Loans (Past Due Loans) (Details) - USD ($) $ in Thousands		Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Past due		$ 7,995	$ 11,578
Current		5,219,974	5,098,561
Total loans	[1]	5,227,969	5,110,139
30-59
Financing Receivable, Past Due [Line Items]
Past due		4,559	7,364
60-89
Financing Receivable, Past Due [Line Items]
Past due		706	435
Over 90
Financing Receivable, Past Due [Line Items]
Past due		2,730	3,779
Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Past due		1,188	1,187
Current		1,907,948	1,828,117
Total loans	[2]	1,909,136	1,829,304
Commercial Real Estate | 30-59
Financing Receivable, Past Due [Line Items]
Past due		1,188	1,187
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		229	265
Current		609,491	656,132
Total loans	[3]	609,720	656,397
Commercial & Industrial | 30-59
Financing Receivable, Past Due [Line Items]
Past due		5	265
Commercial & Industrial | 60-89
Financing Receivable, Past Due [Line Items]
Past due		0	0
Commercial & Industrial | Over 90
Financing Receivable, Past Due [Line Items]
Past due		224	0
Total Commercial
Financing Receivable, Past Due [Line Items]
Past due		1,417	1,452
Current		2,517,439	2,484,249
Total loans		2,518,856	2,485,701
Total Commercial | 30-59
Financing Receivable, Past Due [Line Items]
Past due		1,193	1,452
Total Commercial | 60-89
Financing Receivable, Past Due [Line Items]
Past due		0	0
Total Commercial | Over 90
Financing Receivable, Past Due [Line Items]
Past due		224	0
Residential Real Estate
Financing Receivable, Past Due [Line Items]
Past due		5,730	8,875
Current		2,397,525	2,314,127
Total loans	[4]	2,403,255	2,323,002
Residential Real Estate | 30-59
Financing Receivable, Past Due [Line Items]
Past due		2,581	4,793
Residential Real Estate | 60-89
Financing Receivable, Past Due [Line Items]
Past due		643	303
Residential Real Estate | Over 90
Financing Receivable, Past Due [Line Items]
Past due		2,506	3,779
Home Equity
Financing Receivable, Past Due [Line Items]
Past due		833	1,235
Current		288,045	284,480
Total loans		288,878	285,715
Home Equity | 30-59
Financing Receivable, Past Due [Line Items]
Past due		770	1,103
Home Equity | 60-89
Financing Receivable, Past Due [Line Items]
Past due		63	132
Home Equity | Over 90
Financing Receivable, Past Due [Line Items]
Past due		0	0
Other
Financing Receivable, Past Due [Line Items]
Past due		15	16
Current		16,965	15,705
Total loans	[5]	16,980	15,721
Other | 30-59
Financing Receivable, Past Due [Line Items]
Past due		15	16
Other | 60-89
Financing Receivable, Past Due [Line Items]
Past due		0	0
Other | Over 90
Financing Receivable, Past Due [Line Items]
Past due		0	0
Total Consumer
Financing Receivable, Past Due [Line Items]
Past due		848	1,251
Current		305,010	300,185
Total loans		305,858	301,436
Total Consumer | 30-59
Financing Receivable, Past Due [Line Items]
Past due		785	1,119
Total Consumer | 60-89
Financing Receivable, Past Due [Line Items]
Past due		63	132
Total Consumer | Over 90
Financing Receivable, Past Due [Line Items]
Past due		$ 0	$ 0

[1] Includes net unamortized loan origination costs of $11.9 million and $11.6 million, respectively, at March 31, 2023 and December 31, 2022 and net unamortized premiums on loans purchased from and serviced by other financial institutions of $310 thousand and $318 thousand, respectively, at March 31, 2023 and December 31, 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.