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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgage Performance by Credit Score (Detail)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Loan
Dec. 31, 2015
USD ($)
Loan
Jun. 30, 2015
USD ($)
Financing Receivable, Recorded Investment [Line Items]      
Gross loans $ 6,236,115 $ 5,184,394 $ 4,473,095
Non-Traditional Mortgages (NTM)      
Financing Receivable, Recorded Investment [Line Items]      
Gross loans $ 842,634 $ 785,908  
Consumer | Non-Traditional Mortgages (NTM)      
Financing Receivable, Recorded Investment [Line Items]      
Count | Loan 699 689  
Gross loans $ 842,634 $ 785,908  
Amount change $ 56,700    
Percent Change 7.20%    
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens      
Financing Receivable, Recorded Investment [Line Items]      
Count | Loan 684 672  
Gross loans $ 838,336 $ 781,091  
Consumer | Non-Traditional Mortgages (NTM) | Green Loans      
Financing Receivable, Recorded Investment [Line Items]      
Gross loans $ 103,900 $ 109,800  
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens      
Financing Receivable, Recorded Investment [Line Items]      
Count | Loan 116 121  
Gross loans $ 99,620 $ 105,131  
Count Change | Loan 0    
Amount change $ 0    
Percent Change 0.00%    
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio      
Financing Receivable, Recorded Investment [Line Items]      
Concentration risk percentage 100.00%    
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | Greater than 800      
Financing Receivable, Recorded Investment [Line Items]      
Count | Loan 20 22  
Gross loans $ 12,131 $ 14,067  
Count Change | Loan (2)    
Amount change $ (1,936)    
Percent Change (1.90%)    
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | Greater than 800 | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio      
Financing Receivable, Recorded Investment [Line Items]      
Concentration risk percentage 12.20% 14.10%  
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | 700-799      
Financing Receivable, Recorded Investment [Line Items]      
Count | Loan 56 57  
Gross loans $ 36,208 $ 44,307  
Count Change | Loan (1)    
Amount change $ (8,099)    
Percent Change (8.10%)    
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | 700-799 | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio      
Financing Receivable, Recorded Investment [Line Items]      
Concentration risk percentage 36.30% 44.40%  
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | 600-699      
Financing Receivable, Recorded Investment [Line Items]      
Count | Loan 31 22  
Gross loans $ 34,731 $ 23,281  
Count Change | Loan 9    
Amount change $ 11,450    
Percent Change 11.50%    
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | 600-699 | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio      
Financing Receivable, Recorded Investment [Line Items]      
Concentration risk percentage 34.90% 23.40%  
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | Less than 600      
Financing Receivable, Recorded Investment [Line Items]      
Count | Loan 4 5  
Gross loans $ 4,079 $ 4,050  
Count Change | Loan (1)    
Amount change $ 29    
Percent Change 0.00%    
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | Less than 600 | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio      
Financing Receivable, Recorded Investment [Line Items]      
Concentration risk percentage 4.10% 4.10%  
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | No FICO      
Financing Receivable, Recorded Investment [Line Items]      
Count | Loan 5 10  
Gross loans $ 12,471 $ 13,915  
Count Change | Loan (5)    
Amount change $ (1,444)    
Percent Change (1.50%)    
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | No FICO | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio      
Financing Receivable, Recorded Investment [Line Items]      
Concentration risk percentage 12.50% 14.00%