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Loans Receivable, Net - Components of Loans Receivable, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total loans $ 5,542,373   $ 3,974,402      
Purchased credit impaired ("PCI") loans 9,700   1,712      
Total Loans 5,552,073   3,976,114      
Deferred origination costs, net 8,707   5,380      
Allowance for loan losses (16,821) $ (16,691) (15,721) $ (16,584) $ (16,557) $ (15,183)
Total loans, net 5,543,959   3,965,773      
Commercial            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total loans 3,089,172   1,943,444      
Commercial | Commercial And Industrial            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total loans 342,555   187,645      
Commercial | Commercial Real Estate - Owner Occupied            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total loans 734,720   569,497      
Commercial | Commercial Real Estate - Investor            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total loans 2,011,897   1,186,302      
Consumer            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total loans 2,453,201   2,030,958      
Allowance for loan losses (530) $ (526) (614) $ (758) $ (930) $ (1,110)
Consumer | Residential real estate            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total loans 2,019,918   1,748,590      
Consumer | Home Equity Loans and Lines            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total loans 358,728   281,143      
Consumer | Other Consumer            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total loans $ 74,555   $ 1,225