Loans - Loan Ratings by Loan Class, Commercial (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 3,741,486		$ 3,741,486		$ 3,465,352
Accrued interest excluded from total	11,962		11,962		10,009
Current period gross charge-offs	581	$ 606	2,862	$ 1,897
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	245,001		245,001		328,479
Financing receivable, year two, originated, fiscal year before current fiscal year	348,302		348,302		249,861
Financing receivable, year three, originated, two years before current fiscal year	243,281		243,281		97,516
Financing receivable, year four, originated, three years before current fiscal year	84,370		84,370		150,582
Financing receivable, year five, originated, four years before current fiscal year	146,638		146,638		90,533
Financing receivable, originated, more than five years before current fiscal year	315,486		315,486		267,041
Revolving Loans Amortized Cost Basis	243,044		243,044		282,841
Total loans	1,626,122		1,626,122		1,466,853
Accrued interest, current fiscal year	462		462		847
Accrued interest, fiscal year before current	1,137		1,137		646
Accrued interest, two years before current	807		807		234
Accrued interest, three years before current	199		199		473
Accrued interest, four years before current	490		490		387
Accrued interest, more than five years before current fiscal year	1,219		1,219		823
Accrued interest, revolving	1,147		1,147		999
Accrued interest excluded from total	5,461		5,461		4,409
Gross charge-offs, current fiscal year			0
Gross charge-offs, fiscal year before current			0
Gross charge-offs, two years before current			0
Gross charge-offs, three years before current			0
Gross charge-offs, four years before current			960
Gross charge-offs, more than five years before current			69
Gross charge-offs, revolving			24
Current period gross charge-offs	24	$ 0	1,053	$ 0
Commercial | Non-watch (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	244,403		244,403		327,799
Financing receivable, year two, originated, fiscal year before current fiscal year	342,750		342,750		244,169
Financing receivable, year three, originated, two years before current fiscal year	223,603		223,603		96,354
Financing receivable, year four, originated, three years before current fiscal year	79,048		79,048		143,554
Financing receivable, year five, originated, four years before current fiscal year	136,560		136,560		87,295
Financing receivable, originated, more than five years before current fiscal year	305,806		305,806		255,422
Revolving Loans Amortized Cost Basis	232,577		232,577		279,936
Total loans	1,564,747		1,564,747		1,434,529
Commercial | Watch (7-8)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	598		598		680
Financing receivable, year two, originated, fiscal year before current fiscal year	4,622		4,622		4,721
Financing receivable, year three, originated, two years before current fiscal year	18,231		18,231		1,094
Financing receivable, year four, originated, three years before current fiscal year	5,274		5,274		6,459
Financing receivable, year five, originated, four years before current fiscal year	6,568		6,568		1,115
Financing receivable, originated, more than five years before current fiscal year	9,596		9,596		6,115
Revolving Loans Amortized Cost Basis	9,695		9,695		2,905
Total loans	54,584		54,584		23,089
Commercial | 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	930		930		971
Financing receivable, year three, originated, two years before current fiscal year	1,447		1,447		68
Financing receivable, year four, originated, three years before current fiscal year	48		48		569
Financing receivable, year five, originated, four years before current fiscal year	3,510		3,510		2,123
Financing receivable, originated, more than five years before current fiscal year	53		53		5,466
Revolving Loans Amortized Cost Basis	772		772		0
Total loans	6,760		6,760		9,197
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	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	31		31		38
Revolving Loans Amortized Cost Basis	0		0		0
Total loans	31		31		38
Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	90,212		90,212		158,241
Financing receivable, year two, originated, fiscal year before current fiscal year	166,783		166,783		94,761
Financing receivable, year three, originated, two years before current fiscal year	85,588		85,588		59,141
Financing receivable, year four, originated, three years before current fiscal year	54,037		54,037		47,870
Financing receivable, year five, originated, four years before current fiscal year	58,543		58,543		30,929
Financing receivable, originated, more than five years before current fiscal year	120,946		120,946		100,822
Revolving Loans Amortized Cost Basis	197,305		197,305		240,699
Total loans	773,414		773,414		732,463
Accrued interest, current fiscal year	150		150		238
Accrued interest, fiscal year before current	448		448		178
Accrued interest, two years before current	163		163		146
Accrued interest, three years before current	131		131		105
Accrued interest, four years before current	136		136		181
Accrued interest, more than five years before current fiscal year	533		533		308
Accrued interest, revolving	970		970		890
Accrued interest excluded from total	2,531		2,531		2,046
Gross charge-offs, current fiscal year			0
Gross charge-offs, fiscal year before current			0
Gross charge-offs, two years before current			0
Gross charge-offs, three years before current			0
Gross charge-offs, four years before current			0
Gross charge-offs, more than five years before current			69
Gross charge-offs, revolving			24
Current period gross charge-offs			93
Commercial | Commercial and industrial | Non-watch (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	89,614		89,614		157,561
Financing receivable, year two, originated, fiscal year before current fiscal year	161,231		161,231		89,251
Financing receivable, year three, originated, two years before current fiscal year	81,054		81,054		58,292
Financing receivable, year four, originated, three years before current fiscal year	48,715		48,715		45,792
Financing receivable, year five, originated, four years before current fiscal year	52,897		52,897		30,715
Financing receivable, originated, more than five years before current fiscal year	116,890		116,890		95,908
Revolving Loans Amortized Cost Basis	186,838		186,838		237,906
Total loans	737,239		737,239		715,425
Commercial | Commercial and industrial | Watch (7-8)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	598		598		680
Financing receivable, year two, originated, fiscal year before current fiscal year	4,622		4,622		4,539
Financing receivable, year three, originated, two years before current fiscal year	3,087		3,087		781
Financing receivable, year four, originated, three years before current fiscal year	5,274		5,274		1,690
Financing receivable, year five, originated, four years before current fiscal year	4,204		4,204		105
Financing receivable, originated, more than five years before current fiscal year	3,972		3,972		4,474
Revolving Loans Amortized Cost Basis	9,695		9,695		2,793
Total loans	31,452		31,452		15,062
Commercial | Commercial and industrial | 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	930		930		971
Financing receivable, year three, originated, two years before current fiscal year	1,447		1,447		68
Financing receivable, year four, originated, three years before current fiscal year	48		48		388
Financing receivable, year five, originated, four years before current fiscal year	1,442		1,442		109
Financing receivable, originated, more than five years before current fiscal year	53		53		402
Revolving Loans Amortized Cost Basis	772		772		0
Total loans	4,692		4,692		1,938
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	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	31		31		38
Revolving Loans Amortized Cost Basis	0		0		0
Total loans	31		31		38
Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	154,789		154,789		170,238
Financing receivable, year two, originated, fiscal year before current fiscal year	181,519		181,519		155,100
Financing receivable, year three, originated, two years before current fiscal year	157,693		157,693		38,375
Financing receivable, year four, originated, three years before current fiscal year	30,333		30,333		102,712
Financing receivable, year five, originated, four years before current fiscal year	88,095		88,095		59,604
Financing receivable, originated, more than five years before current fiscal year	194,540		194,540		166,219
Revolving Loans Amortized Cost Basis	45,739		45,739		42,142
Total loans	852,708		852,708		734,390
Accrued interest, current fiscal year	312		312		609
Accrued interest, fiscal year before current	689		689		468
Accrued interest, two years before current	644		644		88
Accrued interest, three years before current	68		68		368
Accrued interest, four years before current	354		354		206
Accrued interest, more than five years before current fiscal year	686		686		515
Accrued interest, revolving	177		177		109
Accrued interest excluded from total	2,930		2,930		2,363
Gross charge-offs, current fiscal year			0
Gross charge-offs, fiscal year before current			0
Gross charge-offs, two years before current			0
Gross charge-offs, three years before current			0
Gross charge-offs, four years before current			960
Gross charge-offs, more than five years before current			0
Gross charge-offs, revolving			0
Current period gross charge-offs			960
Commercial | Commercial real estate | Non-watch (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one, originated, current fiscal year	154,789		154,789		170,238
Financing receivable, year two, originated, fiscal year before current fiscal year	181,519		181,519		154,918
Financing receivable, year three, originated, two years before current fiscal year	142,549		142,549		38,062
Financing receivable, year four, originated, three years before current fiscal year	30,333		30,333		97,762
Financing receivable, year five, originated, four years before current fiscal year	83,663		83,663		56,580
Financing receivable, originated, more than five years before current fiscal year	188,916		188,916		159,514
Revolving Loans Amortized Cost Basis	45,739		45,739		42,030
Total loans	827,508		827,508		719,104
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		182
Financing receivable, year three, originated, two years before current fiscal year	15,144		15,144		313
Financing receivable, year four, originated, three years before current fiscal year	0		0		4,769
Financing receivable, year five, originated, four years before current fiscal year	2,364		2,364		1,010
Financing receivable, originated, more than five years before current fiscal year	5,624		5,624		1,641
Revolving Loans Amortized Cost Basis	0		0		112
Total loans	23,132		23,132		8,027
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	0		0		181
Financing receivable, year five, originated, four years before current fiscal year	2,068		2,068		2,014
Financing receivable, originated, more than five years before current fiscal year	0		0		5,064
Revolving Loans Amortized Cost Basis	0		0		0
Total loans	2,068		2,068		7,259
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