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INCOME TAXES - Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amount
Statutory tax rate									$ 8,747	$ 5,633	$ 8,505
Increase (decrease) resulting from:
State taxes, net of federal benefit									1,120	547	908
Tax exempt interest									(1,301)	(1,375)	(1,315)
Federal tax credits									(330)	(282)	(125)
Officers' life insurance									(403)	(431)	(382)
Gain of disposal of low income housing tax credit investments									147
Stock-based compensation plans									52	(20)	(120)
Other									375	137	91
Income Tax Expense (Benefit), Total	$ 2,269	$ 2,146	$ 2,199	$ 1,793	$ 362	$ 780	$ 1,364	$ 1,703	$ 8,407	$ 4,209	$ 7,562
Rate
Statutory tax rate									21.00%	21.00%	21.00%
Increase (decrease) resulting from:
State taxes, net of federal benefit									2.69%	2.04%	2.24%
Tax exempt interest									(3.12%)	(5.13%)	(3.25%)
Federal tax credits									(0.79%)	(1.05%)	(0.31%)
Officers' life insurance									(0.97%)	(1.61%)	(0.94%)
Gain of Disposal of LIHTC Investments									0.35%
Stock-based compensation plans									0.12%	(0.07%)	(0.30%)
Other									0.90%	0.51%	0.23%
Effective tax rate									20.18%	15.69%	18.67%

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