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Loans (Impaired Loans by Loan Classification) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]    
Recorded Investment, with a valuation allowance
Unpaid Principal Balance, with a valuation allowance
Associated Allowance, with a valuation allowance
Average Recorded Investment, with a valuation allowance
Interest Income Recognized, with a valuation allowance
Recorded Investment, total $ 1,685 $ 1,697
Unpaid Principal Balance, total $ 1,770 $ 1,757
Associated Allowance, total
Average Recorded Investment, total $ 1,903 $ 1,736
Interest Income Recognized, total 54 80
Commercial and industrial - organic [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, without a valuation allowance 47  
Unpaid Principal Balance, without a valuation allowance $ 65  
Associated Allowance, without a valuation allowance  
Average Recorded Investment, without a valuation allowance $ 5  
Interest Income Recognized, without a valuation allowance  
Other construction and land [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, without a valuation allowance $ 62 69
Unpaid Principal Balance, without a valuation allowance $ 105 $ 109
Associated Allowance, without a valuation allowance
Average Recorded Investment, without a valuation allowance $ 65 $ 79
Interest Income Recognized, without a valuation allowance 1
1-4 family residential mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, without a valuation allowance $ 504 525
Unpaid Principal Balance, without a valuation allowance $ 528 $ 545
Associated Allowance, without a valuation allowance
Average Recorded Investment, without a valuation allowance $ 747 $ 437
Interest Income Recognized, without a valuation allowance 19 $ 16
Home equity lines of credit [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, without a valuation allowance  
Unpaid Principal Balance, without a valuation allowance  
Associated Allowance, without a valuation allowance  
Average Recorded Investment, without a valuation allowance   $ 50
Interest Income Recognized, without a valuation allowance   3
Commercial owner occupied real estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, without a valuation allowance   1,103
Unpaid Principal Balance, without a valuation allowance   $ 1,103
Associated Allowance, without a valuation allowance  
Average Recorded Investment, without a valuation allowance   $ 1,124
Interest Income Recognized, without a valuation allowance   $ 60
Commercial non-owner occupied real estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, without a valuation allowance 1,072
Unpaid Principal Balance, without a valuation allowance $ 1,072
Associated Allowance, without a valuation allowance
Average Recorded Investment, without a valuation allowance $ 1,086 $ 46
Interest Income Recognized, without a valuation allowance $ 35