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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgages Portfolio (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) Loan | Dec. 31, 2016 USD ($) Loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans and leases | $ 6,659,407 | $ 6,034,752
Loan Portfolio Concentration Risk | Loan Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases | 100.00% | 100.00%
NTM Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans and leases | $ 806,933 | $ 885,148
NTM Loans | Loan Portfolio Concentration Risk | Loan Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases | 12.10% | 14.70%
Consumer | NTM Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | Loan | 592 | 663
Total loans and leases | $ 806,933 | $ 885,148
Consumer | NTM Loans | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases | 100.00% | 100.00%
Consumer | NTM Loans | Loan Portfolio Concentration Risk | Loan Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases | 12.10% | 14.70%
Consumer | NTM Loans | First lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | Loan | 580 | 651
Total loans and leases | $ 803,355 | $ 881,589
Consumer | NTM Loans | First lien | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases | 99.60% | 99.60%
Consumer | NTM Loans | Second lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | Loan | 12 | 12
Total loans and leases | $ 3,578 | $ 3,559
Consumer | NTM Loans | Second lien | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases | 0.40% | 0.40%
Consumer | NTM Loans | Green Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans and leases | $ 85,800 | $ 91,000
Consumer | NTM Loans | Green Loans | First lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | Loan | 101 | 107
Total loans and leases | $ 82,197 | $ 87,469
Consumer | NTM Loans | Green Loans | First lien | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases | 10.20% | 9.90%
Consumer | NTM Loans | Green Loans | Second lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | Loan | 12 | 12
Total loans and leases | $ 3,578 | $ 3,559
Consumer | NTM Loans | Green Loans | Second lien | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases | 0.40% | 0.40%
Consumer | NTM Loans | Interest Only Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans and leases | $ 717,500 | $ 784,400
Consumer | NTM Loans | Interest Only Loans | First lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | Loan | 468 | 522
Total loans and leases | $ 717,484 | $ 784,364
Consumer | NTM Loans | Interest Only Loans | First lien | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases | 88.90% | 88.60%
Consumer | NTM Loans | Negative amortization |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans and leases | $ 3,700 | $ 9,800
Consumer | NTM Loans | Negative amortization | First lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | Loan | 11 | 22
Total loans and leases | $ 3,674 | $ 9,756
Consumer | NTM Loans | Negative amortization | First lien | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases | 0.50% | 1.10%

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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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