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Employee Benefits (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Jul. 30, 2015
Jun. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jul. 21, 2015
May 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value     $ 240,000 $ 25,000 $ 38,000    
Contributions to the plans     $ 381,000 $ 360,000 $ 362,000    
Shares owned by ESOP     588,193 588,193      
Stock Issued During Period, Shares, Employee Stock Ownership Plan     35,283 26,511      
Stock Issued During Period, Value, Employee Stock Ownership Plan     $ 649,000 $ 312,000      
Employee Stock Ownership Plan (ESOP), Number of Suspense Shares     146,539 181,822      
Common stock, shares authorized     20,000,000 20,000,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     0 166,717 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     0 0      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value     $ 200,000 $ 1,000 $ 3,000    
Allocated Share-based Compensation Expense     200,000 151,000 1,000    
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense     74,000 56,000 0    
Supplemental Employee Retirement Plan [Member]              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Accrued liabilities     4,900,000 4,300,000      
Supplemental Employee Retirement Plan Expense     510,000 539,000 483,000    
2014 LTIP [Member]              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Common stock, shares authorized             500,000
Summit Financial Group Inc. Employee Stock Ownership Plan [Member]              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Contributions to the ESOP     $ 635,000 $ 429,000 $ 714,000    
Shares owned by ESOP     588,193        
Stock Issued During Period, Shares, Employee Stock Ownership Plan 225,000            
Employee Stock Ownership Plan (ESOP), Weighted Average Purchase Price of Shares Purchased $ 10.80            
Stock Issued During Period, Value, Employee Stock Ownership Plan $ 2,430,000            
Employee Stock Ownership Plan (ESOP), Debt Structure, Indirect Loan, Amount           $ 2,250,000  
Employee Stock Ownership Plan (ESOP), Number of Suspense Shares     146,539     208,333  
Stock Appreciation Rights (SARs) [Member]              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures   166,717          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 6.01          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   5 years          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   20.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     0        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate       1.96%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate       2.75%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate       61.84%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term       10 years