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LOANS AND ALLOWANCE FOR LOAN LOSSES - Non Traditional Mortgage Loans Additional Information (Details) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan | Sep. 30, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | $ 6,383,259 | $ 7,700,873 | $ 7,253,293
NTM Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 6,383,259 | 7,700,873 |
Consumer | NTM Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | $ 653,475 | 826,731 |
Consumer | NTM Loans | Green Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest only notes balloon payment period | 15 years |  |
Consumer | NTM Loans | Interest Only Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | $ 588,600 | 753,100 |
Non-performing loans | Consumer | NTM Loans | Green Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 286 | 0 |
Green Loans (HELOC) - first liens | Consumer | NTM Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 651,167 | 824,318 |
Green Loans (HELOC) - first liens | Consumer | NTM Loans | Green Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 59,538 | 67,729 |
Green Loans (HELOC) - first liens | Consumer | NTM Loans | Interest Only Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 588,567 | 753,061 |
Green Loans (HELOC) - first liens | Consumer | NTM Loans | Negative amortization |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | $ 3,062 | $ 3,528 |
Number of nonperforming loans with negative amortization | loan | 0 | 0 |
Green Loans (HELOC) - first liens | Non-performing loans | Consumer | NTM Loans | Interest Only Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | $ 827 | $ 0 |

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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 + Details
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