ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Amortized Cost Basis of Each Class of Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Combination Principal Forgiveness, Interest Rate Reduction and Term Extension	$ 2,931	$ 4,527
Percentage of loans receivable	0.06%	0.09%
Interest Rate Reduction
Financing Receivable, Allowance for Credit Loss [Line Items]
Combination Principal Forgiveness, Interest Rate Reduction and Term Extension	$ 2,000	$ 2,000
Combination Interest Rate Reduction and Term Extension
Financing Receivable, Allowance for Credit Loss [Line Items]
Combination Principal Forgiveness, Interest Rate Reduction and Term Extension	931	931
Combination Principal Forgiveness, Interest Rate Reduction and Term Extension
Financing Receivable, Allowance for Credit Loss [Line Items]
Combination Principal Forgiveness, Interest Rate Reduction and Term Extension	0	1,596
Commercial and Industrial Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Combination Principal Forgiveness, Interest Rate Reduction and Term Extension	$ 2,931	$ 4,527
Percentage of loans receivable	0.21%	0.32%
Commercial and Industrial Loans | Interest Rate Reduction
Financing Receivable, Allowance for Credit Loss [Line Items]
Combination Principal Forgiveness, Interest Rate Reduction and Term Extension	$ 2,000	$ 2,000
Commercial and Industrial Loans | Combination Interest Rate Reduction and Term Extension
Financing Receivable, Allowance for Credit Loss [Line Items]
Combination Principal Forgiveness, Interest Rate Reduction and Term Extension	931	931
Commercial and Industrial Loans | Combination Principal Forgiveness, Interest Rate Reduction and Term Extension
Financing Receivable, Allowance for Credit Loss [Line Items]
Combination Principal Forgiveness, Interest Rate Reduction and Term Extension	0	1,596
Commercial and Industrial Loans | Working capital lines of credit loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Combination Principal Forgiveness, Interest Rate Reduction and Term Extension	$ 2,931	$ 2,931
Percentage of loans receivable	0.50%	0.50%
Commercial and Industrial Loans | Working capital lines of credit loans | Interest Rate Reduction
Financing Receivable, Allowance for Credit Loss [Line Items]
Combination Principal Forgiveness, Interest Rate Reduction and Term Extension	$ 2,000	$ 2,000
Commercial and Industrial Loans | Working capital lines of credit loans | Combination Interest Rate Reduction and Term Extension
Financing Receivable, Allowance for Credit Loss [Line Items]
Combination Principal Forgiveness, Interest Rate Reduction and Term Extension	931	931
Commercial and Industrial Loans | Working capital lines of credit loans | Combination Principal Forgiveness, Interest Rate Reduction and Term Extension
Financing Receivable, Allowance for Credit Loss [Line Items]
Combination Principal Forgiveness, Interest Rate Reduction and Term Extension	$ 0	$ 0
Percentage of loans receivable	0.50%	0.50%
Commercial and Industrial Loans | Non-working capital loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Combination Principal Forgiveness, Interest Rate Reduction and Term Extension	$ 0	$ 1,596
Percentage of loans receivable	0.00%	0.20%
Commercial and Industrial Loans | Non-working capital loans | Interest Rate Reduction
Financing Receivable, Allowance for Credit Loss [Line Items]
Combination Principal Forgiveness, Interest Rate Reduction and Term Extension	$ 0	$ 0
Commercial and Industrial Loans | Non-working capital loans | Combination Interest Rate Reduction and Term Extension
Financing Receivable, Allowance for Credit Loss [Line Items]
Combination Principal Forgiveness, Interest Rate Reduction and Term Extension	0	0
Commercial and Industrial Loans | Non-working capital loans | Combination Principal Forgiveness, Interest Rate Reduction and Term Extension
Financing Receivable, Allowance for Credit Loss [Line Items]
Combination Principal Forgiveness, Interest Rate Reduction and Term Extension	$ 0	$ 1,596
Percentage of loans receivable	0.00%	0.20%