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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Additional Information (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2016 USD ($) Loan bulk_loan_acquisition | Jun. 30, 2015 USD ($) Loan bulk_loan_acquisition | Jun. 30, 2016 USD ($) Loan bulk_loan_acquisition | Jun. 30, 2015 USD ($) Loan bulk_loan_acquisition | Dec. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | $ 6,236,115,000 | $ 4,473,095,000 | $ 6,236,115,000 | $ 4,473,095,000 | $ 5,184,394,000
Percentage decrease in credit score to run exception report |  |  | 10.00% |  |
Number of Loans | Loan |  | 0 |  | 2 |
Troubled debt restructured loans and leases |  | $ 0 |  | $ 1,430,000 |
Number of loans modified that had payments default during the period | Loan | 1 | 0 | 3 | 0 |
Aggregate principal, loans modified that had payments default during the period | $ 110,000 |  | $ 518,000 |  |
Loans delinquent |  |  | 60 days |  |
Number of bulk acquisitions | bulk_loan_acquisition | 1 | 1 | 1 | 1 |
Unpaid principal balance on loan acquisition | $ 103,800,000 | $ 82,500,000 | $ 103,800,000 | $ 82,500,000 |
Fair value of loan acquisition | $ 91,000,000 | 79,900,000 | $ 91,000,000 | 79,900,000 |
Unpaid principal balance with credit quality deterioration at acquisition |  | 31,600,000 |  | 31,600,000 |
Fair value with credit quality deterioration at acquisition |  | 30,400,000 |  | 30,400,000 |
Interest rate changes and extension of maturities |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | Loan | 2 |  | 17 |  |
Troubled debt restructured loans and leases | $ 401,000 |  | $ 4,300,000 |  |
Interest rate changes |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | Loan | 1 |  | 2 |  |
Troubled debt restructured loans and leases | $ 69,000 |  | $ 146,000 |  |
Interest rate changes, extension of maturities, and principal payment deferral |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | Loan |  |  | 17 |  |
Troubled debt restructured loans and leases |  |  | $ 4,300,000 |  |
Extension of maturities and principal payment deferral |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | Loan |  |  | 1 |  |
Troubled debt restructured loans and leases |  |  | $ 507,000 |  |
Extension of maturities |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | Loan |  |  | 3 |  |
Troubled debt restructured loans and leases |  |  | $ 273,000 |  |
Unfunded Loan Commitment |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Unfunded loan commitments | $ 1,900,000 |  | $ 1,900,000 |  | 2,100,000
Consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | Loan | 3 |  | 40 |  |
Troubled debt restructured loans and leases | $ 470,000 |  | $ 9,548,000 |  |
Consumer | Single Family Residential Mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 2,555,344,000 | $ 1,840,924,000 | 2,555,344,000 | $ 1,840,924,000 |
Non-Traditional Mortgages (NTM) |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 842,634,000 |  | 842,634,000 |  | 785,908,000
Non-Traditional Mortgages (NTM) | Consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 842,634,000 |  | 842,634,000 |  | 785,908,000
Increase (decrease) in loans receivable |  |  | $ 56,700,000 |  |
Increase (decrease) in loans receivable, percentage |  |  | 7.20% |  |
Non-Traditional Mortgages (NTM) | Consumer | Green Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 103,900,000 |  | $ 103,900,000 |  | 109,800,000
Interest only notes balloon payment period |  |  | 15 years |  |
Non-Traditional Mortgages (NTM) | Consumer | Interest Only Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 727,500,000 |  | $ 727,500,000 |  | 664,500,000
Non-Traditional Mortgages (NTM) | Consumer | Negative amortization |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 11,200,000 |  | 11,200,000 |  | 11,600,000
Non-Traditional Mortgages (NTM) | Consumer | Nonperforming Financing Receivable | Green Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 9,900,000 |  | 9,900,000 |  | 10,100,000
Non-Traditional Mortgages (NTM) | Consumer | Nonperforming Financing Receivable | Interest Only Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 2,700,000 |  | 2,700,000 |  | 4,600,000
Non-Traditional Mortgages (NTM) | Consumer | Nonperforming Financing Receivable | Negative amortization |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | $ 0 |  | $ 0 |  | $ 0
Non-Traditional Mortgages (NTM) | Consumer | Loan Portfolio | Loan Portfolio Concentration Risk |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Concentration risk percentage |  |  | 13.50% |  | 15.20%

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