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Allowance for Loan and Lease Losses - Loans by Class Modified as Troubled Debt Restructurings (Details) - Originated Loans and Leases
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 7 6
Pre-Modification Outstanding Recorded Investment $ 533 $ 716
Post- Modification Outstanding Recorded Investment $ 533 $ 716
Number of Loans TDRs | loan 0 1
Post- Modification Outstanding Recorded Investment TDRs $ 0 $ 55
Commercial real estate | Other    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 1  
Pre-Modification Outstanding Recorded Investment $ 26  
Post- Modification Outstanding Recorded Investment $ 26  
Number of Loans TDRs | loan 0  
Post- Modification Outstanding Recorded Investment TDRs $ 0  
Residential real estate | Home equity    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 6 6
Pre-Modification Outstanding Recorded Investment $ 507 $ 716
Post- Modification Outstanding Recorded Investment $ 507 $ 716
Number of Loans TDRs | loan 0 1
Post- Modification Outstanding Recorded Investment TDRs $ 0 $ 55