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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
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment $ 1,594 $ 2,634
Impaired Loans with Specific Allowance: Related Allowance 175 362
Impaired Loans with No Specific Allowance: Recorded Investment 10,945 12,317
Total Impaired Loans: Recorded Investment 12,539 14,951
Total Impaired Loans: Unpaid Principal Balance 22,927 24,983
Commercial real estate- non owner-occupied [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 124 1,711
Impaired Loans with Specific Allowance: Related Allowance 16 245
Impaired Loans with No Specific Allowance: Recorded Investment 689 1,907
Total Impaired Loans: Recorded Investment 813 3,618
Total Impaired Loans: Unpaid Principal Balance 8,598 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 6,625 5,458
Total Impaired Loans: Recorded Investment 6,625 5,458
Total Impaired Loans: Unpaid Principal Balance 6,625 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 457 527
Total Impaired Loans: Recorded Investment 457 527
Total Impaired Loans: Unpaid Principal Balance 457 527
Acquisition and development- All other A&D [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 234 295
Impaired Loans with Specific Allowance: Related Allowance 28 40
Impaired Loans with No Specific Allowance: Recorded Investment 42 154
Total Impaired Loans: Recorded Investment 276 449
Total Impaired Loans: Unpaid Principal Balance 367 722
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 305 668
Total Impaired Loans: Recorded Investment 305 668
Total Impaired Loans: Unpaid Principal Balance 2,519 2,882
Residential mortgage- term [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 1,213 598
Impaired Loans with Specific Allowance: Related Allowance 125 65
Impaired Loans with No Specific Allowance: Recorded Investment 2,274 3,023
Total Impaired Loans: Recorded Investment 3,487 3,621
Total Impaired Loans: Unpaid Principal Balance 3,772 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 553 580
Total Impaired Loans: Recorded Investment 553 580
Total Impaired Loans: Unpaid Principal Balance 566 593
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 23 30
Impaired Loans with Specific Allowance: Related Allowance 6 12
Impaired Loans with No Specific Allowance: Recorded Investment 0 0
Total Impaired Loans: Recorded Investment 23 30
Total Impaired Loans: Unpaid Principal Balance $ 23 $ 30