Loans (Past Due Loans) (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Past due		$ 9,548	$ 12,392
Current		4,276,856	4,183,598
Total loans	[1]	4,286,404	4,195,990
30-59
Financing Receivable, Past Due [Line Items]
Past due		3,870	5,649
60-89
Financing Receivable, Past Due [Line Items]
Past due		2,648	839
Over 90
Financing Receivable, Past Due [Line Items]
Past due		3,030	5,904
Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Past due		0	265
Current		1,661,785	1,632,759
Total loans	[2]	1,661,785	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		2	3
Current		682,772	817,405
Total loans	[3]	682,774	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		1	2
Commercial & Industrial | Over 90
Financing Receivable, Past Due [Line Items]
Past due		0	0
Total Commercial
Financing Receivable, Past Due [Line Items]
Past due		2	268
Current		2,344,557	2,450,164
Total loans		2,344,559	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		1	2
Total Commercial | Over 90
Financing Receivable, Past Due [Line Items]
Past due		0	0
Residential Real Estate
Financing Receivable, Past Due [Line Items]
Past due		8,698	10,339
Current		1,663,666	1,456,973
Total loans	[4]	1,672,364	1,467,312
Residential Real Estate | 30-59
Financing Receivable, Past Due [Line Items]
Past due		3,452	4,466
Residential Real Estate | 60-89
Financing Receivable, Past Due [Line Items]
Past due		2,319	701
Residential Real Estate | Over 90
Financing Receivable, Past Due [Line Items]
Past due		2,927	5,172
Home Equity
Financing Receivable, Past Due [Line Items]
Past due		824	1,667
Current		249,050	257,518
Total loans		249,874	259,185
Home Equity | 30-59
Financing Receivable, Past Due [Line Items]
Past due		398	894
Home Equity | 60-89
Financing Receivable, Past Due [Line Items]
Past due		323	129
Home Equity | Over 90
Financing Receivable, Past Due [Line Items]
Past due		103	644
Other
Financing Receivable, Past Due [Line Items]
Past due		24	118
Current		19,583	18,943
Total loans	[5]	19,607	19,061
Other | 30-59
Financing Receivable, Past Due [Line Items]
Past due		19	23
Other | 60-89
Financing Receivable, Past Due [Line Items]
Past due		5	7
Other | Over 90
Financing Receivable, Past Due [Line Items]
Past due		0	88
Total Consumer
Financing Receivable, Past Due [Line Items]
Past due		848	1,785
Current		268,633	276,461
Total loans		269,481	278,246
Total Consumer | 30-59
Financing Receivable, Past Due [Line Items]
Past due		417	917
Total Consumer | 60-89
Financing Receivable, Past Due [Line Items]
Past due		328	136
Total Consumer | Over 90
Financing Receivable, Past Due [Line Items]
Past due		$ 103	$ 732

[1] Includes net unamortized loan origination costs of $5.0 million and $1.5 million, respectively, at September 30, 2021 and December 31, 2020 and net unamortized premiums on purchased loans of $489 thousand and $787 thousand, respectively, at September 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 $77.4 million and $199.8 million, respectively, of PPP loans as of September 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.