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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
--- | --- | --- | ---
Jun. 30, 2015 USD ($) Loan bulk_loan_acquisition | Jun. 30, 2014 USD ($) Loan | Jun. 30, 2015 USD ($) Loan bulk_loan_acquisition | Jun. 30, 2014 USD ($) Loan | Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | $ 4,473,095,000 | $ 2,602,213,000 | $ 4,473,095,000 | $ 2,602,213,000 | $ 3,949,122,000
Number of Loans | Loan | 0 | 0 | 2 | 0 |
Loans delinquent |  |  | 60 days |  |
Unpaid principal balances of PCI loans sold |  | $ 2,500,000 |  | $ 30,200,000 |
Carrying value of loans sold | $ 0 | 1,500,000 | $ 0 | 17,600,000 |
Gain (loss) on PCI loans sold |  | 0 |  | 2,300,000 |
Number of bulk acquisitions | bulk_loan_acquisition | 1 |  | 1 |  |
Unpaid principal balance on loan acquisition | $ 82,500,000 |  | $ 82,500,000 |  |
Fair Value of loan acquisition | 79,900,000 |  | 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 |  |
Single Family Residential Mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 1,840,924,000 | 1,212,813,000 | 1,840,924,000 | 1,212,813,000 |
Increase (decrease) in loans receivable |  |  | 476,900,000 |  |
Multi-family |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 696,768,000 | $ 234,179,000 | 696,768,000 | $ 234,179,000 | 955,683,000
Increase (decrease) in loans receivable |  |  | (242,600,000) |  |
Unfunded Loan Commitment |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Unfunded loan commitments | 2,100,000 |  | $ 2,100,000 |  | $ 1,900,000
Loan Portfolio Concentration Risk | Loan Portfolio |  |  |  |  |
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 | 720,321,000 |  | $ 720,321,000 |  | $ 350,575,000
Increase (decrease) in loans receivable |  |  | $ 369,700,000 |  |
Increase (decrease) in loans receivable, percentage |  |  | 105.50% |  |
Non-Traditional Mortgages (NTM) | Multi-family |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 0 |  | $ 0 |  | 0
Non-Traditional Mortgages (NTM) | Green Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 122,700,000 |  | $ 122,700,000 |  | 128,200,000
Interest only notes balloon payment period |  |  | 15 years |  |
Non-Traditional Mortgages (NTM) | Interest Only Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 585,600,000 |  | $ 585,600,000 |  | 209,300,000
Increase (decrease) in loans receivable |  |  | 277,500,000 |  |
Non-Traditional Mortgages (NTM) | Negative amortization |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 12,100,000 |  | $ 12,100,000 |  | $ 13,100,000
Non-Traditional Mortgages (NTM) | Loan Portfolio Concentration Risk | Loan Portfolio |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Concentration risk percentage |  |  | 16.10% |  | 8.90%
Nonperforming Financing Receivable | Non-Traditional Mortgages (NTM) | Green Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 10,600,000 |  | $ 10,600,000 |  | $ 12,500,000
Nonperforming Financing Receivable | Non-Traditional Mortgages (NTM) | Interest Only Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 4,100,000 |  | 4,100,000 |  | 2,000,000
Nonperforming Financing Receivable | Non-Traditional Mortgages (NTM) | Negative amortization |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | $ 0 |  | $ 0 |  | $ 0

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