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Allowance for Credit Losses - Troubled Debt Restructuring Modifications (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
contract
loan
Mar. 31, 2019
USD ($)
contract
loan
Dec. 31, 2019
USD ($)
contract
loan
Troubled debt restructuring modifications      
Number of Contracts | contract 1 5  
Recorded Investment $ 500 $ 1,268  
Related Allowance 30 $ 38  
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit 5,900,000   $ 6,100,000
Commitments related to borrowers who had loan terms modified in a TDR 2,000   4,500
Loans modified in TDRs that experienced a payment default      
Current 13,280,037   13,148,056
Total loans and leases $ 13,380,270   13,211,650
Number of loans modified in TDRs that have defaulted in the current period | loan 0 0  
Commercial and Industrial      
Troubled debt restructuring modifications      
Number of Contracts | contract 1 4  
Recorded Investment $ 500 $ 916  
Related Allowance 30 $ 24  
Loans modified in TDRs that experienced a payment default      
Current 3,013,660   2,739,448
Total loans and leases 3,025,345   2,743,242
Commercial real estate      
Loans modified in TDRs that experienced a payment default      
Current 3,395,347   3,460,121
Total loans and leases 3,413,014   3,463,953
Lease financing      
Loans modified in TDRs that experienced a payment default      
Current 236,623   202,483
Total loans and leases $ 236,623   202,483
Residential      
Troubled debt restructuring modifications      
Period of time monthly payments are lowered to accommodate borrowers' financial needs 2 years    
Number of Contracts | contract   1  
Recorded Investment   $ 352  
Related Allowance   $ 14  
Loans modified in TDRs that experienced a payment default      
Total loans and leases     $ 4,662,175
Residential | Real estate property held from foreclosed TDR      
Loans modified in TDRs that experienced a payment default      
Number of real estate properties | loan 1   2
Real estate property held from a foreclosed TDR $ 200   $ 300
Consumer      
Loans modified in TDRs that experienced a payment default      
Total loans and leases $ 1,568,073   1,620,556
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 $ 563,385   516,874
Total loans and leases $ 572,062   $ 519,241
Residential Mortgage.      
Loans modified in TDRs that experienced a payment default      
Number of residential mortgage loans collateralized by real estate property and modified in a TDR in the process of foreclosure | contract 1   1
Residential mortgage loans collateralized by real estate property and modified in a TDR in the process of foreclosure $ 300   $ 300
Commitments to extend credit      
Troubled debt restructuring modifications      
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit 5,727,850   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 185,315   181,412
Commercial Letters of credit      
Troubled debt restructuring modifications      
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit $ 8,850   $ 7,334