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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Schedule of Loans and Leases Receivable (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases $ 6,659,407 $ 6,034,752    
Allowance for loan and lease losses (49,333) (40,444) $ (35,533) $ (29,480)
Loans and leases receivable, net $ 6,610,074 $ 5,994,308    
Loan Portfolio | Loan Portfolio Concentration Risk        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percentage to total loans and leases 100.00% 100.00%    
PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases $ 0 $ 141,826    
Allowance for loan and lease losses $ 0 $ (104)    
PCI Loans | Loan Portfolio | Loan Portfolio Concentration Risk        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percentage to total loans and leases 0.00% 2.30%    
NTM Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases $ 806,933 $ 885,148    
NTM Loans | Loan Portfolio | Loan Portfolio Concentration Risk        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percentage to total loans and leases 12.10% 14.70%    
Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases $ 5,852,474 $ 5,007,778    
Traditional Loans and Leases | Loan Portfolio | Loan Portfolio Concentration Risk        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percentage to total loans and leases 87.90% 83.00%    
Total NTM and Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases $ 6,659,407 $ 5,892,926    
Total NTM and Traditional Loans and Leases | Loan Portfolio | Loan Portfolio Concentration Risk        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percentage to total loans and leases 100.00% 97.70%    
Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases $ 1,701,951 $ 1,522,960    
Allowance for loan and lease losses (14,280) (7,584) (5,850)  
Commercial | Commercial and industrial | PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 4,760    
Allowance for loan and lease losses 0 0    
Commercial | Commercial and industrial | NTM Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 0    
Commercial | Commercial and industrial | Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 1,701,951 1,518,200    
Commercial | Commercial and industrial | Total NTM and Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 1,701,951 1,518,200    
Commercial | Commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 717,415 729,959    
Allowance for loan and lease losses (4,971) (5,467) (4,252)  
Commercial | Commercial real estate | PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 1,182    
Allowance for loan and lease losses 0 (5)    
Commercial | Commercial real estate | NTM Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 0    
Commercial | Commercial real estate | Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 717,415 728,777    
Commercial | Commercial real estate | Total NTM and Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 717,415 728,777    
Commercial | Multifamily        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 1,816,141 1,365,262    
Allowance for loan and lease losses (13,265) (11,376) (6,012)  
Commercial | Multifamily | PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 0    
Allowance for loan and lease losses 0 0    
Commercial | Multifamily | NTM Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 0    
Commercial | Multifamily | Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 1,816,141 1,365,262    
Commercial | Multifamily | Total NTM and Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 1,816,141 1,365,262    
Commercial | SBA        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 78,699 73,840    
Allowance for loan and lease losses (1,701) (939) (683)  
Commercial | SBA | PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 2,672    
Allowance for loan and lease losses 0 (19)    
Commercial | SBA | NTM Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 0    
Commercial | SBA | Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 78,699 71,168    
Commercial | SBA | Total NTM and Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 78,699 71,168    
Commercial | Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 182,960 125,100    
Allowance for loan and lease losses (3,318) (2,015) (1,530)  
Commercial | Construction | PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 0    
Allowance for loan and lease losses 0 0    
Commercial | Construction | NTM Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 0    
Commercial | Construction | Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 182,960 125,100    
Commercial | Construction | Total NTM and Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 182,960 125,100    
Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 13 379    
Allowance for loan and lease losses 0 (6) $ (2,195)  
Commercial | Lease financing | PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 0    
Allowance for loan and lease losses 0 0    
Commercial | Lease financing | NTM Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 0    
Commercial | Lease financing | Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 13 379    
Commercial | Lease financing | Total NTM and Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 13 379    
Consumer | NTM Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases $ 806,933 $ 885,148    
Consumer | NTM Loans | Loan Portfolio | Loan Portfolio Concentration Risk        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percentage to total loans and leases 12.10% 14.70%    
Consumer | Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases   $ 5,007,778    
Consumer | Green Loans (HELOC) - first liens | NTM Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases $ 803,355 881,589    
Consumer | Green Loans (HELOC) - second liens | NTM Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 3,578 3,559    
Consumer | Single family residential mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 1,973,452 2,019,161    
Consumer | Single family residential mortgage | PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 133,212    
Consumer | Single family residential mortgage | NTM Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 721,158 794,120    
Consumer | Single family residential mortgage | Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 1,252,294 1,091,829    
Consumer | Single family residential mortgage | Total NTM and Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 1,973,452 1,885,949    
Consumer | Home equity loans | Green Loans (HELOC) - first liens        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 82,197 87,469    
Consumer | Home equity loans | Green Loans (HELOC) - first liens | PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 0    
Consumer | Home equity loans | Green Loans (HELOC) - first liens | NTM Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 82,197 87,469    
Consumer | Home equity loans | Green Loans (HELOC) - first liens | Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 0    
Consumer | Home equity loans | Green Loans (HELOC) - first liens | Total NTM and Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 82,197 87,469    
Consumer | Home equity loans | Green Loans (HELOC) - second liens        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 3,578 3,559    
Consumer | Home equity loans | Green Loans (HELOC) - second liens | PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 0    
Consumer | Home equity loans | Green Loans (HELOC) - second liens | NTM Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 3,578 3,559    
Consumer | Home equity loans | Green Loans (HELOC) - second liens | Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 0    
Consumer | Home equity loans | Green Loans (HELOC) - second liens | Total NTM and Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 3,578 3,559    
Consumer | Other consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 103,001 107,063    
Consumer | Other consumer | PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 0    
Consumer | Other consumer | NTM Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 0    
Consumer | Other consumer | Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 103,001 107,063    
Consumer | Other consumer | Total NTM and Traditional Loans and Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases $ 103,001 $ 107,063