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ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Additional Information (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) loan | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) borrower loan | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Loan amount of credit quality analysis |  |  | $ 250,000 |  |
Loans receivable before allowance for credit loss | $ 4,353,709,000 |  | 4,353,709,000 |  |
Loans modified In troubled debt restructured loans |  | $ 2,400,000 |  | $ 2,400,000 |
Increase in allowance for loan loss |  | 2,300,000 |  |  |
Charge-offs recorded for new troubled debt restructurings |  | $ 0 |  | $ 666,000 |
Financing receivable, loan portfolio, deferrals, COVID-19 |  |  | $ 36,900,000 |  |
Financing receivable, loan portfolio, deferrals, COVID-19, percentage of loan portfolio (as a percent) |  |  | 0.80% |  |
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 | $ 194,200,000 |  | $ 194,200,000 |  |
Total consumer loans |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Loans modified In troubled debt restructured loans | $ 5,800,000 |  | $ 5,800,000 |  |
Loans modified In troubled debt restructured loans |  |  |  |  | $ 5,500,000
Number of loans modified as troubled debt restructurings | loan | 0 |  | 0 |  |
Financing receivable, loan portfolio, deferrals, COVID-19, borrowers | borrower |  |  | 0 |  |
Total commercial loans |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Financing receivable, loan portfolio, deferrals, COVID-19, borrowers | borrower |  |  | 8 |  |
Loans under first deferral action |  |  | $ 14,200,000 |  |
Loans under second deferral action |  |  | 253,000 |  |
Loans under third deferral action |  |  | 20,000,000.0 |  |
Loans under fourth deferral action |  |  | $ 2,500,000 |  |
Borrowers percentage |  |  | 0.64 |  |

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