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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgage Performance by Credit Score (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 USD ($) Loan | Dec. 31, 2015 USD ($) Loan | Dec. 31, 2015 USD ($) Loan | Mar. 31, 2015 USD ($)
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Gross loans | $ 5,463,068 | $ 5,184,394 | $ 5,184,394 | $ 3,933,715
Non-Traditional Mortgages (NTM) |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Gross loans | $ 799,801 | 785,908 | $ 785,908 |
Consumer | Non-Traditional Mortgages (NTM) |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Count | Loan | 690 |  | 689 |
Gross loans | $ 799,801 | 785,908 | $ 785,908 |
Amount change | $ 13,900 |  |  |
Percent Change | 1.80% |  |  |
Consumer | Non-Traditional Mortgages (NTM) | First lien |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Count | Loan | 674 |  | 672 |
Gross loans | $ 795,320 | 781,091 | $ 781,091 |
Consumer | Non-Traditional Mortgages (NTM) | Green Loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Gross loans | $ 106,500 | $ 109,800 | $ 109,800 |
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Count | Loan | 119 | 121 | 121 |
Gross loans | $ 102,130 | $ 105,131 | $ 105,131 |
Count Change | Loan | (2) |  |  |
Amount change | $ (3,001) |  |  |
Percent Change | 0.00% |  |  |
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Concentration risk percentage | 100.00% | 100.00% |  |
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | Greater than 800 |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Count | Loan | 23 | 22 |  |
Gross loans | $ 15,465 | $ 14,438 | 14,438 |
Count Change | Loan | 1 |  |  |
Amount change | $ 1,027 |  |  |
Percent Change | 1.40% |  |  |
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | Greater than 800 | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Concentration risk percentage | 15.10% | 13.70% |  |
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | 700-799 |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Count | Loan | 56 | 60 |  |
Gross loans | $ 41,702 | $ 48,775 | 48,775 |
Count Change | Loan | (4) |  |  |
Amount change | $ (7,073) |  |  |
Percent Change | (5.70%) |  |  |
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | 700-799 | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Concentration risk percentage | 40.80% | 46.50% |  |
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | FICO Score, 600 to 699 [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Count | Loan | 23 | 23 |  |
Gross loans | $ 24,901 | $ 23,600 | 23,600 |
Count Change | Loan | 0 |  |  |
Amount change | $ 1,301 |  |  |
Percent Change | 2.00% |  |  |
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | FICO Score, 600 to 699 [Member] | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Concentration risk percentage | 24.40% | 22.40% |  |
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | Less than 600 |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Count | Loan | 5 | 5 |  |
Gross loans | $ 4,860 | $ 4,030 | 4,030 |
Count Change | Loan | 0 |  |  |
Amount change | $ 830 |  |  |
Percent Change | 1.00% |  |  |
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | Less than 600 | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Concentration risk percentage | 4.80% | 3.80% |  |
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | No FICO |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Count | Loan | 12 | 11 |  |
Gross loans | $ 15,202 | $ 14,288 | $ 14,288 |
Count Change | Loan | 1 |  |  |
Amount change | $ 914 |  |  |
Percent Change | 1.30% |  |  |
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | No FICO | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Concentration risk percentage | 14.90% | 13.60% |  |

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