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Allowance for Loan Losses (the Allowance) - Carrying value based on credit quality indicators (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Evaluated based on credit quality indicators |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | $ 1,246,114 | $ 1,205,751
Pass |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 1,138,361 | 1,124,015
Special mention |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 76,212 | 61,740
Substandard |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 31,541 | 16,316
Doubtful |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases |  | 3,680
Commercial mortgage | Evaluated based on credit quality indicators |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 542,473 | 485,103
Commercial mortgage | Pass |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 505,355 | 449,545
Commercial mortgage | Special mention |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 31,464 | 32,059
Commercial mortgage | Substandard |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 5,654 | 3,499
Home equity lines and loans | Evaluated based on credit quality indicators |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 52,819 | 64,987
Home equity lines and loans | Pass |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 51,427 | 63,923
Home equity lines and loans | Substandard |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 1,392 | 1,064
Construction | Evaluated based on credit quality indicators |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 162,192 | 140,246
Construction | Pass |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 153,200 | 132,286
Construction | Special mention |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 8,992 | 7,960
Commercial and industrial | Evaluated based on credit quality indicators |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 278,976 | 261,750
Commercial and industrial | Pass |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 222,041 | 227,349
Commercial and industrial | Special mention |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 35,756 | 21,721
Commercial and industrial | Substandard |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 21,179 | 9,000
Commercial and industrial | Doubtful |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases |  | 3,680
Small business loans | Evaluated based on credit quality indicators |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 90,477 | 49,542
Small business loans | Pass |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 87,161 | 46,789
Small business loans | Substandard |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 3,316 | 2,753
Paycheck Protection Program loans ("PPP") | Evaluated based on credit quality indicators |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 118,585 | 203,543
Paycheck Protection Program loans ("PPP") | Pass |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 118,585 | 203,543
MainStreet Lending Program Loans ("PPP") | Evaluated based on credit quality indicators |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | 592 | 580
MainStreet Lending Program Loans ("PPP") | Pass |  |
Loans and Leases by Credit Ratings |  |
Carry value of loans and leases excluding residential mortgage, consumer and leases | $ 592 | $ 580

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