Loans (Summary of Loans) (Details) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[1]	$ 5,685,232	$ 5,647,706
Net unamortized loan origination costs		13,100	13,000
Net unamortized premiums on purchased loans		273	286
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[2]	2,158,518	2,106,359
Commercial & Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[3]	613,376	605,072
Total Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		2,771,894	2,711,431
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[4]	2,585,524	2,604,478
Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		309,302	312,594
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[5]	18,512	19,203
Total Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		$ 327,814	$ 331,797

[1] Includes net unamortized loan origination costs of $13.1 million and $13.0 million, respectively, at March 31, 2024 and December 31, 2023 and net unamortized premiums on loans purchased from and serviced by other financial institutions of $273 thousand and $286 thousand, respectively, at March 31, 2024 and December 31, 2023.

[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.