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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, 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%