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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Non Traditional Mortgage Loans Additional Information (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 5,898,405 | $ 5,951,885
FICOR score decrease (percent) | 10.00% |
Loan Portfolio | Loan Portfolio Concentration Risk |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases (percent) | 100.00% | 100.00%
NTM Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 437,113 | $ 600,656
NTM Loans | Loan Portfolio | Loan Portfolio Concentration Risk |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases (percent) | 7.40% | 10.10%
NTM Loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 437,113 | $ 600,656
Increase (decrease) in loans receivable | $ (163,500) |
Increase (decrease) in loans receivable (percent) | (27.20%) |
NTM Loans | Consumer | First lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 435,515 | 598,357
NTM Loans | Consumer | Green Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 33,200 | 52,300
Interest only notes balloon payment period | 15 years |
NTM Loans | Consumer | Green Loans | First lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 31,587 | 49,959
NTM Loans | Consumer | Green Loans | Nonperforming Financing Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 4,000 | 1,500
NTM Loans | Consumer | Interest Only |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 401,600 | 545,400
NTM Loans | Consumer | Interest Only | First lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 401,640 | 545,371
NTM Loans | Consumer | Interest Only | Nonperforming Financing Receivables | First lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 4,700 | 11,500
NTM Loans | Consumer | Negative amortization |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 2,300 | 3,000
NTM Loans | Consumer | Negative amortization | First lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 2,288 | $ 3,027
Number of non-performing loans | loan | 0 | 0

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