CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Activities
Net income	$ 11,940	$ 11,136	$ 8,824
(Accretion), amortization and depreciation
Securities	548	332	31
Bank premises and equipment	1,426	1,591	1,668
Core deposit intangible	321	388	454
Amortization of modification fees on Federal Home Loan Bank of Boston advances	70	232	232
Subordinated debt issuance costs	24	24	24
Mortgage servicing rights	151	51	48
Fair value adjustment on loans		(64)	(779)
Fair value adjustment on deposits	(4)	(8)	(37)
(Gains) and losses, including write-downs
Sales and calls of securities available-for-sale, net	(196)	(263)	(318)
Sales of loans, excluding capitalized servicing rights	(1,204)	(82)	(71)
CRA Mutual Fund	(19)	(25)	18
Other real estate owned		408	275
Disposals of premises and equipment			85
Gain on redemption of bank owned life insurance	(601)		(341)
Provision for loan losses	5,038	955	1,728
Proceeds from loans sold	59,786	6,447	4,555
Loans originated for sale	(60,985)	(6,697)	(3,815)
Decrease (increase) in deferred loan origination fees and costs, net	1,734	59	(132)
Mortgage servicing rights originated	(534)	(61)	(43)
Increase in mortgage servicing rights impairment reserve	9
Increase in interest receivable	(2,958)	(267)	(478)
Deferred tax benefit	(1,600)	(391)	(494)
Decrease (increase) in prepaid expenses	393	(174)	(50)
Increase in cash surrender value of life insurance policies	(495)	(392)	(337)
Decrease in income tax receivable		137	760
Increase in income tax payable	83	235
(Increase) decrease in other assets	(52)	846	48
Increase in accrued expenses	327	352	769
(Decrease) increase in interest payable	(35)	(159)	138
(Decrease) increase in other liabilities	(107)	(835)	68
Stock based compensation-restricted stock awards	743	556	447
Net cash provided by operating activities	13,803	14,330	13,277
Investing Activities
Redemptions (purchases) of Federal Home Loan Bank of Boston stock, net	1,529	1,254	(683)
Purchases of securities available-for-sale	(37,392)	(53,467)	(41,631)
Purchases of interest-bearing time deposits with financial institutions		(750)
Proceeds from sales of securities available-for-sale	15,589	41,814	10,036
Proceeds from calls of securities available-for-sale	655	75	695
Proceeds from maturities of securities available-for-sale	16,270	13,521	17,061
Reinvestment of CRA Mutual Fund	(16)	(21)	(19)
Loan originations and principal collections, net	(107,420)	(19,172)	(102,273)
Recoveries of loans previously charged off	323	88	74
Proceeds from sales of other real estate owned	314	1,088	289
Capital expenditures	(4,367)	(2,055)	(1,393)
Purchase of bank owned life insurance	(3,500)	(5,750)
Death benefit proceeds received	3,994
Net cash and cash equivalents paid in branch acquisition			(298)
Net cash utilized by investing activities	(114,021)	(23,375)	(118,142)
Financing Activities
Increase in deposit transaction accounts, net	205,778	26,722	58,658
Increase (decrease) in time deposits, net	3,794	(33,947)	44,300
(Decrease) increase in securities sold under agreements to repurchase, net	(1,414)	4,426	2,436
Short-term Federal Home Loan Bank of Boston advances, net	(21,000)	20,500	(17,500)
Long-term Federal Home Loan Bank of Boston advances	6,000		37,000
Long-term Federal Home Loan Bank of Boston repayments	(30,000)	(37,000)	(7,000)
Amortizing Federal Home Loan Bank of Boston advances	10,000
Amortizing Federal Home Loan Bank of Boston repayments	(3,318)
Principal payments on note payable	(38)	(34)	(33)
Decrease in finance lease obligation	(74)	(109)	(127)
Stock options exercised	53	82	222
Issuance of shares for directors’ fees			1
Common stock dividends paid	(3,286)	(3,155)	(3,133)
Net cash provided by (applied to) financing activities	166,495	(22,515)	114,824
Net increase (decrease) in cash and cash equivalents	66,277	(31,560)	9,959
Cash and cash equivalents, beginning of year	26,885	58,445	48,486
Cash and cash equivalents, end of year	93,162	26,885	58,445
Cash paid during year
Interest	5,233	9,212	6,864
Income taxes	3,970	2,378	1,443
Non-cash transfers
From loans to other real estate owned			1,654
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 ASU 2016-02 - Other assets		1,552
Adoption of ASU 2016-02 - Other liabilities		(1,552)
Extension of operating lease-other assets	29
Extension of operating lease-other liabilities	(29)
Adoption of ASU 2016-01			16
BOLI proceeds included in other assets			621
Branch acquisition (1)
Cash and cash equivalents (paid) acquired			(298)
Net loans acquired			7,849
Fixed assets acquired (including capital leases)			761
Accrued interest receivable acquired			5
Other assets acquired			6
Deposits assumed			$ 8,323