ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY - Loans By Class Modified As Troubled Debt Restructuring (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Modified Repayment Terms
Troubled Debt Restructurings Modified During Period [Abstract]
Number of Loans	1	12	8
Extension period for modified repayment terms	1 month
Modified Repayment Terms | Minimum
Troubled Debt Restructurings Modified During Period [Abstract]
Extension period for modified repayment terms		0 months	0 months
Modified Repayment Terms | Maximum
Troubled Debt Restructurings Modified During Period [Abstract]
Extension period for modified repayment terms		239 months	350 months
All Modifications
Troubled Debt Restructurings Modified During Period [Abstract]
Number of Loans	1	12	8
Pre-Modification Outstanding Recorded Investment	$ 35	$ 7,183	$ 3,852
Post-Modification Outstanding Recorded Investment	$ 35	$ 7,182	$ 3,854
Commercial and Industrial Loans | Working capital lines of credit loans | Modified Repayment Terms
Troubled Debt Restructurings Modified During Period [Abstract]
Number of Loans	1	1	1
Extension period for modified repayment terms	1 month	0 months	9 months
Commercial and Industrial Loans | Working capital lines of credit loans | All Modifications
Troubled Debt Restructurings Modified During Period [Abstract]
Number of Loans	1	1	1
Pre-Modification Outstanding Recorded Investment	$ 35	$ 600	$ 1,324
Post-Modification Outstanding Recorded Investment	$ 35	$ 600	$ 1,324
Commercial and Industrial Loans | Non-working capital loans | Modified Repayment Terms
Troubled Debt Restructurings Modified During Period [Abstract]
Number of Loans		7
Commercial and Industrial Loans | Non-working capital loans | Modified Repayment Terms | Minimum
Troubled Debt Restructurings Modified During Period [Abstract]
Extension period for modified repayment terms		0 months	0 months
Commercial and Industrial Loans | Non-working capital loans | Modified Repayment Terms | Maximum
Troubled Debt Restructurings Modified During Period [Abstract]
Extension period for modified repayment terms		6 months	6 months
Commercial and Industrial Loans | Non-working capital loans | All Modifications
Troubled Debt Restructurings Modified During Period [Abstract]
Number of Loans		7	4
Pre-Modification Outstanding Recorded Investment		$ 4,628	$ 1,922
Post-Modification Outstanding Recorded Investment		$ 4,628	$ 1,922
Commercial Real Estate and Multi-family Residential Loans | Owner occupied loans | Modified Repayment Terms
Troubled Debt Restructurings Modified During Period [Abstract]
Number of Loans		2	1
Extension period for modified repayment terms		12 months	6 months
Commercial Real Estate and Multi-family Residential Loans | Owner occupied loans | All Modifications
Troubled Debt Restructurings Modified During Period [Abstract]
Number of Loans		2	1
Pre-Modification Outstanding Recorded Investment		$ 933	$ 486
Post-Modification Outstanding Recorded Investment		$ 933	$ 486
Commercial Real Estate and Multi-family Residential Loans | Construction and land development loans | Modified Repayment Terms
Troubled Debt Restructurings Modified During Period [Abstract]
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 | All Modifications
Troubled Debt Restructurings Modified During Period [Abstract]
Number of Loans		1
Pre-Modification Outstanding Recorded Investment		$ 824
Post-Modification Outstanding Recorded Investment		$ 824
Consumer 1-4 Family Mortgage Loans | Closed end first mortgage loans | Modified Repayment Terms
Troubled Debt Restructurings Modified During Period [Abstract]
Number of Loans		1	2
Extension period for modified repayment terms		239 months
Consumer 1-4 Family Mortgage Loans | Closed end first mortgage loans | Modified Repayment Terms | Minimum
Troubled Debt Restructurings Modified During Period [Abstract]
Extension period for modified repayment terms			198 months
Consumer 1-4 Family Mortgage Loans | Closed end first mortgage loans | Modified Repayment Terms | Maximum
Troubled Debt Restructurings Modified During Period [Abstract]
Extension period for modified repayment terms			350 months
Consumer 1-4 Family Mortgage Loans | Closed end first mortgage loans | All Modifications
Troubled Debt Restructurings Modified During Period [Abstract]
Number of Loans		1	2
Pre-Modification Outstanding Recorded Investment		$ 198	$ 120
Post-Modification Outstanding Recorded Investment		$ 197	$ 122