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Allowance for Credit Losses - Loans Modified in Troubled Debt Restructuring (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
loan
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Number of Loans | loan 2
Pre- Modification Outstanding Recorded Investment $ 121
Post-Modification Outstanding Recorded Investment $ 121
Number of Loans | loan 2
Post- Modification Outstanding Recorded Investment $ 124
Commercial real estate | Commercial and industrial 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
Number of Loans | loan 1
Post- Modification Outstanding Recorded Investment $ 37
Residential real estate | Home equity  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Number of Loans | loan 2
Pre- Modification Outstanding Recorded Investment $ 121
Post-Modification Outstanding Recorded Investment $ 121
Number of Loans | loan 1
Post- Modification Outstanding Recorded Investment $ 87