BUSINESS AND BASIS OF PRESENTATION (Impact of adopting ASC 326) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 23,137	$ 22,457	$ 17,174	$ 13,905
Allowance for Credit Losses on Off-Balance Sheet Credit Exposures	1,467	1,033	815	157	$ 155	$ 156	$ 160
Impact of Adoption of ASC 326 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss			3,300	3,269
Allowance for Credit Losses on Off-Balance Sheet Credit Exposures				658
Commercial, Financial and Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss	2,210	2,468	2,163	1,675
Allowance for Credit Losses on Off-Balance Sheet Credit Exposures				488
Commercial, Financial and Agricultural [Member] | Impact of Adoption of ASC 326 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss				488
Real Estate - Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss	2,116	1,955	672	370
Real Estate - Construction [Member] | Impact of Adoption of ASC 326 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss				302
Real Estate - Commercial Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss	7,269	6,640	4,874	3,416
Real Estate - Commercial Mortgage [Member] | Impact of Adoption of ASC 326 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss				1,458
Real Estate - Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss	5,130	5,440	4,371	3,128
Real Estate - Residential [Member] | Impact of Adoption of ASC 326 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss				1,243
Real Estate - Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss	2,932	2,753	2,598	2,224
Real Estate - Home Equity [Member] | Impact of Adoption of ASC 326 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss				374
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 3,480	$ 3,201	$ 2,496	3,092
Consumer [Member] | Impact of Adoption of ASC 326 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss				$ (596)