Loans (Summary of Loans) (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[1]	$ 3,892,999	$ 3,680,360
Percent of total loans	[1]	100.00%	100.00%
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[2]	$ 1,547,572	$ 1,392,408
Percent of total loans	[2]	40.00%	38.00%
Commercial & Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[3]	$ 585,289	$ 620,704
Percent of total loans	[3]	15.00%	17.00%
Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		$ 2,132,861	$ 2,013,112
Percent of total loans		55.00%	55.00%
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[4]	$ 1,449,090	$ 1,360,387
Percent of total loans	[4]	37.00%	37.00%
Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		$ 290,874	$ 280,626
Percent of total loans		7.00%	8.00%
Other Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	[5]	$ 20,174	$ 26,235
Percent of total loans	[5]	1.00%	0.00%
Total Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		$ 311,048	$ 306,861
Percent of total loans		8.00%	8.00%

[1] Includes net unamortized loan origination costs of $5.3 million and $4.7 million, respectively, at December 31, 2019 and 2018 and net unamortized premiums on purchased loans of $995 thousand and $703 thousand, respectively, at December 31, 2019 and 2018.

[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.