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ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 loan	Sep. 30, 2021 USD ($) borrower loan	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan amount of credit quality analysis			$ 250
Loans receivable before allowance for credit loss	$ 4,239,453		4,239,453
Increase in allowance for loan loss				$ 2,400
Charge-offs recorded for new troubled debt restructurings				$ 666
Financing receivable, loan portfolio, deferrals, COVID-19			$ 22,300
Financing receivable, loan portfolio, deferrals, COVID-19, borrowers | borrower			3
Financing receivable, loan portfolio, deferrals, COVID-19, percentage of loan portfolio (as a percent)			0.50%
30-89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of loans past due | loan	0		0
PPP | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans receivable before allowance for credit loss	$ 91,900		$ 91,900
Total consumer loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans modified In troubled debt restructured loans	$ 6,100		$ 6,100		$ 5,500
Number of loans modified as troubled debt restructurings | loan	0	0	0
Financing receivable, loan portfolio, deferrals, COVID-19, borrowers | borrower			1
Total commercial loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, loan portfolio, deferrals, COVID-19, borrowers | borrower			2
Loans under second deferral action			$ 8,000
Loans under third deferral action			$ 14,300

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