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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Non Traditional Mortgages Portfolio (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 5,667,464 | $ 5,951,885
NTM Loans | Loan Portfolio Concentration Risk | Loan Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage (percent) | 9.90% | 10.10%
Consumer | NTM Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 428 | 461
Total loans | $ 560,058 | $ 600,656
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 | Green Loans (HELOC) - first liens |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 422 | 454
Total loans | $ 558,164 | $ 598,357
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) | 99.70% | 99.60%
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Green Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 65 | 69
Total loans | $ 45,913 | $ 49,959
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) | 8.20% | 8.30%
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Interest Only Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 349 | 376
Total loans | $ 509,892 | $ 545,371
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) | 91.00% | 90.80%
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Negative amortization |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 8 | 9
Total loans | $ 2,359 | $ 3,027
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) | 0.40% | 0.50%
Consumer | NTM Loans | Green Loans (HELOC) - second liens |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 6 | 7
Total loans | $ 1,894 | $ 2,299
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) | 0.30% | 0.40%
Consumer | NTM Loans | Green Loans (HELOC) - second liens | Green Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 6 | 7
Total loans | $ 1,894 | $ 2,299
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) | 0.30% | 0.40%

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