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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
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment $ 2,792 $ 2,634
Impaired Loans with Specific Allowance: Related Allowance 821 362
Impaired Loans with No Specific Allowance: Recorded Investment 9,252 12,317
Total Impaired Loans: Recorded Investment 12,044 14,951
Total Impaired Loans: Unpaid Principal Balance 21,713 24,983
Commercial real estate- non owner-occupied [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 1,648 1,711
Impaired Loans with Specific Allowance: Related Allowance 633 245
Impaired Loans with No Specific Allowance: Recorded Investment 54 1,907
Total Impaired Loans: Recorded Investment 1,702 3,618
Total Impaired Loans: Unpaid Principal Balance 8,663 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 4,826 5,458
Total Impaired Loans: Recorded Investment 4,826 5,458
Total Impaired Loans: Unpaid Principal Balance 4,826 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 527 527
Total Impaired Loans: Recorded Investment 527 527
Total Impaired Loans: Unpaid Principal Balance 527 527
Acquisition and development- All other A&D [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 236 295
Impaired Loans with Specific Allowance: Related Allowance 30 40
Impaired Loans with No Specific Allowance: Recorded Investment 167 154
Total Impaired Loans: Recorded Investment 403 449
Total Impaired Loans: Unpaid Principal Balance 571 722
Commercial and industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 10 0
Impaired Loans with Specific Allowance: Related Allowance 10 0
Impaired Loans with No Specific Allowance: Recorded Investment 307 668
Total Impaired Loans: Recorded Investment 317 668
Total Impaired Loans: Unpaid Principal Balance 2,531 2,882
Residential mortgage- term [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 788 598
Impaired Loans with Specific Allowance: Related Allowance 104 65
Impaired Loans with No Specific Allowance: Recorded Investment 2,782 3,023
Total Impaired Loans: Recorded Investment 3,570 3,621
Total Impaired Loans: Unpaid Principal Balance 3,883 3,919
Residential mortgage- home equity [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 85 0
Impaired Loans with Specific Allowance: Related Allowance 37 0
Impaired Loans with No Specific Allowance: Recorded Investment 589 580
Total Impaired Loans: Recorded Investment 674 580
Total Impaired Loans: Unpaid Principal Balance 687 593
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 25 30
Impaired Loans with Specific Allowance: Related Allowance 7 12
Impaired Loans with No Specific Allowance: Recorded Investment 0 0
Total Impaired Loans: Recorded Investment 25 30
Total Impaired Loans: Unpaid Principal Balance $ 25 $ 30