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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgage Performance by Credit Score (Detail)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Loan
Dec. 31, 2015
USD ($)
Loan
Sep. 30, 2015
USD ($)
Financing Receivable, Recorded Investment [Line Items]      
Loans $ 6,568,791 $ 5,184,394 $ 4,730,077
Non-Traditional Mortgages (NTM)      
Financing Receivable, Recorded Investment [Line Items]      
Loans $ 891,083 $ 785,908  
Consumer | Non-Traditional Mortgages (NTM)      
Financing Receivable, Recorded Investment [Line Items]      
Count | Loan 697 689  
Loans $ 891,083 $ 785,908  
Amount change $ 105,200    
Percent Change 13.40%    
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens      
Financing Receivable, Recorded Investment [Line Items]      
Count | Loan 684 672  
Loans $ 887,374 $ 781,091  
Consumer | Non-Traditional Mortgages (NTM) | Green Loans      
Financing Receivable, Recorded Investment [Line Items]      
Loans $ 101,200 $ 109,800  
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens      
Financing Receivable, Recorded Investment [Line Items]      
Count | Loan 112 121  
Loans $ 97,448 $ 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 17 21  
Loans $ 11,070 $ 14,041  
Count Change | Loan (4)    
Amount change $ (2,971)    
Percent Change (3.00%)    
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 11.40% 14.40%  
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | 700-799      
Financing Receivable, Recorded Investment [Line Items]      
Count | Loan 58 56  
Loans $ 38,137 $ 44,924  
Count Change | Loan 2    
Amount change $ (6,787)    
Percent Change (6.90%)    
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 39.20% 46.10%  
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | 600-699      
Financing Receivable, Recorded Investment [Line Items]      
Count | Loan 30 21  
Loans $ 33,560 $ 21,032  
Count Change | Loan 9    
Amount change $ 12,528    
Percent Change 12.80%    
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 34.40% 21.60%  
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | Less than 600      
Financing Receivable, Recorded Investment [Line Items]      
Count | Loan 2 5  
Loans $ 2,257 $ 4,036  
Count Change | Loan (3)    
Amount change $ (1,779)    
Percent Change (1.80%)    
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 2.30% 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 9  
Loans $ 12,424 $ 13,415  
Count Change | Loan (4)    
Amount change $ (991)    
Percent Change (1.10%)    
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 12.70% 13.80%