8,000)
Estimated fair value	76,312,000		73,460,000
Mortgage-backed Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	203,486,000		179,021,000
Unrealized gains	3,486,000		4,359,000
Unrealized losses	(1,490,000)		(91,000)
Estimated fair value	$ 205,482,000		$ 183,289,000