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Allowance for Loan and Lease Losses - Troubled Debt Restructuring Modifications (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
contract
property
Dec. 31, 2018
USD ($)
contract
property
Dec. 31, 2017
USD ($)
contract
Troubled debt restructuring modifications      
Number of Contracts | contract 3 4 3
Recorded Investment $ 1,180 $ 1,244 $ 1,734
Related Allowance 25 39 $ 23
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit 6,100,000 5,800,000  
Commitments related to borrowers who had loan terms modified in a TDR $ 4,500 $ 1,800  
Loans modified in TDRs that experienced a payment default      
Period past due for payment default 30 days    
Number of contracts | contract 2   2
Recorded Investment $ 571   $ 3,873
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  
Commercial and Industrial      
Troubled debt restructuring modifications      
Number of Contracts | contract 2 1 1
Recorded Investment $ 571 $ 369 $ 1,075
Related Allowance $ 25 $ 10  
Loans modified in TDRs that experienced a payment default      
Number of contracts | contract 2   1
Recorded Investment $ 571   $ 2,480
Commercial real estate      
Loans modified in TDRs that experienced a payment default      
Number of contracts | contract     1
Recorded Investment     $ 1,393
Lease financing      
Troubled debt restructuring modifications      
Short-term forbearance period after which missed payments are added to end of lease term 3 months    
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 2
Recorded Investment $ 609 $ 875 $ 659
Related Allowance   $ 29 $ 23
Residential | Real estate property held from foreclosed TDR      
Loans modified in TDRs that experienced a payment default      
Number of real estate properties | property 2 1  
Real estate property held from a foreclosed TDR $ 300 $ 800  
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    
Home equity line | Real estate property held from foreclosed TDR      
Loans modified in TDRs that experienced a payment default      
Number of real estate properties | property 1    
Commitments to extend credit      
Troubled debt restructuring modifications      
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit $ 5,907,690 5,549,591  
Standby letters of credit      
Troubled debt restructuring modifications      
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit 181,412 204,324  
Commercial Letters of credit      
Troubled debt restructuring modifications      
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit $ 7,334 $ 7,535