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Loans Receivable and Allowance for Credit Losses (Summary of COVID-19 Impact) (Detail) - USD ($)
$ in Thousands
Aug. 03, 2020
Jul. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans     $ 7,766,391 $ 7,332,885
First 90-day Deferral Period | Subsequent Event        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans   $ 49,700    
Second 90-Day Deferral Period, Expected To Be Granted | Subsequent Event        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans   354,400    
Completed Deferral Period | Subsequent Event        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans   902,400    
Regular Payment Period | Subsequent Event        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 546,200      
Hotel | Subsequent Event        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 129,900      
Weighted average loan-to-value 53.00%      
Retail Properties | Subsequent Event        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 130,600      
Weighted average loan-to-value 66.00%      
Restaurants | Subsequent Event        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 24,900      
Weighted average loan-to-value 59.00%      
Payment Deferral | Subsequent Event        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans   1,310,000    
Payment Deferral | Maximum | Subsequent Event        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans   $ 1,310,000    
Percentage of total loans   16.80%    
Payment Deferral | Minimum | Subsequent Event        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 404,100 $ 404,100    
Percentage of total loans   5.20%