Loans (Collateral Dependent Individually Analyzed Loans) (Details) - USD ($) $ in Thousands		Mar. 31, 2022	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[1]	$ 4,283,852	$ 4,272,925
Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		14,369	14,406
Related allowance		531	534
Commercial Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[2]	1,628,620	1,639,062
Commercial Real Estate | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[3]	10,593	10,603
Related allowance	[3]	0	0
Commercial & Industrial
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[4]	614,892	641,555
Commercial & Industrial | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[5]	0	0
Related allowance	[5]	0	0
Total Commercial
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		2,243,512	2,280,617
Total Commercial | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		10,593	10,603
Related allowance		0	0
Residential Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[6]	1,777,974	1,726,975
Residential Real Estate | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[7]	3,776	3,803
Related allowance	[7]	531	534
Home Equity
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		246,097	247,697
Home Equity | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[7]	0	0
Related allowance	[7]	0	0
Other
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[8]	16,269	17,636
Other | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		0	0
Related allowance		0	0
Total Consumer
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		262,366	265,333
Total Consumer | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		0	0
Related allowance		$ 0	$ 0

[1] Includes net unamortized loan origination costs of $8.3 million and $6.7 million, respectively, at March 31, 2022 and December 31, 2021 and net unamortized premiums on purchased loans of $389 thousand and $414 thousand, respectively, at March 31, 2022 and December 31, 2021.

[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] Secured by income-producing property.

[4] 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 $12.5 million and $38.0 million, respectively, of PPP loans as of March 31, 2022 and December 31, 2021.

[5] Secured by business assets.

[6] Residential real estate consists of mortgage and homeowner construction loans secured by one- to four-family residential properties.

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

[8] Other consists of loans to individuals secured by general aviation aircraft and other personal installment loans.