Loans - Loan Ratings by Loan Class, Commercial (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
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 3,942,287		$ 3,942,287		$ 3,790,901
Accrued interest excluded from total	13,336		13,336		12,500
Current period gross charge-offs	1,018	$ 581	2,720	$ 2,862
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	200,559		200,559		313,144
Financing receivable, year two, originated, fiscal year before current fiscal year	377,499		377,499		327,184
Financing receivable, year three, originated, two years before current fiscal year	314,815		314,815		203,020
Financing receivable, year four, originated, three years before current fiscal year	164,029		164,029		79,908
Financing receivable, year five, originated, four years before current fiscal year	135,993		135,993		127,798
Financing receivable, originated, more than five years before current fiscal year	295,221		295,221		282,057
Revolving Loans Amortized Cost Basis	337,131		337,131		346,620
Total loans	1,825,247		1,825,247		1,679,731
Accrued interest, current fiscal year	689		689		787
Accrued interest, fiscal year before current	1,192		1,192		1,123
Accrued interest, two years before current	1,019		1,019		563
Accrued interest, three years before current	403		403		201
Accrued interest, four years before current	498		498		467
Accrued interest, more than five years before current fiscal year	990		990		987
Accrued interest, revolving	1,507		1,507		1,615
Accrued interest excluded from total	6,298		6,298		5,743
Gross charge-offs, current fiscal year			0		0
Gross charge-offs, fiscal year before current			0		0
Gross charge-offs, two years before current			0		0
Gross charge-offs, three years before current			0		0
Gross charge-offs, four years before current			0		960
Gross charge-offs, more than five years before current			0		69
Gross charge-offs, revolving			0		25
Current period gross charge-offs	0	$ 24	0	$ 1,053	1,054
Commercial | Non-watch (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	187,940		187,940		313,048
Financing receivable, year two, originated, fiscal year before current fiscal year	375,304		375,304		321,945
Financing receivable, year three, originated, two years before current fiscal year	311,192		311,192		201,509
Financing receivable, year four, originated, three years before current fiscal year	160,469		160,469		77,328
Financing receivable, year five, originated, four years before current fiscal year	132,600		132,600		121,282
Financing receivable, originated, more than five years before current fiscal year	288,796		288,796		274,225
Revolving Loans Amortized Cost Basis	308,731		308,731		334,486
Total loans	1,765,032		1,765,032		1,643,823
Commercial | Watch (7-8)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	10,234		10,234		96
Financing receivable, year two, originated, fiscal year before current fiscal year	2,195		2,195		5,239
Financing receivable, year three, originated, two years before current fiscal year	3,623		3,623		964
Financing receivable, year four, originated, three years before current fiscal year	2,846		2,846		2,580
Financing receivable, year five, originated, four years before current fiscal year	3,112		3,112		6,495
Financing receivable, originated, more than five years before current fiscal year	5,723		5,723		7,800
Revolving Loans Amortized Cost Basis	25,642		25,642		11,938
Total loans	53,375		53,375		35,112
Commercial | Substandard Accrual (9)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	2,385		2,385		0
Financing receivable, year two, originated, fiscal year before current fiscal year	0		0		0
Financing receivable, year three, originated, two years before current fiscal year	0		0		547
Financing receivable, year four, originated, three years before current fiscal year	667		667		0
Financing receivable, year five, originated, four years before current fiscal year	281		281		21
Financing receivable, originated, more than five years before current fiscal year	690		690		4
Revolving Loans Amortized Cost Basis	2,758		2,758		196
Total loans	6,781		6,781		768
Commercial | Non-Accrual (10-11)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0		0		0
Financing receivable, year two, originated, fiscal year before current fiscal year	0		0		0
Financing receivable, year three, originated, two years before current fiscal year	0		0		0
Financing receivable, year four, originated, three years before current fiscal year	47		47		0
Financing receivable, year five, originated, four years before current fiscal year	0		0		0
Financing receivable, originated, more than five years before current fiscal year	12		12		28
Revolving Loans Amortized Cost Basis	0		0		0
Total loans	59		59		28
Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	124,686		124,686		110,568
Financing receivable, year two, originated, fiscal year before current fiscal year	143,856		143,856		157,954
Financing receivable, year three, originated, two years before current fiscal year	146,720		146,720		71,592
Financing receivable, year four, originated, three years before current fiscal year	84,181		84,181		50,224
Financing receivable, year five, originated, four years before current fiscal year	84,217		84,217		46,770
Financing receivable, originated, more than five years before current fiscal year	113,665		113,665		100,269
Revolving Loans Amortized Cost Basis	257,427		257,427		272,768
Total loans	954,752		954,752		810,145
Accrued interest, current fiscal year	441		441		239
Accrued interest, fiscal year before current	500		500		438
Accrued interest, two years before current	394		394		132
Accrued interest, three years before current	206		206		128
Accrued interest, four years before current	367		367		120
Accrued interest, more than five years before current fiscal year	352		352		326
Accrued interest, revolving	1,181		1,181		1,327
Accrued interest excluded from total	3,441		3,441		2,710
Gross charge-offs, current fiscal year			0		0
Gross charge-offs, fiscal year before current			0		0
Gross charge-offs, two years before current			0		0
Gross charge-offs, three years before current			0		0
Gross charge-offs, four years before current			0		0
Gross charge-offs, more than five years before current			0		69
Gross charge-offs, revolving			0		25
Current period gross charge-offs			0		94
Commercial | Commercial and industrial | Non-watch (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	112,067		112,067		110,472
Financing receivable, year two, originated, fiscal year before current fiscal year	141,661		141,661		152,715
Financing receivable, year three, originated, two years before current fiscal year	143,097		143,097		70,081
Financing receivable, year four, originated, three years before current fiscal year	80,758		80,758		47,644
Financing receivable, year five, originated, four years before current fiscal year	80,824		80,824		42,576
Financing receivable, originated, more than five years before current fiscal year	112,391		112,391		97,960
Revolving Loans Amortized Cost Basis	245,614		245,614		260,634
Total loans	916,412		916,412		782,082
Commercial | Commercial and industrial | Watch (7-8)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	10,234		10,234		96
Financing receivable, year two, originated, fiscal year before current fiscal year	2,195		2,195		5,239
Financing receivable, year three, originated, two years before current fiscal year	3,623		3,623		964
Financing receivable, year four, originated, three years before current fiscal year	2,846		2,846		2,580
Financing receivable, year five, originated, four years before current fiscal year	3,112		3,112		4,173
Financing receivable, originated, more than five years before current fiscal year	1,262		1,262		2,277
Revolving Loans Amortized Cost Basis	9,055		9,055		11,938
Total loans	32,327		32,327		27,267
Commercial | Commercial and industrial | Substandard Accrual (9)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	2,385		2,385		0
Financing receivable, year two, originated, fiscal year before current fiscal year	0		0		0
Financing receivable, year three, originated, two years before current fiscal year	0		0		547
Financing receivable, year four, originated, three years before current fiscal year	530		530		0
Financing receivable, year five, originated, four years before current fiscal year	281		281		21
Financing receivable, originated, more than five years before current fiscal year	0		0		4
Revolving Loans Amortized Cost Basis	2,758		2,758		196
Total loans	5,954		5,954		768
Commercial | Commercial and industrial | Non-Accrual (10-11)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0		0		0
Financing receivable, year two, originated, fiscal year before current fiscal year	0		0		0
Financing receivable, year three, originated, two years before current fiscal year	0		0		0
Financing receivable, year four, originated, three years before current fiscal year	47		47		0
Financing receivable, year five, originated, four years before current fiscal year	0		0		0
Financing receivable, originated, more than five years before current fiscal year	12		12		28
Revolving Loans Amortized Cost Basis	0		0		0
Total loans	59		59		28
Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	75,873		75,873		202,576
Financing receivable, year two, originated, fiscal year before current fiscal year	233,643		233,643		169,230
Financing receivable, year three, originated, two years before current fiscal year	168,095		168,095		131,428
Financing receivable, year four, originated, three years before current fiscal year	79,848		79,848		29,684
Financing receivable, year five, originated, four years before current fiscal year	51,776		51,776		81,028
Financing receivable, originated, more than five years before current fiscal year	181,556		181,556		181,788
Revolving Loans Amortized Cost Basis	79,704		79,704		73,852
Total loans	870,495		870,495		869,586
Accrued interest, current fiscal year	248		248		548
Accrued interest, fiscal year before current	692		692		685
Accrued interest, two years before current	625		625		431
Accrued interest, three years before current	197		197		73
Accrued interest, four years before current	131		131		347
Accrued interest, more than five years before current fiscal year	638		638		661
Accrued interest, revolving	326		326		288
Accrued interest excluded from total	2,857		2,857		3,033
Gross charge-offs, current fiscal year			0		0
Gross charge-offs, fiscal year before current			0		0
Gross charge-offs, two years before current			0		0
Gross charge-offs, three years before current			0		0
Gross charge-offs, four years before current			0		960
Gross charge-offs, more than five years before current			0		0
Gross charge-offs, revolving			0		0
Current period gross charge-offs			0		960
Commercial | Commercial real estate | Non-watch (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	75,873		75,873		202,576
Financing receivable, year two, originated, fiscal year before current fiscal year	233,643		233,643		169,230
Financing receivable, year three, originated, two years before current fiscal year	168,095		168,095		131,428
Financing receivable, year four, originated, three years before current fiscal year	79,711		79,711		29,684
Financing receivable, year five, originated, four years before current fiscal year	51,776		51,776		78,706
Financing receivable, originated, more than five years before current fiscal year	176,405		176,405		176,265
Revolving Loans Amortized Cost Basis	63,117		63,117		73,852
Total loans	848,620		848,620		861,741
Commercial | Commercial real estate | Watch (7-8)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0		0		0
Financing receivable, year two, originated, fiscal year before current fiscal year	0		0		0
Financing receivable, year three, originated, two years before current fiscal year	0		0		0
Financing receivable, year four, originated, three years before current fiscal year	0		0		0
Financing receivable, year five, originated, four years before current fiscal year	0		0		2,322
Financing receivable, originated, more than five years before current fiscal year	4,461		4,461		5,523
Revolving Loans Amortized Cost Basis	16,587		16,587		0
Total loans	21,048		21,048		7,845
Commercial | Commercial real estate | Substandard Accrual (9)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0		0		0
Financing receivable, year two, originated, fiscal year before current fiscal year	0		0		0
Financing receivable, year three, originated, two years before current fiscal year	0		0		0
Financing receivable, year four, originated, three years before current fiscal year	137		137		0
Financing receivable, year five, originated, four years before current fiscal year	0		0		0
Financing receivable, originated, more than five years before current fiscal year	690		690		0
Revolving Loans Amortized Cost Basis	0		0		0
Total loans	827		827		0
Commercial | Commercial real estate | Non-Accrual (10-11)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	0		0		0
Financing receivable, year two, originated, fiscal year before current fiscal year	0		0		0
Financing receivable, year three, originated, two years before current fiscal year	0		0		0
Financing receivable, year four, originated, three years before current fiscal year	0		0		0
Financing receivable, year five, originated, four years before current fiscal year	0		0		0
Financing receivable, originated, more than five years before current fiscal year	0		0		0
Revolving Loans Amortized Cost Basis	0		0		0
Total loans	$ 0		$ 0		$ 0