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Allowance for Loan and Lease Losses - Troubled Debt Restructuring Modifications (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
contract
property
Sep. 30, 2018
USD ($)
contract
Sep. 30, 2019
USD ($)
contract
property
Sep. 30, 2018
USD ($)
contract
Dec. 31, 2018
USD ($)
property
Troubled debt restructuring modifications          
Number of Contracts | contract 1 3 6 4  
Recorded Investment $ 609 $ 883 $ 1,545 $ 1,333  
Related Allowance   $ 30 39 $ 42  
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit 6,000,000   6,000,000   $ 5,800,000
Commitments related to borrowers who had loan terms modified in a TDR $ 1,300   $ 1,300   1,800
Loans modified in TDRs that experienced a payment default          
Period past due for payment default     30 days    
Number of contracts | contract 2   5 2  
Recorded Investment $ 588   $ 936 $ 254  
Commercial and Industrial          
Troubled debt restructuring modifications          
Number of Contracts | contract     4 1  
Recorded Investment     $ 588 $ 450  
Related Allowance     $ 26 $ 12  
Loans modified in TDRs that experienced a payment default          
Number of contracts | contract 2   4 2  
Recorded Investment $ 588   $ 588 $ 254  
Residential mortgage          
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 3  
Recorded Investment $ 609 $ 883 $ 957 $ 883  
Related Allowance   $ 30 $ 13 $ 30  
Loans modified in TDRs that experienced a payment default          
Number of contracts | contract     1    
Recorded Investment     $ 348    
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   $ 300
Residential mortgage | Real estate property held from foreclosed TDR          
Loans modified in TDRs that experienced a payment default          
Number of real estate properties | property 1   1   1
Real estate property held from a foreclosed TDR $ 100   $ 100   $ 800
Consumer | Minimum          
Troubled debt restructuring modifications          
Threshold period past due for charge-off 120 days   120 days    
Consumer | Maximum          
Troubled debt restructuring modifications          
Threshold period past due for charge-off 180 days   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 $ 5,814,078   $ 5,814,078   $ 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 183,992   183,992   204,324
Commercial Letters of credit          
Troubled debt restructuring modifications          
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit $ 5,024   $ 5,024   $ 7,535