Loans (Past Due Loans) (Details) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Current		$ 5,636,361	$ 5,098,561
Total loans	[1]	5,647,706	5,110,139
Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Current		2,106,359	1,828,117
Total loans	[2]	2,106,359	1,829,304
Commercial & Industrial
Financing Receivable, Past Due [Line Items]
Current		605,062	656,132
Total loans	[3]	605,072	656,397
Total Commercial
Financing Receivable, Past Due [Line Items]
Current		2,711,421	2,484,249
Total loans		2,711,431	2,485,701
Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Current		2,596,362	2,314,127
Total loans	[4]	2,604,478	2,323,002
Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Current		309,398	284,480
Total loans		312,594	285,715
Other Consumer [Member]
Financing Receivable, Past Due [Line Items]
Current		19,180	15,705
Total loans	[5]	19,203	15,721
Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Current		328,578	300,185
Total loans		331,797	301,436
30-59
Financing Receivable, Past Due [Line Items]
Past due		6,748	7,364
30-59 | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Past due		0	1,187
30-59 | Commercial & Industrial
Financing Receivable, Past Due [Line Items]
Past due		10	265
30-59 | Total Commercial
Financing Receivable, Past Due [Line Items]
Past due		10	1,452
30-59 | Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due		4,369	4,793
30-59 | Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Past due		2,349	1,103
30-59 | Other Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		20	16
30-59 | Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		2,369	1,119
60-89
Financing Receivable, Past Due [Line Items]
Past due		1,853	435
60-89 | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Past due		0	0
60-89 | Commercial & Industrial
Financing Receivable, Past Due [Line Items]
Past due		0	0
60-89 | Total Commercial
Financing Receivable, Past Due [Line Items]
Past due		0	0
60-89 | Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due		1,738	303
60-89 | Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Past due		112	132
60-89 | Other Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		3	0
60-89 | Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		115	132
Over 90
Financing Receivable, Past Due [Line Items]
Past due		2,744	3,779
Over 90 | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Past due		0	0
Over 90 | Commercial & Industrial
Financing Receivable, Past Due [Line Items]
Past due		0	0
Over 90 | Total Commercial
Financing Receivable, Past Due [Line Items]
Past due		0	0
Over 90 | Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due		2,009	3,779
Over 90 | Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Past due		735	0
Over 90 | Other Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		0	0
Over 90 | Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		735	0
Total Past Due
Financing Receivable, Past Due [Line Items]
Past due		11,345	11,578
Total Past Due | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Past due		0	1,187
Total Past Due | Commercial & Industrial
Financing Receivable, Past Due [Line Items]
Past due		10	265
Total Past Due | Total Commercial
Financing Receivable, Past Due [Line Items]
Past due		10	1,452
Total Past Due | Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due		8,116	8,875
Total Past Due | Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Past due		3,196	1,235
Total Past Due | Other Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		23	16
Total Past Due | Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		$ 3,219	$ 1,251

[1] Includes net unamortized loan origination costs of $13.0 million and $11.6 million, respectively, at December 31, 2023 and 2022 and net unamortized premiums on loans purchased from and serviced by other financial institutions of $286 thousand and $318 thousand, respectively, at December 31, 2023 and 2022.

[2] CRE consists of commercial mortgages primarily secured by 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.

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