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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, 2021 USD ($) loan | Dec. 31, 2020 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 5,764,401 | $ 5,898,405
NTM Loans | Loan Portfolio Concentration Risk | Loan Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage (percent) | 7.10% | 7.40%
Consumer | NTM Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 320 | 344
Total loans | $ 412,136 | $ 437,113
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 | 315 | 339
Total loans | $ 410,530 | $ 435,515
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% | 99.60%
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Green Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 46 | 48
Total loans | $ 30,293 | $ 31,587
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) | 7.40% | 7.20%
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Interest Only Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 263 | 283
Total loans | $ 378,088 | $ 401,640
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) | 91.70% | 91.90%
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Negative amortization |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 6 | 8
Total loans | $ 2,149 | $ 2,288
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% | 0.50%
Consumer | NTM Loans | Green Loans (HELOC) - second liens |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 5 | 5
Total loans | $ 1,606 | $ 1,598
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% | 0.40%
Consumer | NTM Loans | Green Loans (HELOC) - second liens | Green Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 5 | 5
Total loans | $ 1,606 | $ 1,598
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% | 0.40%

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