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Loans and Allowance for Loan Losses - Loan Summary (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans $ 1,840,569,000 $ 1,777,239,000    
Less: Allowance for loan losses (8,704,413) (8,275,055) $ (6,477,000) $ (5,860,000)
Loans, net 1,831,864,834 1,768,963,569    
Purchased Credit Impaired Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 32,868,000 34,158,000    
Less: Allowance for loan losses (54,000) 0    
Loans, net 32,814,000 34,158,000    
All Other Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 1,807,701,000 1,743,081,000    
Less: Allowance for loan losses (8,650,000) (8,275,000)    
Loans, net 1,799,051,000 1,734,806,000    
Commercial Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 888,942,000 860,027,000    
Less: Allowance for loan losses (4,074,000) (3,639,000) (2,925,000) (2,465,000)
Commercial Real Estate [Member] | Purchased Credit Impaired Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 17,299,000 17,682,000    
Less: Allowance for loan losses (40,000) 0    
Commercial Real Estate [Member] | All Other Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 871,643,000 842,345,000    
Consumer Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 410,981,000 407,254,000    
Less: Allowance for loan losses (1,949,000) (1,789,000) (1,519,000) (1,596,000)
Consumer Real Estate [Member] | Purchased Credit Impaired Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 8,146,000 8,712,000    
Less: Allowance for loan losses (14,000) 0    
Consumer Real Estate [Member] | All Other Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 402,835,000 398,542,000    
Construction and Land Development [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 187,009,000 187,895,000    
Less: Allowance for loan losses (854,000) (795,000) (627,000) (521,000)
Construction and Land Development [Member] | Purchased Credit Impaired Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 4,670,000 4,602,000    
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 182,339,000 183,293,000    
Commercial and Industrial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 341,471,000 308,254,000    
Less: Allowance for loan losses (1,709,000) (1,746,000) (1,210,000) (1,062,000)
Commercial and Industrial [Member] | Purchased Credit Impaired Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 2,300,000 2,557,000    
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 339,171,000 305,697,000    
Consumer and Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 12,166,000 13,809,000    
Less: Allowance for loan losses (118,000) (306,000) $ (196,000) $ (216,000)
Consumer and Other [Member] | Purchased Credit Impaired Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 453,000 605,000    
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 $ 11,713,000 $ 13,204,000