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Allowance for Loan and Lease Losses - Loans Modified in Troubled Debt Restructuring (Details) - Originated
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
loan
Mar. 31, 2019
USD ($)
loan
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Loans | loan 2 1
Pre-Modification Outstanding Recorded Investment $ 121 $ 168
Post-Modification Outstanding Recorded Investment $ 121 $ 168
Defaulted TDRs, Number of Loans | loan 2 0
Defaulted TDRs, Post-Modification Outstanding Recorded Investment $ 124 $ 0
Commercial real estate | Other    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Loans | loan 0  
Pre-Modification Outstanding Recorded Investment $ 0  
Post-Modification Outstanding Recorded Investment $ 0  
Defaulted TDRs, Number of Loans | loan 1  
Defaulted TDRs, Post-Modification Outstanding Recorded Investment $ 37  
Residential real estate | Home equity    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of Loans | loan 2 1
Pre-Modification Outstanding Recorded Investment $ 121 $ 168
Post-Modification Outstanding Recorded Investment $ 121 $ 168
Defaulted TDRs, Number of Loans | loan 1 0
Defaulted TDRs, Post-Modification Outstanding Recorded Investment $ 87 $ 0