Loans (Past Due Loans) (Details) - USD ($) $ in Thousands		Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Past due		$ 9,733	$ 11,578
Current		5,601,382	5,098,561
Total loans	[1]	5,611,115	5,110,139
30-59
Financing Receivable, Past Due [Line Items]
Past due		5,631	7,364
60-89
Financing Receivable, Past Due [Line Items]
Past due		2,628	435
Over 90
Financing Receivable, Past Due [Line Items]
Past due		1,474	3,779
Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Past due		0	1,187
Current		2,063,383	1,828,117
Total loans	[2]	2,063,383	1,829,304
Commercial Real Estate | 30-59
Financing Receivable, Past Due [Line Items]
Past due		0	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		4	265
Current		611,561	656,132
Total loans	[3]	611,565	656,397
Commercial & Industrial | 30-59
Financing Receivable, Past Due [Line Items]
Past due		3	265
Commercial & Industrial | 60-89
Financing Receivable, Past Due [Line Items]
Past due		1	0
Commercial & Industrial | Over 90
Financing Receivable, Past Due [Line Items]
Past due		0	0
Total Commercial
Financing Receivable, Past Due [Line Items]
Past due		4	1,452
Current		2,674,944	2,484,249
Total loans		2,674,948	2,485,701
Total Commercial | 30-59
Financing Receivable, Past Due [Line Items]
Past due		3	1,452
Total Commercial | 60-89
Financing Receivable, Past Due [Line Items]
Past due		1	0
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		7,785	8,875
Current		2,603,315	2,314,127
Total loans	[4]	2,611,100	2,323,002
Residential Real Estate | 30-59
Financing Receivable, Past Due [Line Items]
Past due		3,789	4,793
Residential Real Estate | 60-89
Financing Receivable, Past Due [Line Items]
Past due		2,562	303
Residential Real Estate | Over 90
Financing Receivable, Past Due [Line Items]
Past due		1,434	3,779
Home Equity
Financing Receivable, Past Due [Line Items]
Past due		1,925	1,235
Current		303,758	284,480
Total loans		305,683	285,715
Home Equity | 30-59
Financing Receivable, Past Due [Line Items]
Past due		1,823	1,103
Home Equity | 60-89
Financing Receivable, Past Due [Line Items]
Past due		62	132
Home Equity | Over 90
Financing Receivable, Past Due [Line Items]
Past due		40	0
Other
Financing Receivable, Past Due [Line Items]
Past due		19	16
Current		19,365	15,705
Total loans	[5]	19,384	15,721
Other | 30-59
Financing Receivable, Past Due [Line Items]
Past due		16	16
Other | 60-89
Financing Receivable, Past Due [Line Items]
Past due		3	0
Other | Over 90
Financing Receivable, Past Due [Line Items]
Past due		0	0
Total Consumer
Financing Receivable, Past Due [Line Items]
Past due		1,944	1,251
Current		323,123	300,185
Total loans		325,067	301,436
Total Consumer | 30-59
Financing Receivable, Past Due [Line Items]
Past due		1,839	1,119
Total Consumer | 60-89
Financing Receivable, Past Due [Line Items]
Past due		65	132
Total Consumer | Over 90
Financing Receivable, Past Due [Line Items]
Past due		$ 40	$ 0

[1] Includes net unamortized loan origination costs of $12.8 million and $11.6 million, respectively, at September 30, 2023 and December 31, 2022 and net unamortized premiums on loans purchased from and serviced by other financial institutions of $296 thousand and $318 thousand, respectively, at September 30, 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.