Loans (Past Due Loans) (Details) - USD ($) $ in Thousands		Dec. 31, 2025	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Total loans	[1]	$ 5,134,388	$ 5,137,838
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans	[2]	2,183,985	2,154,504
Commercial & industrial
Financing Receivable, Past Due [Line Items]
Total loans	[3]	564,082	542,474
Total commercial
Financing Receivable, Past Due [Line Items]
Total loans		2,748,067	2,696,978
Residential real estate
Financing Receivable, Past Due [Line Items]
Total loans	[4]	2,050,399	2,126,171
Home Equity
Financing Receivable, Past Due [Line Items]
Total loans		318,862	297,119
Other
Financing Receivable, Past Due [Line Items]
Total loans	[5]	17,060	17,570
Total Consumer
Financing Receivable, Past Due [Line Items]
Total loans		335,922	314,689
Current
Financing Receivable, Past Due [Line Items]
Total loans		5,123,005	5,125,856
Current | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans		2,183,337	2,154,504
Current | Commercial & industrial
Financing Receivable, Past Due [Line Items]
Total loans		564,075	541,574
Current | Total commercial
Financing Receivable, Past Due [Line Items]
Total loans		2,747,412	2,696,078
Current | Residential real estate
Financing Receivable, Past Due [Line Items]
Total loans		2,041,304	2,118,430
Current | Home Equity
Financing Receivable, Past Due [Line Items]
Total loans		317,255	294,172
Current | Other
Financing Receivable, Past Due [Line Items]
Total loans		17,034	17,176
Current | Total Consumer
Financing Receivable, Past Due [Line Items]
Total loans		334,289	311,348
30-59
Financing Receivable, Past Due [Line Items]
Total loans		5,309	5,668
30-59 | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans		648	0
30-59 | Commercial & industrial
Financing Receivable, Past Due [Line Items]
Total loans		7	518
30-59 | Total commercial
Financing Receivable, Past Due [Line Items]
Total loans		655	518
30-59 | Residential real estate
Financing Receivable, Past Due [Line Items]
Total loans		3,533	3,476
30-59 | Home Equity
Financing Receivable, Past Due [Line Items]
Total loans		1,095	1,630
30-59 | Other
Financing Receivable, Past Due [Line Items]
Total loans		26	44
30-59 | Total Consumer
Financing Receivable, Past Due [Line Items]
Total loans		1,121	1,674
60-89
Financing Receivable, Past Due [Line Items]
Total loans		2,726	3,034
60-89 | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans		0	0
60-89 | Commercial & industrial
Financing Receivable, Past Due [Line Items]
Total loans		0	382
60-89 | Total commercial
Financing Receivable, Past Due [Line Items]
Total loans		0	382
60-89 | Residential real estate
Financing Receivable, Past Due [Line Items]
Total loans		2,560	1,892
60-89 | Home Equity
Financing Receivable, Past Due [Line Items]
Total loans		166	410
60-89 | Other
Financing Receivable, Past Due [Line Items]
Total loans		0	350
60-89 | Total Consumer
Financing Receivable, Past Due [Line Items]
Total loans		166	760
Over 90
Financing Receivable, Past Due [Line Items]
Total loans		3,348	3,280
Over 90 | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans		0	0
Over 90 | Commercial & industrial
Financing Receivable, Past Due [Line Items]
Total loans		0	0
Over 90 | Total commercial
Financing Receivable, Past Due [Line Items]
Total loans		0	0
Over 90 | Residential real estate
Financing Receivable, Past Due [Line Items]
Total loans		3,002	2,373
Over 90 | Home Equity
Financing Receivable, Past Due [Line Items]
Total loans		346	907
Over 90 | Other
Financing Receivable, Past Due [Line Items]
Total loans		0	0
Over 90 | Total Consumer
Financing Receivable, Past Due [Line Items]
Total loans		346	907
Total Past Due
Financing Receivable, Past Due [Line Items]
Total loans		11,383	11,982
Total Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans		648	0
Total Past Due | Commercial & industrial
Financing Receivable, Past Due [Line Items]
Total loans		7	900
Total Past Due | Total commercial
Financing Receivable, Past Due [Line Items]
Total loans		655	900
Total Past Due | Residential real estate
Financing Receivable, Past Due [Line Items]
Total loans		9,095	7,741
Total Past Due | Home Equity
Financing Receivable, Past Due [Line Items]
Total loans		1,607	2,947
Total Past Due | Other
Financing Receivable, Past Due [Line Items]
Total loans		26	394
Total Past Due | Total Consumer
Financing Receivable, Past Due [Line Items]
Total loans		$ 1,633	$ 3,341

[1] Includes net unamortized loan origination costs of $11.0 million and $10.9 million, respectively, at December 31, 2025 and 2024 and net unamortized premiums on loans purchased from and serviced by other financial institutions of $198 thousand and $242 thousand, respectively, at December 31, 2025 and 2024.

[2] CRE consists of commercial mortgages primarily secured by non-owner occupied income-producing property, as well as construction and development loans. Construction and development loans are made to businesses for land development or the on-site construction of industrial, commercial, or residential buildings.

[3] C&I consists of loans to businesses and individuals, a portion of which are fully or partially collateralized by real estate.

[4] Residential real estate consists of mortgage and homeowner construction loans secured by one- to four-family residential properties. Also, includes a negative basis adjustment associated with fair value hedges of $335 thousand and $1.5 million, respectively, at December 31, 2025 and 2024. See Note 9 for additional disclosure.

[5] Other consists of loans to individuals secured by general aviation aircraft and other personal installment loans.