BUSINESS AND BASIS OF PRESENTATION (Impact of adopting ASC 326) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 21,083	$ 17,174	$ 13,905	$ 14,120	$ 14,210
Allowance for Credit Losses on Off-Balance Sheet Credit Exposures	1,000	815	157
Impact of Adoption of ASC 326 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss			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	2,247	2,163	1,675	1,630	1,434
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	1,239	672	370	381	280
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	5,828	4,874	3,416	3,993	4,181
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	6,005	4,371	3,128	3,186	3,400
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	2,701	2,598	2,224	2,261	2,301
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	$ 3,063	$ 2,496	3,092	$ 2,669	$ 2,614
Consumer [Member] | Impact of Adoption of ASC 326 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss			$ (596)