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INCOME TAXES - Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amount
Statutory Tax Rate									$ 8,505	$ 14,918	$ 7,283
Increase (Decrease) Resulting From:
State taxes, net of federal benefit									908	986	141
Tax exempt interest									(1,315)	(2,074)	(1,388)
Federal tax credits									(125)	(130)	0
Officers' life insurance									(382)	(538)	(244)
Acquisition Costs									0	89	289
Stock-based compensation plans									(120)	(241)	0
Impact of federal tax reform enactment									0	3,988	0
Other									91	(368)	(205)
Income Tax Expense (Benefit)	$ 1,426	$ 2,076	$ 2,123	$ 1,937	$ 8,545	$ 3,575	$ 3,029	$ 1,481	$ 7,562	$ 16,630	$ 5,876
Rate
Statutory Tax Rate									21.00%	35.00%	35.00%
Increase (Decrease) Resulting From:
State taxes, net of federal benefit									2.24%	2.31%	0.68%
Tax exempt interest									(3.25%)	(4.87%)	(6.67%)
Federal tax credits									(0.31%)	(0.30%)	(0.00%)
Officers' life insurance									(0.94%)	(1.26%)	(1.17%)
Acquisition Costs									0.00%	0.21%	1.39%
Stock-based compensation plans									(0.30%)	(0.57%)	0.00%
Impact of federal tax reform enactment									0.00%	9.36%	0.00%
Other									0.23%	(0.86%)	(0.99%)
Effective Tax Rate									18.67%	39.02%	28.24%

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