Loans - Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	$ 470,487		$ 470,487		$ 684,361
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	647,554		647,554		602,020
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	500,665		500,665		644,738
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	543,273		543,273		432,543
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	367,754		367,754		279,745
Prior	761,754		761,754		601,873
Revolving Loans Amortized Cost Basis	150,522		150,522		149,261
Revolving Loan Converted to Term	0		0		0
Total	3,442,009		3,442,009		3,394,541
Current-period gross charge-offs
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff			221		1,272
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff			1,080		949
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff			1,093		1,669
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff			912		1,270
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff			2,384		443
Prior			2,387		292
Revolving Loans Amortized Cost Basis			0		0
Revolving Loan Converted to Term			0		0
Total	1,464	$ 1,429	8,077	$ 4,562	5,895
Commercial
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	27,989		27,989		42,874
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	43,661		43,661		29,497
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	22,488		22,488		25,002
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	18,011		18,011		16,941
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	13,015		13,015		6,255
Prior	32,146		32,146		22,241
Revolving Loans Amortized Cost Basis	13,020		13,020		16,181
Revolving Loan Converted to Term	0		0		0
Total	170,330		170,330		158,991
Current-period gross charge-offs
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff			0		0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff			0		0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff			0		0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff			0		0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff			0		9
Prior			0		0
Revolving Loans Amortized Cost Basis			0		0
Revolving Loan Converted to Term			0		0
Total			0		9
Commercial Real Estate
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	47,297		47,297		93,051
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	118,505		118,505		97,129
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	94,461		94,461		149,998
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	146,696		146,696		111,071
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	105,492		105,492		117,885
Prior	291,308		291,308		223,561
Revolving Loans Amortized Cost Basis	5,937		5,937		3,670
Revolving Loan Converted to Term	0		0		0
Total	809,696		809,696		796,365
Current-period gross charge-offs
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff			0		0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff			0		0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff			0		0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff			0		0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff			1,656		0
Prior			2,162		0
Revolving Loans Amortized Cost Basis			0		0
Revolving Loan Converted to Term			0		0
Total			3,818		0
Consumer
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	290,509		290,509		386,349
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	309,552		309,552		298,122
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	217,920		217,920		244,086
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	166,268		166,268		122,396
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	75,650		75,650		48,446
Prior	28,878		28,878		19,109
Revolving Loans Amortized Cost Basis	456		456		473
Revolving Loan Converted to Term	0		0		0
Total	1,089,233		1,089,233		1,118,981
Current-period gross charge-offs
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff			221		1,272
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff			1,080		949
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff			1,093		1,669
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff			892		1,270
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff			728		434
Prior			194		243
Revolving Loans Amortized Cost Basis			0		0
Revolving Loan Converted to Term			0		0
Total	1,464	1,388	4,208	4,512	5,837
Residential
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	104,692		104,692		162,087
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	175,836		175,836		177,272
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	165,796		165,796		225,652
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	212,298		212,298		182,135
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	173,597		173,597		107,159
Prior	409,422		409,422		336,962
Revolving Loans Amortized Cost Basis	131,109		131,109		128,937
Revolving Loan Converted to Term	0		0		0
Total	1,372,750		1,372,750		1,320,204
Current-period gross charge-offs
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff			0		0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff			0		0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff			0		0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff			20		0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff			0		0
Prior			31		49
Revolving Loans Amortized Cost Basis			0		0
Revolving Loan Converted to Term			0		0
Total	0	$ 41	51	$ 41	49
Satisfactory | Commercial
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	27,494		27,494		42,767
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	43,661		43,661		28,988
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	21,989		21,989		23,808
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	17,751		17,751		16,941
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	13,015		13,015		6,183
Prior	29,216		29,216		19,211
Revolving Loans Amortized Cost Basis	11,032		11,032		15,686
Revolving Loan Converted to Term	0		0		0
Total	164,158		164,158		153,584
Satisfactory | Commercial Real Estate
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	46,994		46,994		90,049
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	113,780		113,780		96,783
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	93,842		93,842		137,146
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	133,133		133,133		109,086
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	100,394		100,394		115,576
Prior	272,312		272,312		187,202
Revolving Loans Amortized Cost Basis	3,972		3,972		2,799
Revolving Loan Converted to Term	0		0		0
Total	764,427		764,427		738,641
Special mention | Commercial
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	495		495		107
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	0		0		229
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	60		60		930
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	158		158		0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	0		0		72
Prior	0		0		0
Revolving Loans Amortized Cost Basis	478		478		483
Revolving Loan Converted to Term	0		0		0
Total	1,191		1,191		1,821
Special mention | Commercial Real Estate
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	303		303		3,002
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	4,725		4,725		200
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	276		276		12,680
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	12,422		12,422		0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	4,791		4,791		0
Prior	4,688		4,688		9,506
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total	27,205		27,205		25,388
Substandard | Commercial
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	0		0		0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	0		0		280
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	439		439		264
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	102		102		0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	0		0		0
Prior	2,930		2,930		3,030
Revolving Loans Amortized Cost Basis	1,510		1,510		12
Revolving Loan Converted to Term	0		0		0
Total	4,981		4,981		3,586
Substandard | Commercial Real Estate
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	0		0		0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	0		0		146
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	343		343		172
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	1,141		1,141		1,985
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	307		307		2,309
Prior	14,308		14,308		26,853
Revolving Loans Amortized Cost Basis	1,965		1,965		871
Revolving Loan Converted to Term	0		0		0
Total	18,064		18,064		32,336
Doubtful | Commercial
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	0		0		0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	0		0		0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	0		0		0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	0		0		0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	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
Doubtful | Commercial Real Estate
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	0		0		0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	0		0		0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	0		0		0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	0		0		0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	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
Performing | Consumer
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	290,403		290,403		386,004
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	309,091		309,091		297,698
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	217,438		217,438		243,484
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	166,014		166,014		121,803
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	75,359		75,359		48,268
Prior	28,792		28,792		18,994
Revolving Loans Amortized Cost Basis	456		456		473
Revolving Loan Converted to Term	0		0		0
Total	1,087,553		1,087,553		1,116,724
Performing | Residential
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	104,692		104,692		162,087
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	175,578		175,578		177,071
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	165,796		165,796		225,398
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	210,304		210,304		181,934
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	173,254		173,254		106,695
Prior	407,817		407,817		334,576
Revolving Loans Amortized Cost Basis	130,934		130,934		128,687
Revolving Loan Converted to Term	0		0		0
Total	1,368,375		1,368,375		1,316,448
Nonperforming | Consumer
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	106		106		345
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	461		461		424
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	482		482		602
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	254		254		593
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	291		291		178
Prior	86		86		115
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total	1,680		1,680		2,257
Nonperforming | Residential
Total Loans
Financing receivable, excluding accrued interest, year one, originated, current fiscal year	0		0		0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year	258		258		201
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year	0		0		254
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year	1,994		1,994		201
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year	343		343		464
Prior	1,605		1,605		2,386
Revolving Loans Amortized Cost Basis	175		175		250
Revolving Loan Converted to Term	0		0		0
Total	$ 4,375		$ 4,375		$ 3,756