Loans (Collateral Dependent Individually Analyzed Loans) (Details) - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[1]	$ 4,282,047	$ 3,892,999
Related allowance			968
Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		7,510
Related allowance		378
Commercial Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[2]	1,665,745	1,547,572
Related allowance			0
Commercial Real Estate | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[3]	431
Related allowance	[3]	146
Commercial & Industrial
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[4]	822,269	585,289
Related allowance			580
Commercial & Industrial | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[5]	409
Related allowance	[5]	0
Total Commercial
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		2,488,014	2,132,861
Related allowance			580
Total Commercial | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		840
Related allowance		146
Residential Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[6]	1,506,726	1,449,090
Related allowance			95
Residential Real Estate | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[7]	5,845
Related allowance	[7]	0
Home Equity
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		268,551	290,874
Related allowance			291
Home Equity | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[7]	825
Related allowance	[7]	232
Other
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans	[8]	18,756	20,174
Related allowance			2
Other | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		0
Related allowance		0
Total Consumer
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		287,307	311,048
Related allowance			$ 293
Total Consumer | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Collateral dependent loans		825
Related allowance		$ 232

[1] Includes net unamortized loan origination fees of $670 thousand at September 30, 2020 and net unamortized loan origination costs of $5.3 million, at December 31, 2019 and net unamortized premiums on purchased loans of $919 thousand and $995 thousand, respectively, at September 30, 2020 and December 31, 2019.

[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 $216.8 million of PPP loans as of September 30, 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.