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LOANS AND ALLOWANCE FOR LOAN LOSSES - Non Traditional Mortgage Loans Additional Information (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 5,951,885 | $ 7,700,873
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 | $ 600,656 | $ 826,731
NTM Loans | Loan Portfolio | Loan Portfolio Concentration Risk |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases (percent) | 10.10% | 10.70%
NTM Loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 600,656 | $ 826,731
Increase (decrease) in loans receivable | $ (226,100) |
Increase (decrease) in loans receivable (percent) | (27.30%) |
NTM Loans | Consumer | First lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 598,357 | 824,318
NTM Loans | Consumer | Green Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 52,300 | 70,100
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 | $ 49,959 | 67,729
Increase (decrease) in loans receivable | (17,770) |
NTM Loans | Consumer | Green Loans | Nonperforming Financing Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 1,500 | 0
NTM Loans | Consumer | Interest only |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 545,400 | 753,100
NTM Loans | Consumer | Interest only | First lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 545,371 | 753,061
NTM Loans | Consumer | Interest only | Nonperforming Financing Receivables | First lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 11,500 | 0
NTM Loans | Consumer | Negative amortization |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 3,000 | 3,500
NTM Loans | Consumer | Negative amortization | First lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 3,027 | $ 3,528
Number of non-performing loans | loan | 0 | 0

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