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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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