CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest and dividend income
Interest and fees on loans	$ 39,742	$ 37,072	$ 33,090
Interest on debt securities
Taxable	2,223	2,231	1,566
Tax exempt	545	136	380
Other interest and dividends	903	933	485
Total interest and dividend income	43,413	40,372	35,521
Interest expense
Deposits	7,324	4,656	2,483
Repurchase agreements	24	12	5
Finance lease	170	178	96
Note payable	16	18	18
Subordinated debt	624	624	624
Federal Home Loan Bank of Boston advances	1,143	1,733	1,012
Total interest expense	9,301	7,221	4,238
Net interest and dividend income	34,112	33,151	31,283
Provision for loan losses	955	1,728	1,020
Net interest and dividend income after provision for loan losses	33,157	31,423	30,263
Non-interest income
Trust and wealth advisory	3,995	3,700	3,477
Service charges and fees	4,028	3,718	3,718
Gains on sales of mortgage loans, net	116	89	125
Mortgage servicing, net	307	308	255
Gains (Losses) on CRA mutual fund	25	(18)
Gains on securities, net	263	318	178
BOLI income and gains	392	678	343
Other	124	152	140
Total non-interest income	9,250	8,945	8,236
Non-interest expense
Salaries	12,048	12,003	11,135
Employee benefits	4,384	4,280	3,767
Premises and equipment	4,016	4,535	3,831
Data processing	2,201	2,119	2,057
Professional fees	2,213	2,236	2,499
OREO gains, losses and write-downs, net	408	275	1,716
Collections, OREO, and appraisals	436	578	463
FDIC insurance	261	579	497
Marketing and community support	619	815	793
Amortization of intangibles	388	454	533
Other	1,938	1,961	2,038
Total non-interest expense	28,912	29,835	29,329
Income before income taxes	13,495	10,533	9,170
Income tax provision	2,359	1,709	2,914
Net income	11,136	8,824	6,256
Net income allocated to common stock	$ 10,976	$ 8,713	$ 6,201
Basic earnings per common share	$ 3.95	$ 3.15	$ 2.25
Weighted average common shares outstanding, to calculate basic earnings per share	2,782	2,763	2,755
Diluted earnings per common share	$ 3.93	$ 3.13	$ 2.24
Weighted average common shares outstanding, to calculate diluted earnings per share	2,794	2,780	2,774
Common dividends per share	$ 1.12	$ 1.12	$ 1.12