Loans (Summary of Loans) (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[1]	$ 4,090,396	$ 3,892,999
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[2]	1,618,020	1,547,572
Commercial & Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[3]	655,157	585,289
Total Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		2,273,177	2,132,861
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[4]	1,510,472	1,449,090
Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		287,134	290,874
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[5]	19,613	20,174
Total Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		$ 306,747	$ 311,048

[1] Includes net unamortized loan origination costs of $5.2 million and $5.3 million, respectively, at March 31, 2020 and December 31, 2019 and net unamortized premiums on purchased loans of $724 thousand and $995 thousand, respectively, at March 31, 2020 and December 31, 2019.

[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 substantial 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.