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Allowance for Loan and Lease Losses - Loans Modified in Troubled Debt Restructuring (Details) - Originated Loans and Leases
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 2 2 4 4
Pre-Modification Outstanding Recorded Investment $ 1,586 $ 115 $ 2,349 $ 227
Post-Modification Outstanding Recorded Investment $ 1,586 $ 115 $ 2,349 $ 227
Number of Loans | loan 1 0 1 0
Post-Modification Outstanding Recorded Investment $ 93 $ 0 $ 93 $ 0
Commercial and industrial | Commercial and industrial, real estate other        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 1   2  
Pre-Modification Outstanding Recorded Investment $ 9   $ 604  
Post-Modification Outstanding Recorded Investment $ 9   $ 604  
Number of Loans | loan 0   0  
Post-Modification Outstanding Recorded Investment $ 0   $ 0  
Commercial real estate | Commercial and industrial, real estate other        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 1   1  
Pre-Modification Outstanding Recorded Investment $ 1,577   $ 1,577  
Post-Modification Outstanding Recorded Investment $ 1,577   $ 1,577  
Number of Loans | loan 0   0  
Post-Modification Outstanding Recorded Investment $ 0   $ 0  
Residential real estate | Home equity        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Loans | loan 0 2 1 4
Pre-Modification Outstanding Recorded Investment $ 0 $ 115 $ 168 $ 227
Post-Modification Outstanding Recorded Investment $ 0 $ 115 $ 168 $ 227
Number of Loans | loan 1 0 1 0
Post-Modification Outstanding Recorded Investment $ 93 $ 0 $ 93 $ 0