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Allowance for Credit Losses and Credit Quality - Allowance for Loan and Lease Losses and Balances Outstanding by Allowance Methodology (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Allowance for loan and lease losses            
Collectively evaluated for impairment     $ 102,186      
Individually evaluated for impairment     7,237      
Total $ 515,229 $ 461,114 113,052 $ 121,218 $ 146,503 $ 157,446
Loans and leases outstanding            
Collectively evaluated for impairment     34,074,141      
Individually evaluated for impairment     176,537      
Total 34,343,691   34,497,464      
Portfolios acquired with deteriorated credit quality            
Allowance for loan and lease losses            
Total     3,629      
Loans and leases outstanding            
Total     246,786      
Consumer            
Allowance for loan and lease losses            
Collectively evaluated for impairment     26,430      
Individually evaluated for impairment     1,468      
Total 135,137 157,685 28,572 42,787 70,711 80,017
Loans and leases outstanding            
Collectively evaluated for impairment     11,087,534      
Individually evaluated for impairment     60,694      
Total 10,434,438   11,221,123      
Consumer | Portfolios acquired with deteriorated credit quality            
Allowance for loan and lease losses            
Total     674      
Loans and leases outstanding            
Total     72,895      
Commercial            
Allowance for loan and lease losses            
Collectively evaluated for impairment     75,756      
Individually evaluated for impairment     5,769      
Total 380,092 $ 303,429 84,480 $ 78,431 $ 75,792 $ 77,429
Loans and leases outstanding            
Collectively evaluated for impairment     22,986,607      
Individually evaluated for impairment     115,843      
Total $ 23,909,253   23,276,341      
Commercial | Portfolios acquired with deteriorated credit quality            
Allowance for loan and lease losses            
Total     2,955      
Loans and leases outstanding            
Total     $ 173,891