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Allowance for Loan Losses (the Allowance) - Non-TDR Loan modifications due to COVID-19 (Details)
$ in Thousands
Jul. 15, 2020
USD ($)
item
Oct. 26, 2020
USD ($)
Sep. 30, 2020
USD ($)
Financing Receivable, Modifications [Line Items]      
Portfolio Balance     $ 1,042,400
Commercial mortgage      
Financing Receivable, Modifications [Line Items]      
Active payment deferrals   $ 4,400  
Commercial mortgage | Payment Deferral      
Financing Receivable, Modifications [Line Items]      
Amount of financing receivable modified as non-troubled debt restructuring loans $ 111,000    
Number of non-troubled debt restructurings (TDR) loans that have been modified | item 146    
Number of billing cycles of payment holidays | item 3    
Construction      
Financing Receivable, Modifications [Line Items]      
Active payment deferrals   14,200  
Construction | Payment Deferral      
Financing Receivable, Modifications [Line Items]      
Amount of financing receivable modified as non-troubled debt restructuring loans $ 36,800    
Number of non-troubled debt restructurings (TDR) loans that have been modified | item 35    
Construction | Payment Deferral | Minimum      
Financing Receivable, Modifications [Line Items]      
Number of billing cycles of payment holidays | item 3    
Construction | Payment Deferral | Maximum      
Financing Receivable, Modifications [Line Items]      
Number of billing cycles of payment holidays | item 6    
Consumer      
Financing Receivable, Modifications [Line Items]      
Portfolio Balance     582
Consumer | Payment Deferral | Minimum      
Financing Receivable, Modifications [Line Items]      
Number of billing cycles of payment holidays | item 3    
Consumer | Payment Deferral | Maximum      
Financing Receivable, Modifications [Line Items]      
Number of billing cycles of payment holidays | item 6    
Residential mortgage and home equity loans | Payment Deferral      
Financing Receivable, Modifications [Line Items]      
Amount of financing receivable modified as non-troubled debt restructuring loans $ 6,200    
Number of non-troubled debt restructurings (TDR) loans that have been modified | item 25    
Residential mortgage      
Financing Receivable, Modifications [Line Items]      
Portfolio Balance     $ 44,134
Active payment deferrals   $ 558