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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2015 USD ($) Loan bulk_loan_acquisition | Dec. 31, 2014 USD ($) Loan | Dec. 31, 2013 USD ($) Loan bulk_loan_acquisition
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 5,184,394,000 | $ 3,949,122,000 |
Percentage decrease in credit score to run exception report | 10.00% |  |
Number of Loans | Loan | 14 | 6 | 2
Loans delinquent | 60 days |  |
Number of bulk loan acquisitions | bulk_loan_acquisition | 7 |  | 5
Unpaid principal balance of loan acquisition | $ 622,100,000 |  | $ 1,020,000,000
Fair value of loan acquisition | 578,700,000 |  | 849,900,000
Unpaid principal balance with credit quality deterioration at acquisition | 571,200,000 |  | 485,100,000
Fair value with credit quality deterioration at acquisition | 529,200,000 |  | 348,600,000
Unpaid principal balances of PCI loans sold | 52,400,000 | $ 91,900,000 | 141,700,000
Carrying value of loans sold | 32,500,000 | 56,700,000 | 80,500,000
Gain (loss) on PCI loans sold | 9,400,000 | 11,800,000 | 2,400,000
Discount on loans and leases purchased | 1,400,000 | 0 | $ 43,400,000
Unfunded Loan Commitment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unfunded loan commitments | $ 2,100,000 | $ 1,900,000 |
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] |  |  |
Gross loans | $ 785,908,000 | $ 350,575,000 |
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 |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | Loan | 14 | 6 | 2
Consumer | Single family residential mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 2,150,453,000 | $ 1,048,485,000 |
Number of Loans | Loan | 13 | 5 |
Consumer | Non-Traditional Mortgages |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 785,908,000 | $ 350,575,000 |
Increase (decrease) in loans receivable | $ 435,300,000 |  |
Increase (decrease) in loans receivable, percentage | 124.20% |  |
Consumer | Non-Traditional Mortgages | Single family residential mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 675,960,000 | 222,306,000 |
Consumer | Non-Traditional Mortgages | Green Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 109,800,000 | 128,200,000 |
Interest only notes balloon payment period | 15 years |  |
Consumer | Non-Traditional Mortgages | Interest Only Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 664,500,000 | 209,300,000 |
Consumer | Non-Traditional Mortgages | Negative amortization |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 11,600,000 | 13,100,000 |
Consumer | Non-Traditional Mortgages | Nonperforming Financing Receivable | Green Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 10,100,000 | 12,500,000 |
Consumer | Non-Traditional Mortgages | Nonperforming Financing Receivable | Interest Only Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 4,600,000 | 2,000,000 |
Consumer | Non-Traditional Mortgages | Nonperforming Financing Receivable | Negative amortization |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 0 | $ 0 |
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% |

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