Loans (Collateral Dependent Individually Analyzed Loans) (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	[1]	$ 4,090,396	$ 3,892,999
Related allowance			968
Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Carrying value		1,391
Related allowance		529
Commercial Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	[2]	1,618,020	1,547,572
Related allowance			0
Commercial Real Estate | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	[3]	450
Related allowance	[3]	6
Commercial & Industrial
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	[4]	655,157	585,289
Related allowance			580
Commercial & Industrial | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	[5]	290
Related allowance	[5]	290
Total Commercial
Loans and Leases Receivable Disclosure [Line Items]
Carrying value		2,273,177	2,132,861
Related allowance			580
Total Commercial | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Carrying value		740
Related allowance		296
Residential Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	[6]	1,510,472	1,449,090
Related allowance			95
Residential Real Estate | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	[7]	418
Related allowance	[7]	0
Home Equity
Loans and Leases Receivable Disclosure [Line Items]
Carrying value		287,134	290,874
Related allowance			291
Home Equity | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	[7]	233
Related allowance	[7]	233
Other
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	[8]	19,613	20,174
Related allowance			2
Other | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Carrying value		0
Related allowance		0
Total Consumer
Loans and Leases Receivable Disclosure [Line Items]
Carrying value		306,747	311,048
Related allowance			$ 293
Total Consumer | Collateral Dependent Individually Analyzed
Loans and Leases Receivable Disclosure [Line Items]
Carrying value		233
Related allowance		$ 233

[1] Includes net unamortized loan origination costs of $5.2 million and $5.3 million, respectively, at March 31, 2020 and December 31, 2019 and net unamortized premiums on purchased loans of $724 thousand and $995 thousand, respectively, at March 31, 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 substantial portion of which are fully or partially collateralized by real estate.

[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.