Loans (Summary of Loans) (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[1]	$ 4,194,666	$ 4,195,990
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[2]	1,618,540	1,633,024
Commercial & Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[3]	840,585	817,408
Total Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		2,459,125	2,450,432
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[4]	1,457,490	1,467,312
Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		256,799	259,185
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[5]	21,252	19,061
Total Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		$ 278,051	$ 278,246

[1] Includes net unamortized loan origination fees of $223 thousand at March 31, 2021 and net unamortized loan origination costs of $1.5 million, at December 31, 2020 and net unamortized premiums on purchased loans of $653 thousand and $787 thousand, respectively, at March 31, 2021 and December 31, 2020.

[2] Commercial real estate (“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] Commercial and industrial (“C&I”) consists of loans to businesses and individuals, a portion of which are fully or partially collateralized by real estate. C&I also includes $228.6 million and $199.8 million, respectively, of PPP loans as of March 31, 2021 and December 31, 2020.

[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.