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Loans and Allowance for Loan Losses - Loan Summary (Details) - USD ($)
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans $ 1,585,194,000   $ 1,323,258,000      
Less: Allowance for loan losses (7,156,025) $ (7,074,000) (5,860,291) $ (5,393,000) $ (5,498,000) $ (5,105,000)
Loans, net 1,578,037,643   1,317,397,909      
Purchased Credit Impaired Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 29,148,000   32,794,000      
Less: Allowance for loan losses (19,000)   (16,000)      
Loans, net 29,129,000   32,778,000      
All Other Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 1,556,046,000   1,290,464,000      
Less: Allowance for loan losses (7,137,000)   (5,844,000)      
Loans, net 1,548,909,000   1,284,620,000      
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 766,086,000   642,988,000      
Less: Allowance for loan losses (3,245,000) (3,135,000) (2,465,000) (2,543,000) (2,489,000) (2,369,000)
Commercial Real Estate [Member] | Purchased Credit Impaired Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 17,632,000   17,903,000      
Less: Allowance for loan losses (19,000)   (16,000)      
Commercial Real Estate [Member] | All Other Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 748,454,000   625,085,000      
Consumer Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 350,422,000   293,457,000      
Less: Allowance for loan losses (1,598,000) (1,528,000) (1,596,000) (1,415,000) (1,653,000) (1,382,000)
Consumer Real Estate [Member] | Purchased Credit Impaired Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 5,799,000   7,450,000      
Less: Allowance for loan losses 0   0      
Consumer Real Estate [Member] | All Other Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 344,623,000   286,007,000      
Construction and Land Development [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 165,906,000   135,409,000      
Less: Allowance for loan losses (709,000) (744,000) (521,000) (565,000) (609,000) (717,000)
Construction and Land Development [Member] | Purchased Credit Impaired Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 4,372,000   5,120,000      
Less: Allowance for loan losses 0   0      
Construction and Land Development [Member] | All Other Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 161,534,000   130,289,000      
Commercial and Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 289,784,000   238,087,000      
Less: Allowance for loan losses (1,362,000) (1,367,000) (1,062,000) (745,000) (644,000) (520,000)
Commercial and Industrial [Member] | Purchased Credit Impaired Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 762,000   858,000      
Less: Allowance for loan losses 0   0      
Commercial and Industrial [Member] | All Other Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 289,022,000   237,229,000      
Consumer and Other [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 12,996,000   13,317,000      
Less: Allowance for loan losses (242,000) $ (300,000) (216,000) $ (125,000) $ (103,000) $ (117,000)
Consumer and Other [Member] | Purchased Credit Impaired Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 583,000   1,463,000      
Less: Allowance for loan losses 0   0      
Consumer and Other [Member] | All Other Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans $ 12,413,000   $ 11,854,000