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Loans Receivable and Allowance for Credit Losses (Summary of COVID-19 Impact) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Aug. 03, 2020
Jul. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 9,756,809     $ 7,332,885
SB One Bancorp        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans   $ 47,500    
First 90-day Deferral Period        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans     $ 27,000  
Second 90-Day Deferral Period, Expected To Be Granted        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans     84,900  
Completed Deferral Period        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans     198,900  
Hotel        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans   92,400    
Retail Properties        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans   43,700    
Restaurants        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans   31,400    
Suburban Office Space        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans   15,100    
Residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans   42,700    
Payment Deferral | Maximum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans     $ 1,310,000  
Percentage of total loans     16.80%  
Payment Deferral | Minimum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans   $ 310,800 $ 310,800  
Percentage of total loans     3.20%