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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgages Portfolio (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 USD ($) Loan | Dec. 31, 2015 USD ($) Loan | Dec. 31, 2015 USD ($) Loan | Mar. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 5,463,068 | $ 5,184,394 | $ 5,184,394 | $ 3,933,715
Loan Portfolio | Loan Portfolio Concentration Risk |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Concentration risk percentage | 100.00% |  | 100.00% |
Non-Traditional Mortgages (NTM) |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 799,801 | 785,908 | $ 785,908 |
Non-Traditional Mortgages (NTM) | Loan Portfolio | Loan Portfolio Concentration Risk |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Concentration risk percentage | 14.60% |  | 15.20% |
Non-Traditional Mortgages (NTM) | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Count | Loan | 690 |  | 689 |
Gross loans | $ 799,801 | 785,908 | $ 785,908 |
Non-Traditional Mortgages (NTM) | Consumer | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Concentration risk percentage | 100.00% |  | 100.00% |
Non-Traditional Mortgages (NTM) | Consumer | Loan Portfolio | Loan Portfolio Concentration Risk |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Concentration risk percentage | 14.60% |  | 15.20% |
Non-Traditional Mortgages (NTM) | Consumer | Green Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 106,500 | 109,800 | $ 109,800 |
Non-Traditional Mortgages (NTM) | Consumer | Interest Only Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 682,000 | 664,500 | 664,500 |
Non-Traditional Mortgages (NTM) | Consumer | Negative amortization |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 11,300 | 11,600 | $ 11,600 |
Non-Traditional Mortgages (NTM) | Consumer | First lien |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Count | Loan | 674 |  | 672 |
Gross loans | $ 795,320 | $ 781,091 | $ 781,091 |
Non-Traditional Mortgages (NTM) | Consumer | First lien | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Concentration risk percentage | 99.40% |  | 99.30% |
Non-Traditional Mortgages (NTM) | Consumer | First lien | Green Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Count | Loan | 119 | 121 | 121 |
Gross loans | $ 102,130 | $ 105,131 | $ 105,131 |
Non-Traditional Mortgages (NTM) | Consumer | First lien | Green Loans | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Concentration risk percentage | 12.80% |  | 13.40% |
Non-Traditional Mortgages (NTM) | Consumer | First lien | Interest Only Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Count | Loan | 526 |  | 521 |
Gross loans | $ 681,870 | 664,358 | $ 664,358 |
Non-Traditional Mortgages (NTM) | Consumer | First lien | Interest Only Loans | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Concentration risk percentage | 85.20% |  | 84.40% |
Non-Traditional Mortgages (NTM) | Consumer | First lien | Negative amortization |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Count | Loan | 29 |  | 30 |
Gross loans | $ 11,320 | 11,602 | $ 11,602 |
Non-Traditional Mortgages (NTM) | Consumer | First lien | Negative amortization | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Concentration risk percentage | 1.40% |  | 1.50% |
Non-Traditional Mortgages (NTM) | Consumer | Green Loans (HELOC) - second liens |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Count | Loan | 16 |  | 17 |
Gross loans | $ 4,481 | 4,817 | $ 4,817 |
Non-Traditional Mortgages (NTM) | Consumer | Green Loans (HELOC) - second liens | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Concentration risk percentage | 0.60% |  | 0.70% |
Non-Traditional Mortgages (NTM) | Consumer | Green Loans (HELOC) - second liens | Green Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Count | Loan | 15 |  | 16 |
Gross loans | $ 4,368 | 4,704 | $ 4,704 |
Non-Traditional Mortgages (NTM) | Consumer | Green Loans (HELOC) - second liens | Green Loans | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Concentration risk percentage | 0.50% |  | 0.60% |
Non-Traditional Mortgages (NTM) | Consumer | Green Loans (HELOC) - second liens | Interest Only Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Count | Loan | 1 |  | 1 |
Gross loans | $ 113 | $ 113 | $ 113 |
Non-Traditional Mortgages (NTM) | Consumer | Green Loans (HELOC) - second liens | Interest Only Loans | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Concentration risk percentage | 0.10% |  | 0.10% |

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. 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=65884687&loc=d3e4428-111522 + Details
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