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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, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment $ 4,156 $ 869
Impaired Loans with Specific Allowance: Related Allowance 1,445 260
Impaired Loans with No Specific Allowance: Recorded Investment 16,987 23,131
Total Impaired Loans: Recorded Investment 21,143 24,000
Total Impaired Loans: Unpaid Principal Balance 29,717 30,191
Commercial real estate- non owner-occupied [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 3,262 131
Impaired Loans with Specific Allowance: Related Allowance 1,337 23
Impaired Loans with No Specific Allowance: Recorded Investment 3,648 6,635
Total Impaired Loans: Recorded Investment 6,910 6,766
Total Impaired Loans: Unpaid Principal Balance 12,063 9,372
Commercial real estate- all other CRE [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 0 432
Impaired Loans with Specific Allowance: Related Allowance 0 154
Impaired Loans with No Specific Allowance: Recorded Investment 7,280 10,012
Total Impaired Loans: Recorded Investment 7,280 10,444
Total Impaired Loans: Unpaid Principal Balance 7,893 11,057
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 582 582
Total Impaired Loans: Recorded Investment 582 582
Total Impaired Loans: Unpaid Principal Balance 582 628
Acquisition and development- All other A&D [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 297 245
Impaired Loans with Specific Allowance: Related Allowance 42 40
Impaired Loans with No Specific Allowance: Recorded Investment 1,528 1,698
Total Impaired Loans: Recorded Investment 1,825 1,943
Total Impaired Loans: Unpaid Principal Balance 2,105 2,213
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 702 290
Total Impaired Loans: Recorded Investment 702 290
Total Impaired Loans: Unpaid Principal Balance 2,916 2,504
Residential mortgage- term [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 532 61
Impaired Loans with Specific Allowance: Related Allowance 64 43
Impaired Loans with No Specific Allowance: Recorded Investment 3,057 3,763
Total Impaired Loans: Recorded Investment 3,589 3,824
Total Impaired Loans: Unpaid Principal Balance 3,902 4,249
Residential mortgage- home equity [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Specific Allowance: Recorded Investment 65 0
Impaired Loans with Specific Allowance: Related Allowance 2 0
Impaired Loans with No Specific Allowance: Recorded Investment 190 151
Total Impaired Loans: Recorded Investment 255 151
Total Impaired Loans: Unpaid Principal Balance 256 168
Consumer [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 0 0
Total Impaired Loans: Recorded Investment 0 0
Total Impaired Loans: Unpaid Principal Balance $ 0 $ 0