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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgage Loans Additional Information (Details) - USD ($) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 6,226,897,000 | $ 6,034,752,000 | $ 6,568,791,000
Percentage decrease in credit score to run exception report | 10.00% |  |
Non-Traditional Mortgages (NTM) |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 793,946,000 | 885,148,000 |
Consumer | Non-Traditional Mortgages (NTM) |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 793,946,000 | 885,148,000 |
Increase (decrease) in loans receivable | $ (91,200,000) |  |
Increase (decrease) in loans receivable, percentage | (10.30%) |  |
Consumer | Non-Traditional Mortgages (NTM) | Green Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 85,800,000 | 91,000,000 |
Interest only notes balloon payment period | 15 years |  |
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Nonperforming Financing Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 0 | 0 |
Consumer | Non-Traditional Mortgages (NTM) | Interest Only Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 704,400,000 | 784,400,000 |
Consumer | Non-Traditional Mortgages (NTM) | Interest Only Loans | Nonperforming Financing Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 1,200,000 | 467,000 |
Consumer | Non-Traditional Mortgages (NTM) | Negative amortization |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 3,700,000 | 9,800,000 |
Consumer | Non-Traditional Mortgages (NTM) | Negative amortization | Nonperforming Financing Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 0 | $ 0 |
Consumer | Non-Traditional Mortgages (NTM) | Loan Portfolio | Loan Portfolio Concentration Risk |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Concentration risk percentage | 12.80% | 14.70% |

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