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RECENT ACCOUNTING PRONOUNCEMENTS (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
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss	$ (80,542)		$ (47,971)	$ (47,971)
Reserve for off-balance sheet credit exposures (included in other liabilities)	(4,604)		(1,272)	(1,272)	$ (1,431)	$ (1,897)	$ (1,242)
Accumulated deficit	$ 16,609		19,102	19,102
Other Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net deferred tax assets (included in other assets)			16,541
Commercial Financial And Agricultural
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(8,136)
Real Estate \| Construction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(1,792)
Real Estate \| Residential Mortgage
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(13,327)
Real Estate \| Home Equity
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(4,206)
Real Estate \| Commercial Mortgage
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(11,113)
Consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(9,397)
Adjusted balance at beginning of period
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(51,537)
Reserve for off-balance sheet credit exposures (included in other liabilities)		$ (4,383)	(2,012)	(2,012)
Accumulated deficit			22,257
Adjusted balance at beginning of period \| Other Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net deferred tax assets (included in other assets)			17,692
Adjusted balance at beginning of period \| Commercial Financial And Agricultural
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(7,509)
Adjusted balance at beginning of period \| Real Estate \| Construction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(2,271)
Adjusted balance at beginning of period \| Real Estate \| Residential Mortgage
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(13,935)
Adjusted balance at beginning of period \| Real Estate \| Home Equity
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(2,592)
Adjusted balance at beginning of period \| Real Estate \| Commercial Mortgage
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(13,737)
Adjusted balance at beginning of period \| Consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(11,493)
Impact of the adoption of new accounting standards
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(3,566)
Reserve for off-balance sheet credit exposures (included in other liabilities)			(740)	$ (740)
Accumulated deficit			3,155
Impact of the adoption of new accounting standards \| Other Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net deferred tax assets (included in other assets)			1,151
Impact of the adoption of new accounting standards \| Commercial Financial And Agricultural
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			627
Impact of the adoption of new accounting standards \| Real Estate \| Construction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(479)
Impact of the adoption of new accounting standards \| Real Estate \| Residential Mortgage
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(608)
Impact of the adoption of new accounting standards \| Real Estate \| Home Equity
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			1,614
Impact of the adoption of new accounting standards \| Real Estate \| Commercial Mortgage
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(2,624)
Impact of the adoption of new accounting standards \| Consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(2,096)
Accounting Standards Update 2016-13 [Member] \| Impact of the adoption of new accounting standards
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(3,600)
Net deferred tax assets (included in other assets)			1,100
Reserve for off-balance sheet credit exposures (included in other liabilities)			$ (700)