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Loans and Allowance for Credit Losses - Loan Portfolio Aging (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due $ 800,000 $ 302,000
Current 754,561,000 597,392,000
Loans 755,361,000 597,694,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 2,180,000 2,413,000
Commercial and industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Current 88,652,000 102,197,000
Loans 88,652,000 102,197,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 447,000 29,000
Agricultural land and production    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Current 25,509,000 30,472,000
Loans 25,509,000 30,472,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 0 0
Owner occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 87,000 0
Current 191,578,000 168,910,000
Loans 191,665,000 168,910,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 107,000 347,000
Real estate construction and other land loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Current 69,200,000 38,685,000
Loans 69,200,000 38,685,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 0 0
Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 565,000 98,000
Current 183,660,000 117,146,000
Loans 184,225,000 117,244,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 1,082,000 567,000
Agricultural real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Current 86,761,000 74,867,000
Loans 86,761,000 74,867,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 0 0
Other real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Current 18,945,000 10,520,000
Loans 18,945,000 10,520,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 0 0
Equity loans and lines of credit    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 110,000 166,000
Current 64,384,000 42,130,000
Loans 64,494,000 42,296,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 526,000 1,457,000
Consumer and installment    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 38,000 38,000
Current 25,872,000 12,465,000
Loans 25,910,000 12,503,000
Recorded Investment Greater Than 90 Days Accruing 0 0
Non-accrual 18,000 13,000
Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 752,000 136,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial and industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural land and production    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Owner occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 87,000 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Real estate construction and other land loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 565,000 98,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Other real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Equity loans and lines of credit    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 62,000 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer and installment    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 38,000 38,000
Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 48,000 166,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial and industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural land and production    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Owner occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Real estate construction and other land loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Other real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Equity loans and lines of credit    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 48,000 166,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer and installment    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Agricultural land and production    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Owner occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real estate construction and other land loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Agricultural real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Other real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Equity loans and lines of credit    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer and installment    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due $ 0 $ 0