ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY - Loans By Class Modified As Troubled Debt Restructuring (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Modified Repayment Terms
Financing Receivable, Modifications
Number of Loans	4	1	12
Extension period for modified repayment terms	0 months
Modified Repayment Terms | Minimum
Financing Receivable, Modifications
Extension period for modified repayment terms		0 months	0 months
Modified Repayment Terms | Maximum
Financing Receivable, Modifications
Extension period for modified repayment terms			239 months
All Modifications [Member]
Financing Receivable, Modifications
Number of Loans	4	1	12
Pre-Modification Outstanding Recorded Investment	$ 6,066	$ 35	$ 7,183
Post-Modification Outstanding Recorded Investment	$ 5,533	$ 35	$ 7,182
Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member] | Modified Repayment Terms
Financing Receivable, Modifications
Number of Loans	1	1	1
Extension period for modified repayment terms	0 months	1 month	0 months
Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member] | All Modifications [Member]
Financing Receivable, Modifications
Number of Loans	1	1	1
Pre-Modification Outstanding Recorded Investment	$ 250	$ 35	$ 600
Post-Modification Outstanding Recorded Investment	$ 315	$ 35	$ 600
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member] | Modified Repayment Terms
Financing Receivable, Modifications
Number of Loans	2
Extension period for modified repayment terms	0 months
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member] | Modified Repayment Terms | Minimum
Financing Receivable, Modifications
Extension period for modified repayment terms			0 months
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member] | Modified Repayment Terms | Maximum
Financing Receivable, Modifications
Extension period for modified repayment terms			6 months
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member] | All Modifications [Member]
Financing Receivable, Modifications
Number of Loans	2		7
Pre-Modification Outstanding Recorded Investment	$ 4,288		$ 4,628
Post-Modification Outstanding Recorded Investment	$ 3,691		$ 4,628
Commercial Real Estate and Multi-family Residential Loans | Construction and Land Development Loans [Member] | Modified Repayment Terms
Financing Receivable, Modifications
Number of Loans			1
Extension period for modified repayment terms			12 months
Commercial Real Estate and Multi-family Residential Loans | Construction and Land Development Loans [Member] | All Modifications [Member]
Financing Receivable, Modifications
Number of Loans			1
Pre-Modification Outstanding Recorded Investment			$ 824
Post-Modification Outstanding Recorded Investment			$ 824
Commercial Real Estate and Multi-family Residential Loans | Owner Occupied Loans [Member] | Modified Repayment Terms
Financing Receivable, Modifications
Number of Loans	1		2
Extension period for modified repayment terms	0 months		12 months
Commercial Real Estate and Multi-family Residential Loans | Owner Occupied Loans [Member] | All Modifications [Member]
Financing Receivable, Modifications
Number of Loans	1		2
Pre-Modification Outstanding Recorded Investment	$ 1,528		$ 933
Post-Modification Outstanding Recorded Investment	$ 1,527		$ 933
Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member] | Modified Repayment Terms
Financing Receivable, Modifications
Number of Loans			1
Extension period for modified repayment terms			239 months
Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member] | All Modifications [Member]
Financing Receivable, Modifications
Number of Loans			1
Pre-Modification Outstanding Recorded Investment			$ 198
Post-Modification Outstanding Recorded Investment			$ 197