Loans (Collateral dependent individually analyzed loans) (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Total loans	[1]	$ 4,195,990	$ 3,892,999
Related allowance on individually analyzed loans			968
Commercial Real Estate [Member]
Total loans	[2]	1,633,024	1,547,572
Related allowance on individually analyzed loans			0
Commercial & Industrial [Member]
Total loans	[3]	817,408	585,289
Related allowance on individually analyzed loans			580
Total Commercial [Member]
Total loans		2,450,432	2,132,861
Related allowance on individually analyzed loans			580
Residential Real Estate [Member]
Total loans	[4]	1,467,312	1,449,090
Related allowance on individually analyzed loans			95
Home Equity [Member]
Total loans		259,185	290,874
Related allowance on individually analyzed loans			291
Other Consumer [Member]
Total loans	[5]	19,061	20,174
Related allowance on individually analyzed loans			2
Total Consumer [Member]
Total loans		278,246	311,048
Related allowance on individually analyzed loans			$ 293
Collateral Dependent Individually Analyzed [Member]
Total loans		8,444
Related allowance on individually analyzed loans		221
Collateral Dependent Individually Analyzed [Member] | Commercial Real Estate [Member]
Total loans	[6]	1,792
Related allowance on individually analyzed loans	[6]	0
Collateral Dependent Individually Analyzed [Member] | Commercial & Industrial [Member]
Total loans	[7]	451
Related allowance on individually analyzed loans	[7]	0
Collateral Dependent Individually Analyzed [Member] | Total Commercial [Member]
Total loans		2,243
Related allowance on individually analyzed loans		0
Collateral Dependent Individually Analyzed [Member] | Residential Real Estate [Member]
Total loans	[8]	5,947
Related allowance on individually analyzed loans	[8]	38
Collateral Dependent Individually Analyzed [Member] | Home Equity [Member]
Total loans	[8]	254
Related allowance on individually analyzed loans	[8]	183
Collateral Dependent Individually Analyzed [Member] | Other Consumer [Member]
Total loans		0
Related allowance on individually analyzed loans		0
Collateral Dependent Individually Analyzed [Member] | Total Consumer [Member]
Total loans		254
Related allowance on individually analyzed loans		$ 183

[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.

[6] Secured by income-producing property.

[7] Secured by business assets.

[8] Secured by one- to four-family residential properties.