CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities
Net income	$ 16,473	$ 11,940	$ 11,136
(Accretion), amortization and depreciation
Securities	1,125	548	332
Bank premises and equipment	1,515	1,426	1,591
Core deposit intangible	256	321	388
Amortization of modification fees on Federal Home Loan Bank of Boston advances	22	70	232
Subordinated debt issuance costs	173	24	24
Mortgage servicing rights	235	151	51
Fair value adjustment on loans			(64)
Fair value adjustment on deposits		(4)	(8)
(Gains) and losses, including write-downs
Sales and calls of securities available-for-sale, net	2	(196)	(263)
Sales of loans, excluding capitalized servicing rights	(697)	(1,204)	(82)
CRA Mutual Fund	26	(19)	(25)
Other real estate owned			408
Disposals of premises and equipment	71
Gain on redemption of bank owned life insurance		(601)
(Release) provision for loan losses	(720)	5,038	955
Proceeds from loans sold	34,561	59,786	6,447
Loans originated for sale	(33,813)	(60,985)	(6,697)
(Increase) decrease in deferred loan origination fees and costs, net	(657)	1,734	59
Mortgage servicing rights originated	(314)	(534)	(61)
(Decrease) increase in mortgage servicing rights impairment reserve	(9)	9
Decrease (increase) in interest receivable	113	(2,958)	(267)
Deferred tax expense (benefit)	389	(1,600)	(391)
(Increase) decrease in prepaid expenses	(337)	393	(174)
Increase in cash surrender value of life insurance policies	(556)	(495)	(392)
(Increase) decrease in income tax receivable	(450)		137
(Decrease) increase in income tax payable	(320)	83	235
(Increase) decrease in other assets	(529)	(52)	846
Increase in accrued expenses	409	327	352
Increase (decrease) in interest payable	6	(35)	(159)
Increase (decrease) in other liabilities	144	(107)	(835)
Stock based compensation-restricted stock awards	930	743	556
Net cash provided by operating activities	18,048	13,803	14,330
Investing Activities
Redemptions (purchases) of Federal Home Loan Bank of Boston stock, net	316	1,529	1,254
Purchases of securities available-for-sale	(145,297)	(37,392)	(53,467)
Purchases of interest-bearing time deposits with financial institutions			(750)
Proceeds from sales of securities available-for-sale	3,311	15,589	41,814
Proceeds from calls of securities available-for-sale	9,500	655	75
Proceeds from maturities of securities available-for-sale	24,675	16,270	13,521
Reinvestment of CRA Mutual Fund	(10)	(16)	(21)
Loan originations and principal collections, net	(37,844)	(107,420)	(19,172)
Recoveries of loans previously charged off	209	323	88
Proceeds from sale/ disposal of premises and equipment	248
Proceeds from sales of other real estate owned		314	1,088
Capital expenditures	(2,314)	(4,367)	(2,055)
Purchase of bank owned life insurance	(6,000)	(3,500)	(5,750)
Death benefit proceeds received		3,994
Net cash utilized by investing activities	(153,206)	(114,021)	(23,375)
Financing Activities
Increase in deposit transaction accounts, net	219,624	205,778	26,722
(Decrease) increase in time deposits, net	(12,505)	3,794	(33,947)
(Increase) decrease in securities sold under agreements to repurchase, net	4,314	(1,414)	4,426
Short-term Federal Home Loan Bank of Boston advances, net		(21,000)	20,500
Long-term Federal Home Loan Bank of Boston advances		6,000
Long-term Federal Home Loan Bank of Boston repayments		(30,000)	(37,000)
Amortizing Federal Home Loan Bank of Boston advances		10,000
Amortizing Federal Home Loan Bank of Boston repayments	(5,005)	(3,318)
Issuance of Sub Debt, net of issuance costs	24,418
Repayment of Sub Debt	(10,000)
Principal payments on note payable	(38)	(38)	(34)
Decrease in finance lease obligation	(56)	(74)	(109)
Stock options exercised	31	53	82
Common stock dividends paid	(3,452)	(3,286)	(3,155)
Net cash provided by (applied to) financing activities	217,331	166,495	(22,515)
Net increase (decrease) in cash and cash equivalents	82,173	66,277	(31,560)
Cash and cash equivalents, beginning of year	93,162	26,885	58,445
Cash and cash equivalents, end of year	175,335	93,162	26,885
Cash paid during year
Interest	3,247	5,233	9,212
Income taxes	4,648	3,970	2,378
New Finance Lease
Fixed Asset	2,490		(1,158)
Lease liability	(2,490)		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)
Transfers from Fixed Assets to Other Assets	700
Extension of operating lease-other assets		29
Extension of operating lease-other liabilities		$ (29)