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Allowance for Loan and Lease Losses - Troubled Debt Restructuring Modifications (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
property
contract
Mar. 31, 2018
USD ($)
contract
Dec. 31, 2018
USD ($)
property
contract
Troubled debt restructuring modifications      
Number of Contracts | contract 5    
Recorded Investment $ 1,268    
Related Allowance 38    
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit 5,700,000   $ 5,800,000
Commitments related to borrowers who had loan terms modified in a TDR $ 1,100   $ 1,800
Loans modified in TDRs that experienced a payment default      
Period past due for payment default 30 days    
Number of contracts | contract   2  
Recorded Investment   $ 564  
Commercial and Industrial      
Troubled debt restructuring modifications      
Number of Contracts | contract 4    
Recorded Investment $ 916    
Related Allowance $ 24    
Loans modified in TDRs that experienced a payment default      
Number of contracts | contract   2  
Recorded Investment   $ 564  
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      
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
Residential | Real estate property held from foreclosed TDR      
Loans modified in TDRs that experienced a payment default      
Number of real estate properties | property 1   1
Real estate property held from a foreclosed TDR $ 100   $ 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 $ 5,468,976   $ 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 186,321   204,324
Commercial Letters of credit      
Troubled debt restructuring modifications      
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit $ 9,602   $ 7,535