Loans (Past Due Loans) (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Past due loans		$ 15,689	$ 13,622
Current loans		3,877,310	3,666,738
Total loans	[1]	3,892,999	3,680,360
Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		1,433	1,080
Current loans		1,546,139	1,391,328
Total loans	[2]	1,547,572	1,392,408
Commercial & Industrial [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		1	0
Current loans		585,288	620,704
Total loans	[3]	585,289	620,704
Total Commercial [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		1,434	1,080
Current loans		2,131,427	2,012,032
Total loans		2,132,861	2,013,112
Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		11,429	10,520
Current loans		1,437,661	1,349,867
Total loans	[4]	1,449,090	1,360,387
Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		2,696	1,989
Current loans		288,178	278,637
Total loans		290,874	280,626
Other Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		130	33
Current loans		20,044	26,202
Total loans	[5]	20,174	26,235
Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		2,826	2,022
Current loans		308,222	304,839
Total loans		311,048	306,861
30-59
Financing Receivable, Past Due [Line Items]
Past due loans		6,418	7,787
30-59 | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		830	155
30-59 | Commercial & Industrial [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		1	0
30-59 | Total Commercial [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		831	155
30-59 | Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		4,574	6,318
30-59 | Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		971	1,281
30-59 | Other Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		42	33
30-59 | Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		1,013	1,314
60-89
Financing Receivable, Past Due [Line Items]
Past due loans		2,884	3,774
60-89 | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		0	925
60-89 | Commercial & Industrial [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		0	0
60-89 | Total Commercial [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		0	925
60-89 | Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		2,155	2,693
60-89 | Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		729	156
60-89 | Other Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		0	0
60-89 | Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		729	156
Over 90
Financing Receivable, Past Due [Line Items]
Past due loans		6,387	2,061
Over 90 | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		603	0
Over 90 | Commercial & Industrial [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		0	0
Over 90 | Total Commercial [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		603	0
Over 90 | Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		4,700	1,509
Over 90 | Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		996	552
Over 90 | Other Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		88	0
Over 90 | Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due loans		$ 1,084	$ 552

[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.