Quarterly report pursuant to Section 13 or 15(d)

Allowance for Loan and Lease Losses - Summary of Troubled Debt Restructurings (TDRs) Based Upon Delinquency Status (Details)

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Allowance for Loan and Lease Losses - Summary of Troubled Debt Restructurings (TDRs) Based Upon Delinquency Status (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Contract
Sep. 30, 2019
Contract
Sep. 30, 2020
USD ($)
Contract
Sep. 30, 2019
Contract
Dec. 31, 2019
USD ($)
Contract
Jun. 30, 2020
USD ($)
Financing Receivable Modifications [Line Items]            
Number of contracts     19   10  
Recorded Investment | $ $ 747   $ 747   $ 407  
Allowance attributable to TDRs | $         $ 113 $ 421
Commercial and Industrial Loans            
Financing Receivable Modifications [Line Items]            
Number of contracts   1 5 3    
Municipal and Other Loans            
Financing Receivable Modifications [Line Items]            
Number of contracts 1   1      
Performing TDRs            
Financing Receivable Modifications [Line Items]            
Number of contracts     6   5  
Recorded Investment | $ $ 249   $ 249   $ 209  
Performing TDRs | Commercial and Industrial Loans            
Financing Receivable Modifications [Line Items]            
Number of contracts     2   2  
Recorded Investment | $ 53   $ 53   $ 58  
Performing TDRs | Real Estate | 1-4 Single Family Residential Loans            
Financing Receivable Modifications [Line Items]            
Number of contracts     3   3  
Recorded Investment | $ 134   $ 134   $ 151  
Performing TDRs | Municipal and Other Loans            
Financing Receivable Modifications [Line Items]            
Number of contracts     1      
Recorded Investment | $ 62   $ 62      
Nonperforming TDRs            
Financing Receivable Modifications [Line Items]            
Number of contracts     13   5  
Recorded Investment | $ $ 498   $ 498   $ 198