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Loans, net and allowance for credit losses - Allocation of Allowance for Loan Losses and Related Loans by Major Classification of Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Allowance for loan losses:
Beginning Balance	$ 22,597	$ 25,444	$ 21,895	$ 27,472	$ 27,472
Charge-offs	(135)	(77)	(243)	(152)
Recoveries	65	52	167	118
Provisions (credits)	596	(2,201)	1,304	(937)
Ending balance	23,123	23,218	23,123	23,218	21,895
Ending balance: individually evaluated for impairment	422		422		31
Ending balance: collectively evaluated for impairment	22,701		22,701		21,864
Loans receivable:
Loans			243		3,025
Loans	2,869,553		2,869,553		2,849,897
Ending balance: collectively evaluated for impairment	2,862,702		2,862,702		2,845,157
Cumulative impact of adoption | ASC 326
Allowance for loan losses:
Beginning Balance				(3,283)	(3,283)
Ending balance
Real estate
Loans receivable:
Ending balance: individually evaluated for impairment	6,844		6,844		4,730
Non-real estate
Loans receivable:
Ending balance: individually evaluated for impairment	7		7		10
Commercial
Allowance for loan losses:
Beginning Balance	2,287	2,481	2,272	4,365	4,365
Charge-offs	(41)		(46)	(4)
Recoveries	25	5	80	5
Provisions (credits)	(100)	265	(135)	68
Ending balance	2,171	2,751	2,171	2,751	2,272
Ending balance: individually evaluated for impairment	7		7		10
Ending balance: collectively evaluated for impairment	2,164		2,164		2,262
Loans receivable:
Loans			46		58
Loans	461,014		461,014		368,411
Ending balance: collectively evaluated for impairment	460,629		460,629		368,394
Commercial | Cumulative impact of adoption | ASC 326
Allowance for loan losses:
Beginning Balance				(1,683)	(1,683)
Ending balance
Commercial | Real estate
Loans receivable:
Ending balance: individually evaluated for impairment	378		378		7
Commercial | Non-real estate
Loans receivable:
Ending balance: individually evaluated for impairment	7		7		10
Municipal
Allowance for loan losses:
Beginning Balance	698	2,318	788	1,247	1,247
Provisions (credits)	13	(1,491)	(77)	(1,167)
Ending balance	711	827	711	827	788
Ending balance: collectively evaluated for impairment	711		711		788
Loans receivable:
Loans	170,991		170,991		175,304
Ending balance: collectively evaluated for impairment	170,991		170,991		175,304
Municipal | Cumulative impact of adoption | ASC 326
Allowance for loan losses:
Beginning Balance				747	747
Ending balance
Commercial real estate
Allowance for loan losses:
Beginning Balance	14,470	15,692	14,153	17,915	17,915
Recoveries				1
Provisions (credits)	686	(731)	1,003	389
Ending balance	15,156	14,961	15,156	14,961	14,153
Ending balance: individually evaluated for impairment	415		415		21
Ending balance: collectively evaluated for impairment	14,741		14,741		14,132
Loans receivable:
Loans					2,598
Loans	1,793,652		1,793,652		1,863,118
Ending balance: collectively evaluated for impairment	1,788,513		1,788,513		1,860,144
Commercial real estate | Cumulative impact of adoption | ASC 326
Allowance for loan losses:
Beginning Balance				(3,344)	(3,344)
Ending balance
Commercial real estate | Real estate
Loans receivable:
Ending balance: individually evaluated for impairment	5,139		5,139		2,974
Residential real estate
Allowance for loan losses:
Beginning Balance	4,258	3,868	3,782	3,072	3,072
Recoveries	2	3	4	19
Provisions (credits)	(30)	(104)	444	(291)
Ending balance	4,230	3,767	4,230	3,767	3,782
Ending balance: collectively evaluated for impairment	4,230		4,230		3,782
Loans receivable:
Loans	369,671		369,671		360,803
Ending balance: collectively evaluated for impairment	368,344		368,344		359,054
Residential real estate | Cumulative impact of adoption | ASC 326
Allowance for loan losses:
Beginning Balance				967	967
Ending balance
Residential real estate | Real estate
Loans receivable:
Ending balance: individually evaluated for impairment	1,327		1,327		1,749
Consumer
Allowance for loan losses:
Beginning Balance	884	1,085	900	873	873
Charge-offs	(94)	(77)	(197)	(148)
Recoveries	38	44	83	93
Provisions (credits)	27	(140)	69	64
Ending balance	855	$ 912	855	912	900
Ending balance: collectively evaluated for impairment	855		855		900
Loans receivable:
Loans			197		369
Loans	74,225		74,225		82,261
Ending balance: collectively evaluated for impairment	$ 74,225		$ 74,225		82,261
Consumer | Cumulative impact of adoption | ASC 326
Allowance for loan losses:
Beginning Balance				$ 30	$ 30
Ending balance

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