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Allowance for Loan Losses (Allowance for Loan Losses by Segment & Impairment Methodology) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment $ 15,945 $ 20,598
Loans related allowance individually evaluated for impairment 112 1,129
Loans collectively evaluated for impairment 3,540,258 3,353,473
Loans related allowance collectively evaluated for impairment 26,397 25,359
Total loans [1] 3,556,203 3,374,071
Allowance 26,509 26,488
Commercial Real Estate    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 0 4,954
Loans related allowance individually evaluated for impairment 0 1,018
Loans collectively evaluated for impairment 1,240,350 1,205,541
Loans related allowance collectively evaluated for impairment 13,495 11,711
Total loans [2] 1,240,350 1,210,495
Commercial & Industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 4,860 5,157
Loans related allowance individually evaluated for impairment 0 1
Loans collectively evaluated for impairment 652,022 607,177
Loans related allowance collectively evaluated for impairment 7,247 5,579
Total loans [3] 656,882 612,334
Total Commercial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 4,860 10,111
Loans related allowance individually evaluated for impairment 0 1,019
Loans collectively evaluated for impairment 1,892,372 1,812,718
Loans related allowance collectively evaluated for impairment 20,742 17,290
Total loans 1,897,232 1,822,829
Residential Real Estate    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 9,428 9,783
Loans related allowance individually evaluated for impairment 101 104
Loans collectively evaluated for impairment 1,339,912 1,217,465
Loans related allowance collectively evaluated for impairment 4,014 5,323
Total loans [4] 1,349,340 1,227,248
Home Equity    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 1,635 557
Loans related allowance individually evaluated for impairment 9 0
Loans collectively evaluated for impairment 280,696 291,910
Loans related allowance collectively evaluated for impairment 1,380 2,412
Total loans 282,331 292,467
Other    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 22 147
Loans related allowance individually evaluated for impairment 2 6
Loans collectively evaluated for impairment 27,278 31,380
Loans related allowance collectively evaluated for impairment 261 334
Total loans [5] 27,300 31,527
Total Consumer    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 1,657 704
Loans related allowance individually evaluated for impairment 11 6
Loans collectively evaluated for impairment 307,974 323,290
Loans related allowance collectively evaluated for impairment 1,641 2,746
Total loans $ 309,631 $ 323,994
[1] Includes net unamortized loan origination costs of $4.8 million and $3.8 million, respectively, at September 30, 2018 and December 31, 2017 and net unamortized premiums on purchased loans of $746 thousand and $878 thousand, respectively, at September 30, 2018 and December 31, 2017.
[2] Commercial real estate loans consist 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] Commercial & industrial consist of loans to businesses and individuals, a substantial portion of which are fully or partially collateralized by real estate.
[4] Residential real estate loans consist of mortgage and homeowner construction loans secured by one- to four- family residential properties.
[5] Other consumer loans consists of loans to individuals secured by general aviation aircraft and other personal installment loans.