SECURITIES - Amortized cost, related estimated fair value, and unrealized gains and losses (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Available-for-Sale Securities
Amortized Cost	$ 302,452	$ 272,585
Gross Unrealized Gains	14,828	6,336
Gross Unrealized Losses	(759)	(993)
Total	316,521	277,928
Other mortgage backed debt securities [Member]
Available-for-Sale Securities
Amortized Cost	35,102	11,145
Gross Unrealized Gains	102	3
Gross Unrealized Losses	(93)	(10)
Total	35,111	11,138
U.S. Treasury Securities [Member]
Available-for-Sale Securities
Amortized Cost	0	2,852
Gross Unrealized Gains	0	3
Gross Unrealized Losses	0	0
Total	0	2,855
Obligations of U.S. Government Corporations and Agencies Mortgage-backed [Member]
Available-for-Sale Securities
Amortized Cost	58,012	77,131
Gross Unrealized Gains	1,851	539
Gross Unrealized Losses	(74)	(387)
Total	59,789	77,283
Obligations of US Government Corporations and Agencies Other [Member]
Available-for-Sale Securities
Amortized Cost	11,221	10,381
Gross Unrealized Gains	3	4
Gross Unrealized Losses	(117)	(88)
Total	11,107	10,297
Obligations of state and political subdivisions [Member]
Available-for-Sale Securities
Amortized Cost	134,558	114,934
Gross Unrealized Gains	12,320	5,490
Gross Unrealized Losses	0	(48)
Total	146,878	120,376
Asset-backed Securities [Member]
Available-for-Sale Securities
Amortized Cost	41,717	37,596
Gross Unrealized Gains	79	115
Gross Unrealized Losses	(420)	(175)
Total	41,376	37,536
Corporate debt securities [Member]
Available-for-Sale Securities
Amortized Cost	21,842	18,546
Gross Unrealized Gains	473	182
Gross Unrealized Losses	(55)	(285)
Total	$ 22,260	$ 18,443