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Allowance for Loan Losses (the Allowance) - Carrying value based on credit quality indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Evaluated based on credit quality indicators
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	$ 1,262,824	$ 1,205,751
Pass
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	1,185,276	1,124,015
Special mention
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	57,531	61,740
Substandard
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	16,407	16,316
Doubtful
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	3,610	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	517,421	485,103
Commercial mortgage | Pass
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	482,177	449,545
Commercial mortgage | Special mention
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	32,076	32,059
Commercial mortgage | Substandard
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	3,168	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	55,578	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	54,174	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	1,404	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	134,601	140,246
Construction | Pass
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	125,974	132,286
Construction | Special mention
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	8,627	7,960
Commercial and industrial, including leases | Evaluated based on credit quality indicators
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	261,421	261,750
Commercial and industrial, including leases | Pass
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	232,768	227,349
Commercial and industrial, including leases | Special mention
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	16,828	21,721
Commercial and industrial, including leases | Substandard
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	8,215	9,000
Commercial and industrial, including leases | Doubtful
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	3,610	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	62,373	49,542
Small business loans | Pass
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	58,753	46,789
Small business loans | Substandard
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	3,620	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	230,847	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	230,847	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	583	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	$ 583	$ 580

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- Definition

The balance of financing receivable excluding loans and leases carried at fair value and also excluding residential mortgage, consumer and leases.

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