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Loans and Related Allowance for Loan Losses (Impaired Loans and Related Interest Income by Loan Portfolio Class) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment $ 2,027 $ 2,634
Impaired Loans with Specific Allowance: Related Allowance 315 362
Impaired Loans with No Specific Allowance: Recorded Investment 8,591 12,317
Total Impaired Loans: Recorded Investment 10,618 14,951
Total Impaired Loans: Unpaid Principal Balance 20,945 24,983
Commercial real estate- non owner-occupied [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 685 1,711
Impaired Loans with Specific Allowance: Related Allowance 170 245
Impaired Loans with No Specific Allowance: Recorded Investment 46 1,907
Total Impaired Loans: Recorded Investment 731 3,618
Total Impaired Loans: Unpaid Principal Balance 8,516 10,579
Commercial real estate- all other CRE [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 0 0
Impaired Loans with Specific Allowance: Related Allowance 0 0
Impaired Loans with No Specific Allowance: Recorded Investment 5,070 5,458
Total Impaired Loans: Recorded Investment 5,070 5,458
Total Impaired Loans: Unpaid Principal Balance 5,070 5,731
Acquisition and development- 1-4 family residential construction [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 0 0
Impaired Loans with Specific Allowance: Related Allowance 0 0
Impaired Loans with No Specific Allowance: Recorded Investment 387 527
Total Impaired Loans: Recorded Investment 387 527
Total Impaired Loans: Unpaid Principal Balance 387 527
Acquisition and development- All other A&D [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 231 295
Impaired Loans with Specific Allowance: Related Allowance 27 40
Impaired Loans with No Specific Allowance: Recorded Investment 40 154
Total Impaired Loans: Recorded Investment 271 449
Total Impaired Loans: Unpaid Principal Balance 353 722
Commercial and industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 0 0
Impaired Loans with Specific Allowance: Related Allowance 0 0
Impaired Loans with No Specific Allowance: Recorded Investment 17 668
Total Impaired Loans: Recorded Investment 17 668
Total Impaired Loans: Unpaid Principal Balance 2,231 2,882
Residential mortgage- term [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 1,101 598
Impaired Loans with Specific Allowance: Related Allowance 115 65
Impaired Loans with No Specific Allowance: Recorded Investment 2,486 3,023
Total Impaired Loans: Recorded Investment 3,587 3,621
Total Impaired Loans: Unpaid Principal Balance 3,820 3,919
Residential mortgage- home equity [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 0 0
Impaired Loans with Specific Allowance: Related Allowance 0 0
Impaired Loans with No Specific Allowance: Recorded Investment 534 580
Total Impaired Loans: Recorded Investment 534 580
Total Impaired Loans: Unpaid Principal Balance 547 593
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 10 30
Impaired Loans with Specific Allowance: Related Allowance 3 12
Impaired Loans with No Specific Allowance: Recorded Investment 11 0
Total Impaired Loans: Recorded Investment 21 30
Total Impaired Loans: Unpaid Principal Balance $ 21 $ 30