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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