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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Additional Information (Details) (USD $)
 3 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Loan
Sep. 30, 2013
Loan
Sep. 30, 2014
Loan
Sep. 30, 2013
Loan
bulk_loan_acquisition
Dec. 31, 2013
Sep. 30, 2014
Unfunded Loan Commitment
Dec. 31, 2013
Unfunded Loan Commitment
Sep. 30, 2014
Loan Portfolio Concentration Risk
Loan Portfolio
Dec. 31, 2013
Loan Portfolio Concentration Risk
Loan Portfolio
Sep. 30, 2014
Non-Traditional Mortgages (NTM)
Dec. 31, 2013
Non-Traditional Mortgages (NTM)
Sep. 30, 2014
Non-Traditional Mortgages (NTM)
Green Loans
Dec. 31, 2013
Non-Traditional Mortgages (NTM)
Green Loans
Sep. 30, 2014
Non-Traditional Mortgages (NTM)
Interest Only Loans
Dec. 31, 2013
Non-Traditional Mortgages (NTM)
Interest Only Loans
Sep. 30, 2014
Non-Traditional Mortgages (NTM)
Negative amortization
Dec. 31, 2013
Non-Traditional Mortgages (NTM)
Negative amortization
Sep. 30, 2014
Non-Traditional Mortgages (NTM)
Loan Portfolio Concentration Risk
Loan Portfolio
Dec. 31, 2013
Non-Traditional Mortgages (NTM)
Loan Portfolio Concentration Risk
Loan Portfolio
Sep. 30, 2014
Nonperforming Financing Receivable
Non-Traditional Mortgages (NTM)
Green Loans
Dec. 31, 2013
Nonperforming Financing Receivable
Non-Traditional Mortgages (NTM)
Green Loans
Sep. 30, 2014
Nonperforming Financing Receivable
Non-Traditional Mortgages (NTM)
Interest Only Loans
Dec. 31, 2013
Nonperforming Financing Receivable
Non-Traditional Mortgages (NTM)
Interest Only Loans
Sep. 30, 2014
Nonperforming Financing Receivable
Non-Traditional Mortgages (NTM)
Negative amortization
Dec. 31, 2013
Nonperforming Financing Receivable
Non-Traditional Mortgages (NTM)
Negative amortization
Accounts, Notes, Loans and Financing Receivable [Line Items]                                                  
Gross loans $ 2,712,068,000 $ 2,596,188,000 $ 2,712,068,000 $ 2,596,188,000 $ 2,446,111,000         $ 335,355,000 $ 309,597,000 $ 131,300,000 $ 153,000,000 $ 190,800,000 $ 140,000,000 $ 13,200,000 $ 16,600,000     $ 12,600,000 $ 5,700,000 $ 1,100,000 $ 752,000 $ 0 $ 1,200,000
Concentration risk percentage               100.00% 100.00%                 12.40% 12.70%            
Interest only notes balloon payment period                       15 years                          
Increase (decrease) in loans receivable                   25,800,000   (21,700,000)   50,900,000   (3,400,000)                  
Increase (decrease) in loans receivable, percentage                   8.30%   (14.20%)   36.30%   (20.40%)                  
Loan portfolio origination                           45,600,000                      
Loans held for sale from transfers                           77,100,000                      
Loans transferred to held for sale     65,584,000 105,126,000                   25,300,000                      
Net amortization                           46,500,000                      
Percentage decrease in credit score to run exception report     10.00%                                            
Unfunded loan commitments           1,800,000 1,400,000                                    
Number of Loans 1 0 1 0                                          
Loans delinquent     60 days                                            
Unpaid principal balances of PCI loans sold 61,700,000 9,900,000 92,400,000 134,900,000                                          
Carrying value of loans sold 39,100,000 6,000,000 56,900,000 76,400,000                                          
Gain (loss) on PCI loans sold 9,500,000   11,800,000                                            
Fair value of loan acquisition   213,900,000   342,100,000                                          
Unpaid principal balance of loan acquisition   $ 237,400,000   $ 473,900,000                                          
Number of bulk loan acquisitions       5