Loans (Past Due Loans) (Details) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Current		$ 4,262,514	$ 4,183,598
Total loans	[1]	4,272,925	4,195,990
Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Current		1,639,062	1,632,759
Total loans	[2]	1,639,062	1,633,024
Commercial & Industrial [Member]
Financing Receivable, Past Due [Line Items]
Current		641,552	817,405
Total loans	[3]	641,555	817,408
Total Commercial [Member]
Financing Receivable, Past Due [Line Items]
Current		2,280,614	2,450,164
Total loans		2,280,617	2,450,432
Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Current		1,717,353	1,456,973
Total loans	[4]	1,726,975	1,467,312
Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Current		246,932	257,518
Total loans		247,697	259,185
Other Consumer [Member]
Financing Receivable, Past Due [Line Items]
Current		17,615	18,943
Total loans	[5]	17,636	19,061
Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Current		264,547	276,461
Total loans		265,333	278,246
30-59
Financing Receivable, Past Due [Line Items]
Past due		2,388	5,649
30-59 | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due		0	265
30-59 | Commercial & Industrial [Member]
Financing Receivable, Past Due [Line Items]
Past due		3	1
30-59 | Total Commercial [Member]
Financing Receivable, Past Due [Line Items]
Past due		3	266
30-59 | Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due		1,784	4,466
30-59 | Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Past due		580	894
30-59 | Other Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		21	23
30-59 | Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		601	917
60-89
Financing Receivable, Past Due [Line Items]
Past due		3,253	839
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		0	2
60-89 | Total Commercial [Member]
Financing Receivable, Past Due [Line Items]
Past due		0	2
60-89 | Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due		3,176	701
60-89 | Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Past due		77	129
60-89 | Other Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		0	7
60-89 | Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		77	136
Over 90
Financing Receivable, Past Due [Line Items]
Past due		4,770	5,904
Over 90 | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due		0	0
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	0
Over 90 | Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due		4,662	5,172
Over 90 | Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Past due		108	644
Over 90 | Other Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		0	88
Over 90 | Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		108	732
Total Past Due
Financing Receivable, Past Due [Line Items]
Past due		10,411	12,392
Total Past Due | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due		0	265
Total Past Due | Commercial & Industrial [Member]
Financing Receivable, Past Due [Line Items]
Past due		3	3
Total Past Due | Total Commercial [Member]
Financing Receivable, Past Due [Line Items]
Past due		3	268
Total Past Due | Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Past due		9,622	10,339
Total Past Due | Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Past due		765	1,667
Total Past Due | Other Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		21	118
Total Past Due | Total Consumer [Member]
Financing Receivable, Past Due [Line Items]
Past due		$ 786	$ 1,785

[1] Includes net unamortized loan origination costs of $6.7 million and $1.5 million, respectively, at December 31, 2021 and 2020 and net unamortized premiums on loans purchased from and serviced by other financial institutions of $414 thousand and $787 thousand, respectively, at December 31, 2021 and 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 & 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 $38.0 million and $199.8 million, respectively, of PPP loans as of December 31, 2021 and 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.