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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgages Portfolio (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) Loan | Dec. 31, 2014 USD ($) Loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount | $ 5,184,394 | $ 3,949,122
Loan Portfolio | Loan Portfolio Concentration Risk |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
Non-Traditional Mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount | $ 785,908 | $ 350,575
Non-Traditional Mortgages | Loan Portfolio | Loan Portfolio Concentration Risk |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 15.20% | 8.90%
Consumer | Non-Traditional Mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | Loan | 689 | 407
Amount | $ 785,908 | $ 350,575
Consumer | Non-Traditional Mortgages | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
Consumer | Non-Traditional Mortgages | Loan Portfolio | Loan Portfolio Concentration Risk |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 15.20% | 8.90%
Consumer | Non-Traditional Mortgages | First lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | Loan | 672 | 387
Amount | $ 781,091 | $ 345,483
Consumer | Non-Traditional Mortgages | First lien | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 99.30% | 98.50%
Consumer | Non-Traditional Mortgages | Second lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | Loan | 17 | 20
Amount | $ 4,817 | $ 5,092
Consumer | Non-Traditional Mortgages | Second lien | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.70% | 1.50%
Consumer | Non-Traditional Mortgages | Green Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount | $ 109,800 | $ 128,200
Consumer | Non-Traditional Mortgages | Green Loans | First lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | Loan | 121 | 148
Amount | $ 105,131 | $ 123,177
Consumer | Non-Traditional Mortgages | Green Loans | First lien | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 13.40% | 35.10%
Consumer | Non-Traditional Mortgages | Green Loans | Second lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | Loan | 16 | 19
Amount | $ 4,704 | $ 4,979
Consumer | Non-Traditional Mortgages | Green Loans | Second lien | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.60% | 1.40%
Consumer | Non-Traditional Mortgages | Interest Only Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount | $ 664,500 | $ 209,300
Consumer | Non-Traditional Mortgages | Interest Only Loans | First lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | Loan | 521 | 207
Amount | $ 664,358 | $ 209,207
Consumer | Non-Traditional Mortgages | Interest Only Loans | First lien | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 84.40% | 59.70%
Consumer | Non-Traditional Mortgages | Interest Only Loans | Second lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | Loan | 1 | 1
Amount | $ 113 | $ 113
Consumer | Non-Traditional Mortgages | Interest Only Loans | Second lien | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.10% | 0.10%
Consumer | Non-Traditional Mortgages | Negative amortization |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount | $ 11,600 | $ 13,100
Consumer | Non-Traditional Mortgages | Negative amortization | First lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | Loan | 30 | 32
Amount | $ 11,602 | $ 13,099
Consumer | Non-Traditional Mortgages | Negative amortization | First lien | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 1.50% | 3.70%

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