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Allowance for Loan Losses (Allowance for Loan Losses by Segment & Impairment Methodology) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment $ 17,491 $ 20,598
Loans related allowance individually evaluated for impairment 198 1,129
Loans collectively evaluated for impairment 3,472,739 3,353,473
Loans related allowance collectively evaluated for impairment 25,976 25,359
Total loans [1] 3,490,230 3,374,071
Allowance 26,174 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 1,218,643 1,205,541
Loans related allowance collectively evaluated for impairment 12,443 11,711
Total loans [2] 1,218,643 1,210,495
Commercial & Industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 5,742 5,157
Loans related allowance individually evaluated for impairment 18 1
Loans collectively evaluated for impairment 626,287 607,177
Loans related allowance collectively evaluated for impairment 6,624 5,579
Total loans [3] 632,029 612,334
Total Commercial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 5,742 10,111
Loans related allowance individually evaluated for impairment 18 1,019
Loans collectively evaluated for impairment 1,844,930 1,812,718
Loans related allowance collectively evaluated for impairment 19,067 17,290
Total loans 1,850,672 1,822,829
Residential Real Estate    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 10,572 9,783
Loans related allowance individually evaluated for impairment 168 104
Loans collectively evaluated for impairment 1,316,846 1,217,465
Loans related allowance collectively evaluated for impairment 5,146 5,323
Total loans [4] 1,327,418 1,227,248
Home Equity    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 1,144 557
Loans related allowance individually evaluated for impairment 8 0
Loans collectively evaluated for impairment 282,600 291,910
Loans related allowance collectively evaluated for impairment 1,367 2,412
Total loans 283,744 292,467
Other    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 33 147
Loans related allowance individually evaluated for impairment 4 6
Loans collectively evaluated for impairment 28,363 31,380
Loans related allowance collectively evaluated for impairment 396 334
Total loans [5] 28,396 31,527
Total Consumer    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 1,177 704
Loans related allowance individually evaluated for impairment 12 6
Loans collectively evaluated for impairment 310,963 323,290
Loans related allowance collectively evaluated for impairment 1,763 2,746
Total loans $ 312,140 $ 323,994
[1] Includes net unamortized loan origination costs of $4.5 million and $3.8 million, respectively, at June 30, 2018 and December 31, 2017 and net unamortized premiums on purchased loans of $794 thousand and $878 thousand, respectively, at June 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.