Loans - Risk category of loans by class of loans (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Loans
Loans	$ 1,547,704	$ 1,291,428
Pass
Loans
Loans	1,519,094	1,256,950
Special Mention
Loans
Loans	6,250	4,885
Substandard
Loans
Loans	19,521	29,593
Doubtful
Loans
Loans	2,839
Commercial and industrial. | Commercial and industrial
Loans
Loans	251,293	268,508
Commercial and industrial. | Commercial and industrial | Pass
Loans
Loans	246,129	252,268
Commercial and industrial. | Commercial and industrial | Special Mention
Loans
Loans	609	4,156
Commercial and industrial. | Commercial and industrial | Substandard
Loans
Loans	1,716	12,084
Commercial and industrial. | Commercial and industrial | Doubtful
Loans
Loans	2,839
Commercial real estate. | Commercial real estate
Loans
Loans	1,059,821	852,707
Commercial real estate. | Commercial real estate | Pass
Loans
Loans	1,038,272	835,787
Commercial real estate. | Commercial real estate | Special Mention
Loans
Loans	5,641	679
Commercial real estate. | Commercial real estate | Substandard
Loans
Loans	15,908	16,241
Commercial real estate. | Commercial real estate construction
Loans
Loans	132,945	72,250
Commercial real estate. | Commercial real estate construction | Pass
Loans
Loans	132,945	72,250
Residential real estate. | Residential real estate
Loans
Loans	73,552	65,248
Residential real estate. | Residential real estate | Pass
Loans
Loans	71,815	64,094
Residential real estate. | Residential real estate | Substandard
Loans
Loans	1,737	1,154
Residential real estate. | Home equity
Loans
Loans	12,750	13,638
Residential real estate. | Home equity | Pass
Loans
Loans	12,697	13,588
Residential real estate. | Home equity | Special Mention
Loans
Loans		50
Residential real estate. | Home equity | Substandard
Loans
Loans	53
Consumer
Loans
Loans	17,343	19,077
Consumer | Pass
Loans
Loans	17,236	18,963
Consumer | Substandard
Loans
Loans	$ 107	$ 114