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Loans and Allowance for Loan Losses - Loan Summary (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 797,142,000 $ 727,715,000  
Less: Allowance for loan losses (4,964,000) (4,354,000) $ (3,880,000)
Loans, net 792,178,219 723,360,786  
Purchased Credit Impaired Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 28,835,000 38,277,000  
Less: Allowance for loan losses 0 0  
Loans, net 28,835,000 38,277,000  
All Other Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 768,307,000 689,438,000  
Less: Allowance for loan losses (4,964,000) (4,354,000)  
Loans, net 763,343,000 685,084,000  
Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 394,346,000 369,777,000  
Less: Allowance for loan losses (2,246,000) (1,906,000) (1,734,000)
Commercial Real Estate [Member] | Purchased Credit Impaired Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 15,750,000 20,050,000  
Commercial Real Estate [Member] | All Other Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 378,596,000 349,727,000  
Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 183,528,000 161,694,000  
Less: Allowance for loan losses (1,243,000) (1,015,000) (906,000)
Consumer Real Estate [Member] | Purchased Credit Impaired Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 9,765,000 12,764,000  
Consumer Real Estate [Member] | All Other Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 173,763,000 148,930,000  
Construction and Land Development [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 128,733,000 105,478,000  
Less: Allowance for loan losses (861,000) (627,000) (690,000)
Construction and Land Development [Member] | Purchased Credit Impaired Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 1,704,000 2,695,000  
Construction and Land Development [Member] | All Other Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 127,029,000 102,783,000  
Commercial and Industrial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 83,534,000 84,951,000  
Less: Allowance for loan losses (576,000) (777,000) (524,000)
Commercial and Industrial [Member] | Purchased Credit Impaired Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 1,616,000 2,768,000  
Commercial and Industrial [Member] | All Other Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 81,918,000 82,183,000  
Consumer and Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 7,001,000 5,815,000  
Less: Allowance for loan losses (38,000) (29,000) $ (26,000)
Consumer and Other [Member] | Purchased Credit Impaired Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 0 0  
Consumer and Other [Member] | All Other Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 7,001,000 $ 5,815,000