Loans (Collateral dependent individually analyzed loans) (Details) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
Total loans	[1]	$ 5,647,706	$ 5,110,139
Commercial Real Estate
Total loans	[2]	2,106,359	1,829,304
Commercial & Industrial
Total loans	[3]	605,072	656,397
Total Commercial
Total loans		2,711,431	2,485,701
Residential Real Estate [Member]
Total loans	[4]	2,604,478	2,323,002
Home Equity [Member]
Total loans		312,594	285,715
Other Consumer [Member]
Total loans	[5]	19,203	15,721
Total Consumer [Member]
Total loans		331,797	301,436
Collateral Dependent Individually Analyzed [Member]
Total loans		34,640	8,455
Related allowance on individually analyzed loans		97	0
Collateral Dependent Individually Analyzed [Member] | Commercial Real Estate
Total loans	[6]	32,827	2,103
Related allowance on individually analyzed loans	[6]	97	0
Collateral Dependent Individually Analyzed [Member] | Commercial & Industrial
Total loans	[7]	682	0
Related allowance on individually analyzed loans	[7]	0	0
Collateral Dependent Individually Analyzed [Member] | Total Commercial
Total loans		33,509	2,103
Related allowance on individually analyzed loans		97	0
Collateral Dependent Individually Analyzed [Member] | Residential Real Estate [Member]
Total loans	[8]	1,131	5,760
Related allowance on individually analyzed loans	[8]	0	0
Collateral Dependent Individually Analyzed [Member] | Home Equity [Member]
Total loans	[8]	0	592
Related allowance on individually analyzed loans	[8]	0	0
Collateral Dependent Individually Analyzed [Member] | Other Consumer [Member]
Total loans		0	0
Related allowance on individually analyzed loans		0	0
Collateral Dependent Individually Analyzed [Member] | Total Consumer [Member]
Total loans		0	592
Related allowance on individually analyzed loans		$ 0	$ 0

[1] Includes net unamortized loan origination costs of $13.0 million and $11.6 million, respectively, at December 31, 2023 and 2022 and net unamortized premiums on loans purchased from and serviced by other financial institutions of $286 thousand and $318 thousand, respectively, at December 31, 2023 and 2022.

[2] 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] C&I consists of loans to businesses and individuals, a portion of which are fully or partially collateralized by real estate.

[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.