Loans (Summary of Loans) (Details) - USD ($) $ in Thousands		Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[1]	$ 5,227,969	$ 5,110,139
Net unamortized loan origination costs		11,900	11,600
Net unamortized premiums on purchased loans		310	318
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[2]	1,909,136	1,829,304
Commercial & Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[3]	609,720	656,397
Total Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		2,518,856	2,485,701
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[4]	2,403,255	2,323,002
Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		288,878	285,715
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[5]	16,980	15,721
Total Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		$ 305,858	$ 301,436

[1] Includes net unamortized loan origination costs of $11.9 million and $11.6 million, respectively, at March 31, 2023 and December 31, 2022 and net unamortized premiums on loans purchased from and serviced by other financial institutions of $310 thousand and $318 thousand, respectively, at March 31, 2023 and December 31, 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.