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Allowance for Credit Losses - Troubled Debt Restructuring Modifications (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
loan
contract
Dec. 31, 2019
USD ($)
contract
property
Dec. 31, 2018
USD ($)
contract
Troubled debt restructuring modifications      
Number of Contracts | contract 5 3 4
Recorded Investment $ 7,795 $ 1,180 $ 1,244
Related Allowance 590 25 39
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit 6,100,000 6,100,000  
Commitments related to borrowers who had loan terms modified in a TDR 200 4,500  
Loans modified in TDRs that experienced a payment default      
Current 13,221,606 13,148,056  
Total loans and leases $ 13,279,097 $ 13,211,650 $ 13,076,191
Number of loans modified in TDRs that have defaulted in the current period | contract 1 2  
Recorded Investment, Defaulted TDRs $ 500 $ 571  
Number of loans collateralized by real estate property modified in a TDR in the process of foreclosure | contract   1  
Residential mortgage loans collateralized by real estate property and modified in a TDR in the process of foreclosure   $ 300  
Commercial and Industrial      
Troubled debt restructuring modifications      
Number of Contracts | contract 1 2 1
Recorded Investment $ 500 $ 571 $ 369
Related Allowance 30 25 10
Loans modified in TDRs that experienced a payment default      
Current 3,013,692 2,739,448  
Total loans and leases $ 3,019,507 $ 2,743,242 3,208,760
Number of loans modified in TDRs that have defaulted in the current period | contract 1 2  
Recorded Investment, Defaulted TDRs $ 500 $ 571  
Commercial real estate      
Troubled debt restructuring modifications      
Number of Contracts | contract 3    
Recorded Investment $ 6,470    
Related Allowance 470    
Loans modified in TDRs that experienced a payment default      
Current 3,389,070 3,460,121  
Total loans and leases 3,392,676 3,463,953 2,990,783
Lease financing      
Loans modified in TDRs that experienced a payment default      
Current 245,411 202,483  
Total loans and leases $ 245,411 $ 202,483 $ 147,769
Residential      
Troubled debt restructuring modifications      
Period of time monthly payments are lowered to accommodate borrowers' financial needs 2 years    
Number of Contracts | contract   1 3
Recorded Investment   $ 609 $ 875
Related Allowance     29
Loans modified in TDRs that experienced a payment default      
Current $ 3,679,339    
Total loans and leases 3,690,218 $ 4,662,175 4,439,618
Residential | Real estate property held from foreclosed TDR      
Loans modified in TDRs that experienced a payment default      
Number of real estate properties | property   2  
Real estate property held from a foreclosed TDR   $ 300  
Consumer      
Loans modified in TDRs that experienced a payment default      
Current 1,326,879 1,582,452  
Total loans and leases $ 1,353,842 1,620,556 1,662,504
Consumer | Minimum      
Troubled debt restructuring modifications      
Threshold period past due for charge-off 120 days    
Consumer | Maximum      
Troubled debt restructuring modifications      
Threshold period past due for charge-off 180 days    
Construction      
Loans modified in TDRs that experienced a payment default      
Current $ 732,527 516,874  
Total loans and leases $ 735,819 519,241 $ 626,757
Residential Mortgage.      
Troubled debt restructuring modifications      
Number of Contracts | contract 1    
Recorded Investment $ 825    
Related Allowance $ 90    
Loans modified in TDRs that experienced a payment default      
Number of loans collateralized by real estate property modified in a TDR in the process of foreclosure | loan 0    
Residential Mortgage. | Real estate property held from foreclosed TDR      
Loans modified in TDRs that experienced a payment default      
Number of real estate properties | loan 0    
Commitments to extend credit      
Troubled debt restructuring modifications      
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit $ 5,934,535 5,907,690  
Standby letters of credit      
Troubled debt restructuring modifications      
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit 185,108 181,412  
Commercial letters of credit      
Troubled debt restructuring modifications      
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit $ 3,834 $ 7,334