Allowance for Credit Losses - Allowance for credit loss on loans and leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Allowance for Credit Losses
Beginning balance	$ 3,150	$ 3,224	$ 3,224	$ 3,338
Charge-offs	(44)	(40)	(222)	(427)
Recoveries	25	17	189	580
Net provision for loan losses	(40)	0	(100)	(280)
Ending Balance	3,091	3,201	3,091	3,201
Provision for losses on unfunded commitments	(48)	22	(48)	(275)
Total allowance for credit losses on loans and unfunded commitments	3,091	3,278	3,091	3,278
Individually evaluated	11	51	11	51
Collectively evaluated	3,080	3,150	3,080	3,150
Individually evaluated	1,790	933	1,790	933
Collectively evaluated	237,469	228,749	237,469	228,749
Total	239,259	229,682	239,259	229,682	$ 238,339
Reserve for unfunded lending commitments
Allowance for Credit Losses
Beginning balance	115	55	55	0
Ending Balance	107	77	107	77
Provision for losses on unfunded commitments	(8)	22	52	5
Total allowance for credit losses on loans and unfunded commitments	3,198	3,278	3,198	3,278
Individually evaluated	0	0	0	0
Collectively evaluated	107	77	107	77
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13
Allowance for Credit Losses
Beginning balance				(10)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Reserve for unfunded lending commitments
Allowance for Credit Losses
Beginning balance				72
Real estate, residential
Allowance for Credit Losses
Beginning balance	781	649	971	913
Charge-offs	(11)	0	(57)	0
Recoveries	0	0	55	0
Net provision for loan losses	(73)	361	(272)	(299)
Ending Balance	697	1,010	697	1,010
Total allowance for credit losses on loans and unfunded commitments	697	1,015	697	1,015
Individually evaluated	0	44	0	44
Collectively evaluated	697	966	697	966
Individually evaluated	1,064	726	1,064	726
Collectively evaluated	80,383	72,299	80,383	72,299
Total	81,447	73,025	81,447	73,025	74,296
Real estate, residential | Reserve for unfunded lending commitments
Allowance for Credit Losses
Beginning balance	2	6	2	0
Ending Balance	3	5	3	5
Provision for losses on unfunded commitments	1	(1)	1	1
Total allowance for credit losses on loans and unfunded commitments	700	1,015	700	1,015
Individually evaluated	0	0	0	0
Collectively evaluated	3	5	3	5
Real estate, residential | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13
Allowance for Credit Losses
Beginning balance				396
Real estate, residential | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Reserve for unfunded lending commitments
Allowance for Credit Losses
Beginning balance				4
Real estate, construction
Allowance for Credit Losses
Beginning balance	203	217	173	392
Charge-offs	0	0	0	0
Recoveries	9	0	29	0
Net provision for loan losses	(27)	(33)	(17)	(150)
Ending Balance	185	184	185	184
Total allowance for credit losses on loans and unfunded commitments	185	232	185	232
Individually evaluated	0	0	0	0
Collectively evaluated	185	184	185	184
Individually evaluated	203	92	203	92
Collectively evaluated	23,036	26,815	23,036	26,815
Total	23,239	26,907	23,239	26,907	27,353
Real estate, construction | Reserve for unfunded lending commitments
Allowance for Credit Losses
Beginning balance	44	38	34	0
Ending Balance	39	48	39	48
Provision for losses on unfunded commitments	(5)	10	5	18
Total allowance for credit losses on loans and unfunded commitments	224	232	224	232
Individually evaluated	0	0	0	0
Collectively evaluated	39	48	39	48
Real estate, construction | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13
Allowance for Credit Losses
Beginning balance				(58)
Real estate, construction | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Reserve for unfunded lending commitments
Allowance for Credit Losses
Beginning balance				30
Real estate, nonresidential
Allowance for Credit Losses
Beginning balance	1,857	2,144	1,807	1,639
Charge-offs	0	0	0	(270)
Recoveries	1	0	3	487
Net provision for loan losses	(11)	(334)	37	169
Ending Balance	1,847	1,810	1,847	1,810
Total allowance for credit losses on loans and unfunded commitments	1,847	1,814	1,847	1,814
Individually evaluated	0	0	0	0
Collectively evaluated	1,847	1,810	1,847	1,810
Individually evaluated	464	103	464	103
Collectively evaluated	111,525	110,468	111,525	110,468
Total	111,989	110,571	111,989	110,571	115,014
Real estate, nonresidential | Reserve for unfunded lending commitments
Allowance for Credit Losses
Beginning balance	12	4	5	0
Ending Balance	11	4	11	4
Provision for losses on unfunded commitments	(1)	0	6	(1)
Total allowance for credit losses on loans and unfunded commitments	1,858	1,814	1,858	1,814
Individually evaluated	0	0	0	0
Collectively evaluated	11	4	11	4
Real estate, nonresidential | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13
Allowance for Credit Losses
Beginning balance				(215)
Real estate, nonresidential | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Reserve for unfunded lending commitments
Allowance for Credit Losses
Beginning balance				5
Commercial and industrial
Allowance for Credit Losses
Beginning balance	74	67	54	143
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Net provision for loan losses	6	(16)	26	(8)
Ending Balance	80	51	80	51
Total allowance for credit losses on loans and unfunded commitments	80	64	80	64
Individually evaluated	0	0	0	0
Collectively evaluated	80	51	80	51
Individually evaluated	23	0	23	0
Collectively evaluated	12,113	10,831	12,113	10,831
Total	12,136	10,831	12,136	10,831	12,496
Commercial and industrial | Reserve for unfunded lending commitments
Allowance for Credit Losses
Beginning balance	11	0	10	0
Ending Balance	12	13	12	13
Provision for losses on unfunded commitments	1	13	2	(2)
Total allowance for credit losses on loans and unfunded commitments	92	64	92	64
Individually evaluated	0	0	0	0
Collectively evaluated	12	13	12	13
Commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13
Allowance for Credit Losses
Beginning balance				(84)
Commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Reserve for unfunded lending commitments
Allowance for Credit Losses
Beginning balance				15
Other
Allowance for Credit Losses
Beginning balance	235	147	219	251
Charge-offs	(33)	(40)	(165)	(157)
Recoveries	15	17	102	93
Net provision for loan losses	65	22	126	8
Ending Balance	282	146	282	146
Total allowance for credit losses on loans and unfunded commitments	282	153	282	153
Individually evaluated	11	7	11	7
Collectively evaluated	271	139	271	139
Individually evaluated	36	12	36	12
Collectively evaluated	10,412	8,336	10,412	8,336
Total	10,448	8,348	10,448	8,348	$ 9,180
Other | Reserve for unfunded lending commitments
Allowance for Credit Losses
Beginning balance	46	7	4	0
Ending Balance	42	7	42	7
Provision for losses on unfunded commitments	(4)	0	38	(11)
Total allowance for credit losses on loans and unfunded commitments	324	153	324	153
Individually evaluated	0	0	0	0
Collectively evaluated	$ 42	$ 7	$ 42	7
Other | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13
Allowance for Credit Losses
Beginning balance				(49)
Other | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Reserve for unfunded lending commitments
Allowance for Credit Losses
Beginning balance				$ 18