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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgages Portfolio (Detail) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) Loan | Dec. 31, 2017 USD ($) Loan | Sep. 30, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 7,253,293 | $ 6,659,407 | $ 6,226,897
NTM Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 834,301 | $ 806,933 |
Consumer | NTM Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Count | Loan | 630 | 592 |
Loans | $ 834,301 | $ 806,933 |
Consumer | NTM Loans | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Concentration risk percentage | 100.00% | 100.00% |
Consumer | NTM Loans | Loan Portfolio Concentration Risk | Loan Portfolio |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Concentration risk percentage | 11.50% | 12.10% |
Consumer | NTM Loans | Green Loans (HELOC) - first liens |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Count | Loan | 619 | 580 |
Loans | $ 831,169 | $ 803,355 |
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 | 99.60% | 99.60% |
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Green Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Count | Loan | 91 | 101 |
Loans | $ 70,470 | $ 82,197 |
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 | 8.40% | 10.20% |
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Interest Only Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Count | Loan | 517 | 468 |
Loans | $ 757,135 | $ 717,484 |
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 | 90.80% | 88.90% |
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Negative amortization |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Count | Loan | 11 | 11 |
Loans | $ 3,564 | $ 3,674 |
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 | 0.40% | 0.50% |
Consumer | NTM Loans | Green Loans (HELOC) - second liens |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Count | Loan | 11 | 12 |
Loans | $ 3,132 | $ 3,578 |
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 | 0.40% | 0.40% |
Consumer | NTM Loans | Green Loans (HELOC) - second liens | Green Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Count | Loan | 11 | 12 |
Loans | $ 3,132 | $ 3,578 |
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 | 0.40% | 0.40% |

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