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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Additional Information (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Loan
bulk_loan_acquisition
Jun. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Loan
Sep. 30, 2015
USD ($)
Loan
bulk_loan_acquisition
Sep. 30, 2014
USD ($)
Loan
Dec. 31, 2014
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 4,730,077,000   $ 2,712,068,000 $ 4,730,077,000 $ 2,712,068,000 $ 3,949,122,000
Number of Loans | Loan 13   1 15 1  
Loans delinquent       60 days    
Number of bulk acquisitions | bulk_loan_acquisition 2     3    
Unpaid principal balance on loan acquisition $ 145,500,000     $ 228,000,000    
Fair Value of loan acquisition 138,800,000     218,600,000    
Unpaid principal balance with credit quality deterioration at acquisition 145,500,000     177,100,000    
Fair value with credit quality deterioration at acquisition 138,800,000     169,100,000    
Unpaid principal balances of PCI loans sold 40,900,000   $ 61,700,000 40,900,000 $ 92,400,000  
Carrying value of loans sold 25,000,000   39,100,000 25,000,000 56,900,000  
Gain (loss) on PCI loans sold 5,900,000   9,500,000 5,900,000 11,800,000  
Single Family Residential Mortgage            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 2,013,450,000   1,191,021,000 2,013,450,000 1,191,021,000  
Increase (decrease) in loans receivable   $ 476,900,000        
Multi-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 823,415,000   $ 367,364,000 823,415,000 $ 367,364,000 955,683,000
Unfunded Loan Commitment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unfunded loan commitments 1,700,000     $ 1,700,000   $ 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 (NTM)            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 759,278,000     $ 759,278,000   $ 350,575,000
Increase (decrease) in loans receivable       $ 408,700,000    
Increase (decrease) in loans receivable, percentage       116.60%    
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 116,800,000     $ 116,800,000   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 630,500,000     $ 630,500,000   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 12,000,000     12,000,000   13,100,000
Non-Traditional Mortgages (NTM) | Nonperforming Financing Receivable | Green Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 10,200,000     10,200,000   12,500,000
Non-Traditional Mortgages (NTM) | Nonperforming Financing Receivable | Interest Only Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 3,700,000     3,700,000   2,000,000
Non-Traditional Mortgages (NTM) | Nonperforming Financing Receivable | Negative amortization            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 0     $ 0   $ 0
Non-Traditional Mortgages (NTM) | Loan Portfolio | Loan Portfolio Concentration Risk            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Concentration risk percentage       16.10%   8.90%