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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Non Traditional Mortgages Portfolio (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 7,451,573 | $ 7,251,480
Consumer | NTM Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 717,600 | 635,300
Consumer | NTM Loans | Green |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 10,200 | $ 21,500
Consumer | NTM Loans | First Mortgage | Debt-to-Value Ratio, Less than 80 Percent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 717,600 |
Consumer | NTM Loans | First Mortgage | Green | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 10,200 |
Consumer | NTM Loans | First Mortgage | Green | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio | FICO Score, Greater than 700 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 6,400 |
Percentage to total loans and leases (percent) | 63.00% |

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