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Allowance for Loan Losses (Allowance for Loan Losses by Segment & Impairment Methodology) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment $ 16,816 $ 20,598
Loans related allowance individually evaluated for impairment 127 1,129
Loans collectively evaluated for impairment 3,663,544 3,353,473
Loans related allowance collectively evaluated for impairment 26,945 25,359
Total loans [1] 3,680,360 3,374,071
Allowance 27,072 26,488
Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 925 4,954
Loans related allowance individually evaluated for impairment 0 1,018
Loans collectively evaluated for impairment 1,391,483 1,205,541
Loans related allowance collectively evaluated for impairment 15,381 11,711
Total loans [2] 1,392,408 1,210,495
Commercial & Industrial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 4,714 5,157
Loans related allowance individually evaluated for impairment 0 1
Loans collectively evaluated for impairment 615,990 607,177
Loans related allowance collectively evaluated for impairment 5,847 5,579
Total loans [3] 620,704 612,334
Total Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 5,639 10,111
Loans related allowance individually evaluated for impairment 0 1,019
Loans collectively evaluated for impairment 2,007,473 1,812,718
Loans related allowance collectively evaluated for impairment 21,228 17,290
Total loans 2,013,112 1,822,829
Residential Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 9,710 9,783
Loans related allowance individually evaluated for impairment 100 104
Loans collectively evaluated for impairment 1,350,677 1,217,465
Loans related allowance collectively evaluated for impairment 3,887 5,323
Total loans [4] 1,360,387 1,227,248
Home Equity [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 1,445 557
Loans related allowance individually evaluated for impairment 24 0
Loans collectively evaluated for impairment 279,182 291,910
Loans related allowance collectively evaluated for impairment 1,579 2,412
Total loans 280,626 292,467
Other Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 22 147
Loans related allowance individually evaluated for impairment 3 6
Loans collectively evaluated for impairment 26,212 31,380
Loans related allowance collectively evaluated for impairment 251 334
Total loans [5] 26,235 31,527
Total Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 1,467 704
Loans related allowance individually evaluated for impairment 27 6
Loans collectively evaluated for impairment 305,394 323,290
Loans related allowance collectively evaluated for impairment 1,830 2,746
Total loans $ 306,861 $ 323,994
[1] Includes net unamortized loan origination costs of $4.7 million and $3.8 million, respectively, at December 31, 2018 and 2017 and net unamortized premiums on purchased loans of $703 thousand and $878 thousand, respectively, at December 31, 2018 and 2017.
[2] 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] Consists of loans to businesses and individuals, a substantial portion of which are fully or partially collateralized by real estate.
[4] Consists of mortgage and homeowner construction loans secured by one- to four- family residential properties.
[5] Consists of loans to individuals secured by general aviation aircraft and other personal installment loans.