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Loans and Allowance for Credit Losses Summary of Delinquency and Non-Performing Status by Portfolio Segment (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]    
Net Loans $ 18,990,986 $ 18,900,820
Real-estate - home equity    
Financing Receivable, Impaired [Line Items]    
Net Loans 1,149,958 1,202,913
Real estate - residential mortgage    
Financing Receivable, Impaired [Line Items]    
Net Loans 3,254,058 3,141,915
Consumer    
Financing Receivable, Impaired [Line Items]    
Net Loans 451,857 466,772
Equipment lease financing, other and overdrafts    
Financing Receivable, Impaired [Line Items]    
Net Loans $ 233,768 $ 266,082