Loans (Past Due Loans) (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Current		$ 4,183,598	$ 3,877,310
Total loans	[1]	4,195,990	3,892,999
Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Current		1,632,759	1,546,139
Total loans	[2]	1,633,024	1,547,572
Commercial & Industrial [Member]
Financing Receivable, Past Due [Line Items]
Current		817,405	585,288
Total loans	[3]	817,408	585,289
Total Commercial [Member]
Financing Receivable, Past Due [Line Items]
Current		2,450,164	2,131,427
Total loans		2,450,432	2,132,861
Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Current		1,456,973	1,437,661
Total loans	[4]	1,467,312	1,449,090
Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Current		257,518	288,178
Total loans		259,185	290,874
Other Consumer [Member]
Financing Receivable, Past Due [Line Items]
Current		18,943	20,044
Total loans	[5]	19,061	20,174
Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Current		276,461	308,222
Total loans		278,246	311,048
30-59
Financing Receivable, Past Due [Line Items]
Past due		5,649	6,418
30-59 | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due		265	830
30-59 | Commercial & Industrial [Member]
Financing Receivable, Past Due [Line Items]
Past due		1	1
30-59 | Total Commercial [Member]
Financing Receivable, Past Due [Line Items]
Past due		266	831
30-59 | Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due		4,466	4,574
30-59 | Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Past due		894	971
30-59 | Other Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		23	42
30-59 | Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		917	1,013
60-89
Financing Receivable, Past Due [Line Items]
Past due		839	2,884
60-89 | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due		0	0
60-89 | Commercial & Industrial [Member]
Financing Receivable, Past Due [Line Items]
Past due		2	0
60-89 | Total Commercial [Member]
Financing Receivable, Past Due [Line Items]
Past due		2	0
60-89 | Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due		701	2,155
60-89 | Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Past due		129	729
60-89 | Other Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		7	0
60-89 | Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		136	729
Over 90
Financing Receivable, Past Due [Line Items]
Past due		5,904	6,387
Over 90 | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due		0	603
Over 90 | Commercial & Industrial [Member]
Financing Receivable, Past Due [Line Items]
Past due		0	0
Over 90 | Total Commercial [Member]
Financing Receivable, Past Due [Line Items]
Past due		0	603
Over 90 | Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due		5,172	4,700
Over 90 | Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Past due		644	996
Over 90 | Other Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		88	88
Over 90 | Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		732	1,084
Total Past Due
Financing Receivable, Past Due [Line Items]
Past due		12,392	15,689
Total Past Due | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due		265	1,433
Total Past Due | Commercial & Industrial [Member]
Financing Receivable, Past Due [Line Items]
Past due		3	1
Total Past Due | Total Commercial [Member]
Financing Receivable, Past Due [Line Items]
Past due		268	1,434
Total Past Due | Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due		10,339	11,429
Total Past Due | Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Past due		1,667	2,696
Total Past Due | Other Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		118	130
Total Past Due | Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		$ 1,785	$ 2,826

[1] Includes net unamortized loan origination costs of $1.5 million and $5.3 million, respectively, at December 31, 2020 and 2019 and net unamortized premiums on purchased loans of $787 thousand and $995 thousand, respectively, at December 31, 2020 and 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 & 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 $199.8 million of PPP loans as of 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.