Loans (Past Due Loans) (Details) - USD ($) $ in Thousands		Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Past due		$ 8,455	$ 12,392
Current		4,291,345	4,183,598
Total loans	[1]	4,299,800	4,195,990
30-59
Financing Receivable, Past Due [Line Items]
Past due		3,675	5,649
60-89
Financing Receivable, Past Due [Line Items]
Past due		216	839
Over 90
Financing Receivable, Past Due [Line Items]
Past due		4,564	5,904
Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Past due		0	265
Current		1,669,624	1,632,759
Total loans	[2]	1,669,624	1,633,024
Commercial Real Estate | 30-59
Financing Receivable, Past Due [Line Items]
Past due		0	265
Commercial Real Estate | 60-89
Financing Receivable, Past Due [Line Items]
Past due		0	0
Commercial Real Estate | Over 90
Financing Receivable, Past Due [Line Items]
Past due		0	0
Commercial & Industrial
Financing Receivable, Past Due [Line Items]
Past due		540	3
Current		763,969	817,405
Total loans	[3]	764,509	817,408
Commercial & Industrial | 30-59
Financing Receivable, Past Due [Line Items]
Past due		1	1
Commercial & Industrial | 60-89
Financing Receivable, Past Due [Line Items]
Past due		0	2
Commercial & Industrial | Over 90
Financing Receivable, Past Due [Line Items]
Past due		539	0
Total Commercial
Financing Receivable, Past Due [Line Items]
Past due		540	268
Current		2,433,593	2,450,164
Total loans		2,434,133	2,450,432
Total Commercial | 30-59
Financing Receivable, Past Due [Line Items]
Past due		1	266
Total Commercial | 60-89
Financing Receivable, Past Due [Line Items]
Past due		0	2
Total Commercial | Over 90
Financing Receivable, Past Due [Line Items]
Past due		539	0
Residential Real Estate
Financing Receivable, Past Due [Line Items]
Past due		6,656	10,339
Current		1,583,733	1,456,973
Total loans	[4]	1,590,389	1,467,312
Residential Real Estate | 30-59
Financing Receivable, Past Due [Line Items]
Past due		3,055	4,466
Residential Real Estate | 60-89
Financing Receivable, Past Due [Line Items]
Past due		0	701
Residential Real Estate | Over 90
Financing Receivable, Past Due [Line Items]
Past due		3,601	5,172
Home Equity
Financing Receivable, Past Due [Line Items]
Past due		1,231	1,667
Current		253,571	257,518
Total loans		254,802	259,185
Home Equity | 30-59
Financing Receivable, Past Due [Line Items]
Past due		595	894
Home Equity | 60-89
Financing Receivable, Past Due [Line Items]
Past due		212	129
Home Equity | Over 90
Financing Receivable, Past Due [Line Items]
Past due		424	644
Other
Financing Receivable, Past Due [Line Items]
Past due		28	118
Current		20,448	18,943
Total loans	[5]	20,476	19,061
Other | 30-59
Financing Receivable, Past Due [Line Items]
Past due		24	23
Other | 60-89
Financing Receivable, Past Due [Line Items]
Past due		4	7
Other | Over 90
Financing Receivable, Past Due [Line Items]
Past due		0	88
Total Consumer
Financing Receivable, Past Due [Line Items]
Past due		1,259	1,785
Current		274,019	276,461
Total loans		275,278	278,246
Total Consumer | 30-59
Financing Receivable, Past Due [Line Items]
Past due		619	917
Total Consumer | 60-89
Financing Receivable, Past Due [Line Items]
Past due		216	136
Total Consumer | Over 90
Financing Receivable, Past Due [Line Items]
Past due		$ 424	$ 732

[1] Includes net unamortized loan origination costs of $2.1 million and $1.5 million, respectively, at June 30, 2021 and December 31, 2020 and net unamortized premiums on purchased loans of $558 thousand and $787 thousand, respectively, at June 30, 2021 and December 31, 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 and 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 $147.0 million and $199.8 million, respectively, of PPP loans as of June 30, 2021 and 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.