CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Activities
Net income	$ 11,136	$ 8,824	$ 6,256
(Accretion), amortization and depreciation
Securities	332	31	145
Bank premises and equipment	1,591	1,668	1,441
Core deposit intangible	388	454	533
Modification fees on Federal Home Loan Bank of Boston advances	232	232	234
Subordinated debt issuance costs	24	24	23
Mortgage servicing rights	51	48	169
Fair value adjustment on loans	(64)	(779)	(1,207)
Fair value adjustment on deposits	(8)	(37)	(78)
(Gains) and losses, including write-downs on sales and calls of securities available-for-sale, net	(263)	(318)	(178)
(Gains) and losses, including write-downs on sales of loans, excluding capitalized servicing rights	(82)	(71)	(95)
(Gains) and losses, including write-downs on CRA Mutual Fund	(25)	18
(Gains) and losses, including write-downs of other real estate owned	408	274	1,717
(Gains) and losses, including write-downs on sale/disposals of premises and equipment		85	1
Gain from BOLI		(341)
Provision for loan losses	955	1,728	1,020
Proceeds from loans sold	6,447	4,555	5,440
Loans originated for sale	(6,697)	(3,815)	(6,014)
Decrease (increase) in deferred loan origination fees and costs, net	59	(132)	(42)
Mortgage servicing rights originated	(61)	(43)	(63)
Decrease in mortgage servicing rights impairment reserve			(23)
Increase in interest receivable	(267)	(478)	(229)
Deferred tax (benefit) expense	(391)	(494)	888
(Increase) decrease in prepaid expenses	(174)	(50)	123
Increase in cash surrender value of life insurance policies	(392)	(337)	(343)
Decrease (increase) in income tax receivable	137	760	(173)
Increase in income tax payable	235
Decrease in other assets	846	48	790
Increase (decrease) in accrued expenses	352	769	(643)
(Decrease) increase in interest payable	(159)	138	10
(Decrease) increase in other liabilities	(835)	69	240
Stock based compensation - restricted stock awards	556	447	265
Net cash provided by operating activities	14,330	13,277	10,207
Investing Activities
Redemptions (purchases) of Federal Home Loan Bank of Boston stock, net	1,254	(683)	(602)
Purchases of securities available-for-sale	(53,467)	(41,631)	(36,654)
Purchases of interest bearing time deposits with financial institutions	(750)
Proceeds from sales of securities available-for-sale	41,814	10,036	199
Proceeds from calls of securities available-for-sale	75	695	16,141
Proceeds from maturities of securities available-for-sale	13,521	17,061	20,427
Reinvestment of CRA Mutual Fund	(21)	(19)
Loan originations and principle collections, net	(19,172)	(102,273)	(32,536)
Recoveries of loans previously charged off	88	74	600
Proceeds from sales of other real estate owned	1,088	289	2,080
Capital expenditures	(2,055)	(1,393)	(1,954)
Investment in BOLI	(5,750)
Net cash and cash equivalents (paid) acquired in branch acquisition		(298)	22,396
Net cash utilized by investing activities	(23,375)	(118,142)	(9,903)
Financing Activities
Increase in deposit transaction accounts, net	26,722	58,658	7,578
(Decrease) increase in time deposits, net	(33,947)	44,300	(5,208)
Increase (decrease) in securities sold under agreements to repurchase, net	4,426	2,436	(3,867)
Short-term Federal Home Loan Bank of Boston advances, net	20,500	(17,500)	17,000
Long-term Federal Home Loan Bank of Boston advances, net	(37,000)	30,000
Principal payments on note payable	(34)	(33)	(31)
Decrease in finance lease obligation	(109)	(127)	(59)
Stock options exercised	82	222	316
Issuance of shares for directors' fees		1	81
Common stock dividends paid	(3,155)	(3,133)	(3,113)
Net cash (applied to) provided by financing activities	(22,515)	114,824	12,697
Net (decrease) increase in cash and cash equivalents	(31,560)	9,959	13,001
Cash and cash equivalents, beginning of year	58,445	48,486	35,485
Cash and cash equivalents, end of year	26,885	58,445	48,486
Cash paid during year
Interest	9,212	6,864	4,049
Income taxes	2,378	1,443	2,291
Non-cash transfers
From loans to other real estate owned		1,654	743
Finance Lease Obligation		1,373
Finance Lease Paid-off
Fixed Asset	(1,158)
Lease liability	1,254
Deferred gain applied to bank premises and equipment	(96)
Transfer of unearned credit-related discount to allowance for loan losses	663
Adoption of new accounting principle - Other assets	1,552
Adoption of new accounting principle - Other liabilities	(1,552)
Adoption of new accounting principle		16
BOLI proceeds included in other assets		621
Branch acquisition
Cash and cash equivalents (paid) acquired		(298)	22,387
Net loans acquired		7,849	7,097
Fixed assets acquired (including capital leases)		761	1,605
Accrued interest receivable acquired		5	12
Other assets acquired		6	20
Core deposit intangible			633
Goodwill			1,263
Deposits assumed		8,323	31,433
Capital lease assumed			1,476
Other liabilities assumed			$ 3