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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Non Traditional Mortgages Portfolio (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) loan | Dec. 31, 2020 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 6,228,575 | $ 5,898,405
NTM Loans | Loan Portfolio Concentration Risk | Loan Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage (percent) | 9.20% | 7.40%
Consumer | NTM Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 382 | 344
Loans receivable | $ 571,378 | $ 437,113
Consumer | NTM Loans | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage (percent) | 100.00% | 100.00%
Consumer | NTM Loans | Green Loans (HELOC) - first liens |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 377 | 339
Loans receivable | $ 569,781 | $ 435,515
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage (percent) | 99.70% | 99.60%
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Green Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 36 | 48
Loans receivable | $ 25,074 | $ 31,587
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Green Loans | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage (percent) | 4.40% | 7.20%
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Interest Only Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 337 | 283
Loans receivable | $ 543,243 | $ 401,640
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Interest Only Loans | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage (percent) | 95.10% | 91.90%
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Negative amortization |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 4 | 8
Loans receivable | $ 1,464 | $ 2,288
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Negative amortization | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage (percent) | 0.30% | 0.50%
Consumer | NTM Loans | Green Loans (HELOC) - second liens |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 5 | 5
Loans receivable | $ 1,597 | $ 1,598
Consumer | NTM Loans | Green Loans (HELOC) - second liens | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage (percent) | 0.30% | 0.40%
Consumer | NTM Loans | Green Loans (HELOC) - second liens | Green Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 5 | 5
Loans receivable | $ 1,597 | $ 1,598
Consumer | NTM Loans | Green Loans (HELOC) - second liens | Green Loans | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage (percent) | 0.30% | 0.40%

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