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LOANS AND ALLOWANCE FOR LOAN LOSSES - Non Traditional Mortgages Portfolio (Detail) $ in Thousands | 9 Months Ended | 12 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] |  |  |
Count | loan | 501 | 628 |
Total loans | $ 653,475 | $ 826,731 |
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 | Loan Portfolio Concentration Risk | Loan Portfolio |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Concentration risk percentage (percent) | 10.20% | 10.70% |
Consumer | NTM Loans | Interest Only Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | $ 588,600 | $ 753,100 |
Consumer | NTM Loans | Green Loans (HELOC) - first liens |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Count | loan | 494 | 618 |
Total loans | $ 651,167 | $ 824,318 |
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) | 99.60% | 99.70% |
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Green Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Count | loan | 76 | 88 |
Total loans | $ 59,538 | $ 67,729 |
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) | 9.10% | 8.20% |
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Interest Only Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Count | loan | 409 | 519 |
Total loans | $ 588,567 | $ 753,061 |
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) | 90.10% | 91.10% |
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Negative amortization |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Count | loan | 9 | 11 |
Total loans | $ 3,062 | $ 3,528 |
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) | 0.50% | 0.40% |
Consumer | NTM Loans | Green Loans (HELOC) - second liens |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Count | loan | 7 | 10 |
Total loans | $ 2,308 | $ 2,413 |
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) | 0.40% | 0.30% |
Consumer | NTM Loans | Green Loans (HELOC) - second liens | Green Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Count | loan | 7 | 10 |
Total loans | $ 2,308 | $ 2,413 |
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) | 0.40% | 0.30% |

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