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Allowance for Loan and Lease Losses - Troubled Debt Restructuring Modifications (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
property
contract
Dec. 31, 2017
USD ($)
property
contract
Dec. 31, 2016
USD ($)
contract
Troubled debt restructuring modifications      
Number of Contracts | contract 4 3 25
Recorded Investment $ 1,244 $ 1,734 $ 29,801
Related Allowance 39 23 $ 618
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit 5,800,000 5,600,000  
Commitments related to borrowers who had loan terms modified in a TDR $ 1,800 $ 1,900  
Loans modified in TDRs that experienced a payment default      
Period past due for payment default 30 days    
Number of contracts | contract   2 1
Recorded Investment   $ 3,873 $ 1,399
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 1 1 7
Recorded Investment $ 369 $ 1,075 $ 14,933
Related Allowance $ 10   $ 377
Loans modified in TDRs that experienced a payment default      
Number of contracts | contract   1  
Recorded Investment   $ 2,480  
Commercial Real Estate      
Troubled debt restructuring modifications      
Number of Contracts | contract     6
Recorded Investment     $ 9,709
Related Allowance     $ 7
Loans modified in TDRs that experienced a payment default      
Number of contracts | contract   1 1
Recorded Investment   $ 1,393 $ 1,399
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 3 2 12
Recorded Investment $ 875 $ 659 $ 5,159
Related Allowance $ 29 $ 23 $ 234
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 $ 800 $ 300  
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    
Commitments to extend credit      
Troubled debt restructuring modifications      
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit $ 5,549,591 5,401,763  
Standby letters of credit      
Troubled debt restructuring modifications      
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit 204,324 161,798  
Commercial Letters of credit      
Troubled debt restructuring modifications      
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit $ 7,535 $ 5,540