Loans (Collateral Dependent Individually Analyzed Loans) (Details) - USD ($) $ in Thousands		Jun. 30, 2021		Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[1]	$ 4,299,800		$ 4,195,990
Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		4,256		8,444
Related allowance		240		221
Commercial Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[2]	1,669,624		1,633,024
Commercial Real Estate | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		0	[3]	1,792
Related allowance		0	[3]	0
Commercial & Industrial
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[4]	764,509		817,408
Commercial & Industrial | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		537	[5]	451
Related allowance		0	[5]	0
Total Commercial
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		2,434,133		2,450,432
Total Commercial | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		537		2,243
Related allowance		0		0
Residential Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[6]	1,590,389		1,467,312
Residential Real Estate | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		3,325	[7]	5,947
Related allowance		57	[7]	38
Home Equity
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		254,802		259,185
Home Equity | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		394	[7]	254
Related allowance		183	[7]	183
Other
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[8]	20,476		19,061
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		275,278		278,246
Total Consumer | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		394		254
Related allowance		$ 183		$ 183

[1] Includes net unamortized loan origination costs of $2.1 million and $1.5 million, respectively, at June 30, 2021 and December 31, 2020 and net unamortized premiums on purchased loans of $558 thousand and $787 thousand, respectively, at June 30, 2021 and December 31, 2020.

[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] Secured by income-producing property.

[4] Commercial and 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 $147.0 million and $199.8 million, respectively, of PPP loans as of June 30, 2021 and December 31, 2020.

[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.