Loans and Allowance for Credit Losses on Loans - Schedule of Credit Risk Ratings by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Financing Receivable Recorded Investment [Line Items]
Current Year		$ 273,748		$ 221,745
Year One		217,330		582,171
Year Two		608,562		284,271
Year Three		305,465		145,890
Year Four		134,177		178,838
Prior		222,060		272,711
Revolving Loans		167,343		77,658
Revolving Loans Converted to Term Loans		2,322		2,561
Total		1,931,007		1,765,845
Current period charge-offs
Current Year		0		17
Year One		32		457
Year Two		0		247
Year Three		66		0
Year Four		0		91
Prior		10		52
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total	$ 492	$ 108	$ 628	$ 864
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]		Accrued interest receivable		Accrued interest receivable
Accrued interest receivable		$ 8,400		$ 7,300
Pass
Financing Receivable Recorded Investment [Line Items]
Current Year		273,748		221,745
Year One		217,275		577,233
Year Two		588,972		282,943
Year Three		302,477		144,754
Year Four		134,001		178,838
Prior		217,987		264,767
Revolving Loans		166,643		77,658
Revolving Loans Converted to Term Loans		2,322		2,561
Total		1,903,425		1,750,499
Special mention
Financing Receivable Recorded Investment [Line Items]
Current Year		0		0
Year One		55		0
Year Two		3,318		0
Year Three		0		0
Year Four		0		0
Prior		467		1,428
Revolving Loans		700		0
Revolving Loans Converted to Term Loans		0		0
Total		4,540		1,428
Substandard
Financing Receivable Recorded Investment [Line Items]
Current Year		0		0
Year One		0		4,938
Year Two		16,272		1,328
Year Three		2,988		1,136
Year Four		176		0
Prior		3,508		6,418
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		22,944		13,820
Doubtful
Financing Receivable Recorded Investment [Line Items]
Current Year		0		0
Year One		0		0
Year Two		0		0
Year Three		0		0
Year Four		0		0
Prior		98		98
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		98		98
Commercial real estate
Financing Receivable Recorded Investment [Line Items]
Current Year		199,186		97,114
Year One		105,858		208,179
Year Two		246,638		154,872
Year Three		188,208		97,137
Year Four		95,033		138,908
Prior		105,307		168,316
Revolving Loans		26,242		21,059
Revolving Loans Converted to Term Loans		0		0
Total		966,472		885,585
Current period charge-offs
Current Year		0		0
Year One		0		457
Year Two		0		121
Year Three		0		0
Year Four		0		91
Prior		0		17
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total	457	0	548	686
Commercial real estate | Pass
Financing Receivable Recorded Investment [Line Items]
Current Year		199,186		97,114
Year One		105,858		207,860
Year Two		241,434		154,872
Year Three		188,208		97,137
Year Four		95,033		138,908
Prior		104,943		163,320
Revolving Loans		26,242		21,059
Revolving Loans Converted to Term Loans		0		0
Total		960,904		880,270
Commercial real estate | Special mention
Financing Receivable Recorded Investment [Line Items]
Current Year		0		0
Year One		0		0
Year Two		581		0
Year Three		0		0
Year Four		0		0
Prior		0		0
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		581		0
Commercial real estate | Substandard
Financing Receivable Recorded Investment [Line Items]
Current Year		0		0
Year One		0		319
Year Two		4,623		0
Year Three		0		0
Year Four		0		0
Prior		364		4,996
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		4,987		5,315
Commercial real estate | Doubtful
Financing Receivable Recorded Investment [Line Items]
Current Year		0		0
Year One		0		0
Year Two		0		0
Year Three		0		0
Year Four		0		0
Prior		0		0
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		0		0
SBA—real estate
Financing Receivable Recorded Investment [Line Items]
Current Year		25,075		31,920
Year One		27,853		46,291
Year Two		55,363		27,267
Year Three		27,621		23,868
Year Four		16,212		28,244
Prior		80,085		67,105
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		232,209		224,695
Current period charge-offs
Current Year		0		0
Year One		0		0
Year Two		0		46
Year Three		66		0
Year Four		0		0
Prior		0		0
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total	35	66	46	46
SBA—real estate | Pass
Financing Receivable Recorded Investment [Line Items]
Current Year		25,075		31,920
Year One		27,853		44,504
Year Two		41,894		26,188
Year Three		24,633		22,732
Year Four		16,212		28,244
Prior		76,595		64,442
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		212,262		218,030
SBA—real estate | Special mention
Financing Receivable Recorded Investment [Line Items]
Current Year		0		0
Year One		0		0
Year Two		2,737		0
Year Three		0		0
Year Four		0		0
Prior		467		1,428
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		3,204		1,428
SBA—real estate | Substandard
Financing Receivable Recorded Investment [Line Items]
Current Year		0		0
Year One		0		1,787
Year Two		10,732		1,079
Year Three		2,988		1,136
Year Four		0		0
Prior		3,023		1,235
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		16,743		5,237
SBA—real estate | Doubtful
Financing Receivable Recorded Investment [Line Items]
Current Year		0		0
Year One		0		0
Year Two		0		0
Year Three		0		0
Year Four		0		0
Prior		0		0
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		0		0
SBA—non-real estate
Financing Receivable Recorded Investment [Line Items]
Current Year		7,967		5,408
Year One		4,748		3,175
Year Two		2,604		200
Year Three		173		1,556
Year Four		1,523		950
Prior		3,155		3,708
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		20,170		14,997
Current period charge-offs
Current Year		0		0
Year One		32		0
Year Two		0		0
Year Three		0		0
Year Four		0		0
Prior		10		35
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total	0	42	34	35
SBA—non-real estate | Pass
Financing Receivable Recorded Investment [Line Items]
Current Year		7,967		5,408
Year One		4,693		2,584
Year Two		2,094		200
Year Three		173		1,556
Year Four		1,347		950
Prior		2,936		3,423
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		19,210		14,121
SBA—non-real estate | Special mention
Financing Receivable Recorded Investment [Line Items]
Current Year		0		0
Year One		55		0
Year Two		0		0
Year Three		0		0
Year Four		0		0
Prior		0		0
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		55		0
SBA—non-real estate | Substandard
Financing Receivable Recorded Investment [Line Items]
Current Year		0		0
Year One		0		591
Year Two		510		0
Year Three		0		0
Year Four		176		0
Prior		121		187
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		807		778
SBA—non-real estate | Doubtful
Financing Receivable Recorded Investment [Line Items]
Current Year		0		0
Year One		0		0
Year Two		0		0
Year Three		0		0
Year Four		0		0
Prior		98		98
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		98		98
C&I
Financing Receivable Recorded Investment [Line Items]
Current Year		17,191		15,117
Year One		13,848		17,939
Year Two		16,000		22,098
Year Three		18,438		4,695
Year Four		3,561		1,720
Prior		11		1,734
Revolving Loans		141,105		55,106
Revolving Loans Converted to Term Loans		2,322		2,561
Total		212,476		120,970
Current period charge-offs
Current Year		0		17
Year One		0		0
Year Two		0		80
Year Three		0		0
Year Four		0		0
Prior		0		0
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total	0	0	0	97
C&I | Pass
Financing Receivable Recorded Investment [Line Items]
Current Year		17,191		15,117
Year One		13,848		17,939
Year Two		15,593		22,098
Year Three		18,438		4,695
Year Four		3,561		1,720
Prior		11		1,734
Revolving Loans		140,405		55,106
Revolving Loans Converted to Term Loans		2,322		2,561
Total		211,369		120,970
C&I | Special mention
Financing Receivable Recorded Investment [Line Items]
Current Year		0		0
Year One		0		0
Year Two		0		0
Year Three		0		0
Year Four		0		0
Prior		0		0
Revolving Loans		700		0
Revolving Loans Converted to Term Loans		0		0
Total		700		0
C&I | Substandard
Financing Receivable Recorded Investment [Line Items]
Current Year		0		0
Year One		0		0
Year Two		407		0
Year Three		0		0
Year Four		0		0
Prior		0		0
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		407		0
C&I | Doubtful
Financing Receivable Recorded Investment [Line Items]
Current Year		0		0
Year One		0		0
Year Two		0		0
Year Three		0		0
Year Four		0		0
Prior		0		0
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		0		0
Home mortgage
Financing Receivable Recorded Investment [Line Items]
Current Year		24,311		72,182
Year One		65,023		306,587
Year Two		287,957		79,834
Year Three		71,025		18,634
Year Four		17,848		8,939
Prior		33,502		31,848
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		499,666		518,024
Current period charge-offs
Current Year		0		0
Year One		0		0
Year Two		0		0
Year Three		0		0
Year Four		0		0
Prior		0		0
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total	0	0	0	0
Home mortgage | Pass
Financing Receivable Recorded Investment [Line Items]
Current Year		24,311		72,182
Year One		65,023		304,346
Year Two		287,957		79,585
Year Three		71,025		18,634
Year Four		17,848		8,939
Prior		33,502		31,848
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		499,666		515,534
Home mortgage | Special mention
Financing Receivable Recorded Investment [Line Items]
Current Year		0		0
Year One		0		0
Year Two		0		0
Year Three		0		0
Year Four		0		0
Prior		0		0
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		0		0
Home mortgage | Substandard
Financing Receivable Recorded Investment [Line Items]
Current Year		0		0
Year One		0		2,241
Year Two		0		249
Year Three		0		0
Year Four		0		0
Prior		0		0
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		0		2,490
Home mortgage | Doubtful
Financing Receivable Recorded Investment [Line Items]
Current Year		0		0
Year One		0		0
Year Two		0		0
Year Three		0		0
Year Four		0		0
Prior		0		0
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		0		0
Consumer
Financing Receivable Recorded Investment [Line Items]
Current Year		18		4
Year One		0		0
Year Two		0		0
Year Three		0		0
Year Four		0		77
Prior		0		0
Revolving Loans		(4)		1,493
Revolving Loans Converted to Term Loans		0		0
Total		14		1,574
Current period charge-offs
Current Year		0		0
Year One		0		0
Year Two		0		0
Year Three		0		0
Year Four		0		0
Prior		0		0
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total	$ 0	0	$ 0	0
Consumer | Pass
Financing Receivable Recorded Investment [Line Items]
Current Year		18		4
Year One		0		0
Year Two		0		0
Year Three		0		0
Year Four		0		77
Prior		0		0
Revolving Loans		(4)		1,493
Revolving Loans Converted to Term Loans		0		0
Total		14		1,574
Consumer | Special mention
Financing Receivable Recorded Investment [Line Items]
Current Year		0		0
Year One		0		0
Year Two		0		0
Year Three		0		0
Year Four		0		0
Prior		0		0
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		0		0
Consumer | Substandard
Financing Receivable Recorded Investment [Line Items]
Current Year		0		0
Year One		0		0
Year Two		0		0
Year Three		0		0
Year Four		0		0
Prior		0		0
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		0		0
Consumer | Doubtful
Financing Receivable Recorded Investment [Line Items]
Current Year		0		0
Year One		0		0
Year Two		0		0
Year Three		0		0
Year Four		0		0
Prior		0		0
Revolving Loans		0		0
Revolving Loans Converted to Term Loans		0		0
Total		$ 0		$ 0