Loans - Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	$ 488,439	$ 523,521	$ 488,439	$ 523,521	$ 703,501
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	642,728	826,878	642,728	826,878	792,838
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	677,452	542,761	677,452	542,761	519,887
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	455,599	362,766	455,599	362,766	344,185
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	295,161	178,279	295,161	178,279	164,593
Prior	626,667	582,392	626,667	582,392	548,654
Revolving Loans Amortized Cost Basis	153,891	122,020	153,891	122,020	139,250
Revolving Loan Converted to Term	0	0	0	0	0
Total	3,339,937	3,138,617	3,339,937	3,138,617	3,212,908
Current-period gross charge-offs
Total	1,429	1,204	4,562	3,812
Commercial
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	28,339	37,300	28,339	37,300	54,584
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	46,614	36,456	46,614	36,456	34,047
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	27,211	23,602	27,211	23,602	23,470
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	18,424	10,750	18,424	10,750	9,772
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	7,164	4,825	7,164	4,825	4,107
Prior	23,463	24,704	23,463	24,704	16,559
Revolving Loans Amortized Cost Basis	18,669	10,429	18,669	10,429	13,685
Revolving Loan Converted to Term	0	0	0	0	0
Total	169,884	148,066	169,884	148,066	156,224
Current-period gross charge-offs
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff			0	0	0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff			0	0	0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff			0	0	0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff			0	0	0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff			9	0	0
Prior			0	0	0
Revolving Loans Amortized Cost Basis			0	0	0
Revolving Loan Converted to Term			0	0	0
Total			9	0	0
Commercial Real Estate
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	49,229	57,761	49,229	57,761	81,732
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	90,965	170,163	90,965	170,163	171,426
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	150,282	107,813	150,282	107,813	107,035
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	111,833	124,558	111,833	124,558	123,378
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	119,625	42,624	119,625	42,624	42,197
Prior	230,172	229,151	230,172	229,151	217,555
Revolving Loans Amortized Cost Basis	4,314	2,534	4,314	2,534	2,164
Revolving Loan Converted to Term	0	0	0	0	0
Total	756,420	734,604	756,420	734,604	745,487
Current-period gross charge-offs
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff			0	0	0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff			0	0	0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff			0	0	0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff			0	0	0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff			0	0	0
Prior			0	0	0
Revolving Loans Amortized Cost Basis			0	0	0
Revolving Loan Converted to Term			0	0	0
Total			0	0	0
Consumer
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	298,154	322,193	298,154	322,193	405,307
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	326,159	385,232	326,159	385,232	356,000
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	271,082	216,796	271,082	216,796	196,350
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	139,622	107,935	139,622	107,935	93,918
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	58,299	53,714	58,299	53,714	44,287
Prior	26,448	21,309	26,448	21,309	15,337
Revolving Loans Amortized Cost Basis	477	458	477	458	468
Revolving Loan Converted to Term	0	0	0	0	0
Total	1,120,241	1,107,637	1,120,241	1,107,637	1,111,667
Current-period gross charge-offs
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff			1,125	192	366
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff			610	915	1,368
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff			1,365	1,689	2,122
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff			943	477	604
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff			278	299	397
Prior			191	234	266
Revolving Loans Amortized Cost Basis			0	0	0
Revolving Loan Converted to Term			0	0	0
Total	1,388	1,204	4,512	3,806	5,123
Residential
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	112,717	106,267	112,717	106,267	161,878
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	178,990	235,027	178,990	235,027	231,365
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	228,877	194,550	228,877	194,550	193,032
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	185,720	119,523	185,720	119,523	117,117
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	110,073	77,116	110,073	77,116	74,002
Prior	346,584	307,228	346,584	307,228	299,203
Revolving Loans Amortized Cost Basis	130,431	108,599	130,431	108,599	122,933
Revolving Loan Converted to Term	0	0	0	0	0
Total	1,293,392	1,148,310	1,293,392	1,148,310	1,199,530
Current-period gross charge-offs
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff			0	0	0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff			0	0	0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff			0	0	0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff			0	0	21
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff			0	0	0
Prior			41	6	33
Revolving Loans Amortized Cost Basis			0	0	0
Revolving Loan Converted to Term			0	0	0
Total	41	0	41	6	54
Satisfactory | Commercial
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	28,301	37,300	28,301	37,300	54,584
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	46,534	36,456	46,534	36,456	34,047
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	26,991	23,602	26,991	23,602	23,470
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	18,424	10,622	18,424	10,622	9,655
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	7,077	4,799	7,077	4,799	4,107
Prior	19,200	21,459	19,200	21,459	13,360
Revolving Loans Amortized Cost Basis	15,674	10,328	15,674	10,328	8,586
Revolving Loan Converted to Term	0	0	0	0	0
Total	162,201	144,566	162,201	144,566	147,809
Satisfactory | Commercial Real Estate
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	49,229	57,761	49,229	57,761	81,582
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	90,818	157,741	90,818	157,741	151,818
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	137,343	106,128	137,343	106,128	105,365
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	109,829	121,968	109,829	121,968	120,845
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	117,259	41,827	117,259	41,827	41,406
Prior	195,942	184,590	195,942	184,590	174,516
Revolving Loans Amortized Cost Basis	3,543	2,035	3,543	2,035	1,667
Revolving Loan Converted to Term	0	0	0	0	0
Total	703,963	672,050	703,963	672,050	677,199
Special mention | Commercial
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	38	0	38	0	0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	80	0	80	0	0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	220	0	220	0	0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	0	128	0	128	117
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	87	0	87	0	0
Prior	1,200	0	1,200	0	0
Revolving Loans Amortized Cost Basis	1,683	0	1,683	0	0
Revolving Loan Converted to Term	0	0	0	0	0
Total	3,308	128	3,308	128	117
Special mention | Commercial Real Estate
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	0	0	0	0	0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	0	3,123	0	3,123	10,439
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	12,764	0	12,764	0	0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	0	0	0	0	0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	0	0	0	0	0
Prior	11,003	4,150	11,003	4,150	4,084
Revolving Loans Amortized Cost Basis	0	0	0	0	0
Revolving Loan Converted to Term	0	0	0	0	0
Total	23,767	7,273	23,767	7,273	14,523
Substandard | Commercial
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	0	0	0	0	0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	0	0	0	0	0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	0	0	0	0	0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	0	0	0	0	0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	0	26	0	26	0
Prior	3,063	3,245	3,063	3,245	3,199
Revolving Loans Amortized Cost Basis	1,312	101	1,312	101	5,099
Revolving Loan Converted to Term	0	0	0	0	0
Total	4,375	3,372	4,375	3,372	8,298
Substandard | Commercial Real Estate
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	0	0	0	0	150
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	147	9,299	147	9,299	9,169
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	175	1,685	175	1,685	1,670
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	2,004	2,590	2,004	2,590	2,533
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	2,366	797	2,366	797	791
Prior	23,227	40,411	23,227	40,411	38,955
Revolving Loans Amortized Cost Basis	771	499	771	499	497
Revolving Loan Converted to Term	0	0	0	0	0
Total	28,690	55,281	28,690	55,281	53,765
Doubtful | Commercial
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	0	0	0	0	0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	0	0	0	0	0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	0	0	0	0	0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	0	0	0	0	0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	0	0	0	0	0
Prior	0	0	0	0	0
Revolving Loans Amortized Cost Basis	0	0	0	0	0
Revolving Loan Converted to Term	0	0	0	0	0
Total	0	0	0	0	0
Doubtful | Commercial Real Estate
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	0	0	0	0	0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	0	0	0	0	0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	0	0	0	0	0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	0	0	0	0	0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	0	0	0	0	0
Prior	0	0	0	0	0
Revolving Loans Amortized Cost Basis	0	0	0	0	0
Revolving Loan Converted to Term	0	0	0	0	0
Total	0	0	0	0	0
Performing | Consumer
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	298,014	322,084	298,014	322,084	405,099
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	325,751	384,607	325,751	384,607	355,217
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	270,669	216,234	270,669	216,234	195,799
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	139,101	107,743	139,101	107,743	93,708
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	58,060	53,646	58,060	53,646	44,206
Prior	26,417	21,276	26,417	21,276	15,252
Revolving Loans Amortized Cost Basis	477	0	477	0	0
Revolving Loan Converted to Term	0	0	0	0	0
Total	1,118,489	1,105,590	1,118,489	1,105,590	1,109,281
Performing | Residential
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	112,717	106,267	112,717	106,267	161,878
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	178,789	235,027	178,789	235,027	231,365
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	228,354	191,780	228,354	191,780	192,588
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	184,861	118,517	184,861	118,517	116,451
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	109,638	76,518	109,638	76,518	73,875
Prior	343,929	305,076	343,929	305,076	296,935
Revolving Loans Amortized Cost Basis	130,129	108,098	130,129	108,098	122,573
Revolving Loan Converted to Term	0	0	0	0	0
Total	1,288,417	1,141,283	1,288,417	1,141,283	1,195,665
Nonperforming | Consumer
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	140	109	140	109	208
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	408	625	408	625	783
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	413	562	413	562	551
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	521	192	521	192	210
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	239	68	239	68	81
Prior	31	33	31	33	85
Revolving Loans Amortized Cost Basis	0	458	0	458	468
Revolving Loan Converted to Term	0	0	0	0	0
Total	1,752	2,047	1,752	2,047	2,386
Nonperforming | Residential
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	0	0	0	0	0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	201	0	201	0	0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	523	2,770	523	2,770	444
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	859	1,006	859	1,006	666
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	435	598	435	598	127
Prior	2,655	2,152	2,655	2,152	2,268
Revolving Loans Amortized Cost Basis	302	501	302	501	360
Revolving Loan Converted to Term	0	0	0	0	0
Total	$ 4,975	$ 7,027	$ 4,975	$ 7,027	$ 3,865