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Allowance for Loan Losses - Activity by Class (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2021
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 15,521		$ 16,253	$ 16,253
Charge offs	247		279	748
Recoveries	42		95	391
Provision (credit)	450	$ (1,950)	525	(375)
Ending balance	15,766	15,521	16,594	15,521
Ending balance specifically evaluated for impairment	712	576	900	576
Ending balance collectively evaluated for impairment	15,054	14,945	15,694	14,945
Ending balance	1,707,348	1,647,649	1,516,772	1,647,649
Ending balance specifically evaluated for impairment	11,254	12,052	16,340	12,052
Ending balance collectively evaluated for impairment	1,696,094	1,635,597	1,500,432	1,635,597
Commercial |    Real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,367		5,178	5,178
Charge offs	0		5	106
Recoveries	16		65	95
Provision (credit)	(14)		503	200
Ending balance	5,369	5,367	5,741	5,367
Ending balance specifically evaluated for impairment	42	42	174	42
Ending balance collectively evaluated for impairment	5,327	5,325	5,567	5,325
Ending balance	588,301	576,198	469,974	576,198
Ending balance specifically evaluated for impairment	1,775	1,428	3,201	1,428
Ending balance collectively evaluated for impairment	586,526	574,770	466,773	574,770
Commercial |    Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	746		662	662
Charge offs	0		0	0
Recoveries	0		0	0
Provision (credit)	193		(13)	84
Ending balance	939	746	649	746
Ending balance specifically evaluated for impairment	13	16	21	16
Ending balance collectively evaluated for impairment	926	730	628	730
Ending balance	102,982	79,365	53,394	79,365
Ending balance specifically evaluated for impairment	688	689	770	689
Ending balance collectively evaluated for impairment	102,294	78,676	52,624	78,676
Commercial |    Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,830		3,438	3,438
Charge offs	1		142	288
Recoveries	1		0	84
Provision (credit)	126		784	(404)
Ending balance	2,956	2,830	4,080	2,830
Ending balance specifically evaluated for impairment	532	381	563	381
Ending balance collectively evaluated for impairment	2,424	2,449	3,517	2,449
Ending balance	267,666	264,570	297,488	264,570
Ending balance specifically evaluated for impairment	1,233	1,303	2,220	1,303
Ending balance collectively evaluated for impairment	266,433	263,267	295,268	263,267
Municipal
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	157		171	171
Charge offs	0		0	0
Recoveries	0		0	0
Provision (credit)	(1)		14	(14)
Ending balance	156	157	185	157
Ending balance specifically evaluated for impairment	0	0	0	0
Ending balance collectively evaluated for impairment	156	157	185	157
Ending balance	50,867	48,362	49,476	48,362
Ending balance specifically evaluated for impairment	0	0	0	0
Ending balance collectively evaluated for impairment	50,867	48,362	49,476	48,362
Residential |    Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	148		102	102
Charge offs	0		0	0
Recoveries	0		0	0
Provision (credit)	13		29	46
Ending balance	161	148	131	148
Ending balance specifically evaluated for impairment	0	0	0	0
Ending balance collectively evaluated for impairment	161	148	131	148
Ending balance	36,272	31,763	24,796	31,763
Ending balance specifically evaluated for impairment	0	0	0	0
Ending balance collectively evaluated for impairment	36,272	31,763	24,796	31,763
Residential |    Term
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,733		2,579	2,579
Charge offs	0		29	42
Recoveries	8		6	66
Provision (credit)	(93)		406	130
Ending balance	2,648	2,733	2,962	2,733
Ending balance specifically evaluated for impairment	118	137	142	137
Ending balance collectively evaluated for impairment	2,530	2,596	2,820	2,596
Ending balance	566,320	550,783	520,317	550,783
Ending balance specifically evaluated for impairment	7,266	8,173	9,267	8,173
Ending balance collectively evaluated for impairment	559,054	542,610	511,050	542,610
Home equity line of credit
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	925		1,211	1,211
Charge offs	29		0	0
Recoveries	1		1	61
Provision (credit)	42		(265)	(347)
Ending balance	939	925	947	925
Ending balance specifically evaluated for impairment	7	0	0	0
Ending balance collectively evaluated for impairment	932	925	947	925
Ending balance	72,863	73,632	77,210	73,632
Ending balance specifically evaluated for impairment	291	457	875	457
Ending balance collectively evaluated for impairment	72,572	73,175	76,335	73,175
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	833		778	778
Charge offs	217		103	312
Recoveries	16		23	85
Provision (credit)	234		174	282
Ending balance	866	833	872	833
Ending balance specifically evaluated for impairment	0	0	0	0
Ending balance collectively evaluated for impairment	866	833	872	833
Ending balance	22,077	22,976	24,117	22,976
Ending balance specifically evaluated for impairment	1	2	7	2
Ending balance collectively evaluated for impairment	22,076	22,974	24,110	22,974
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,782		2,134	2,134
Charge offs	0		0	0
Recoveries	0		0	0
Provision (credit)	(50)		(1,107)	(352)
Ending balance	1,732	1,782	1,027	1,782
Ending balance specifically evaluated for impairment	0	0	0	0
Ending balance collectively evaluated for impairment	1,732	1,782	1,027	1,782
Ending balance	0	0	0	0
Ending balance specifically evaluated for impairment	0	0	0	0
Ending balance collectively evaluated for impairment	$ 0	$ 0	$ 0	$ 0

X

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount excluding accrued interest, of allowance for credit loss on financing receivable.

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