Loans and Allowance for Loan Losses (Details 7) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	$ 1,010,182	$ 974,029
Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	78,089	73,261
Substandard
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	4,419	4,047
Performing TDRs
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	5,798	5,715
Non-accrual
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	3,526	3,429
Total
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	91,832	86,452
Commercial, financial, and agricultural
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	182,493	182,881
Commercial, financial, and agricultural | Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	6,647	10,295
Commercial, financial, and agricultural | Substandard
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	689	798
Commercial, financial, and agricultural | Performing TDRs
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	750	635
Commercial, financial, and agricultural | Non-accrual
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	905	982
Commercial, financial, and agricultural | Total
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	8,991	12,710
Residential real estate | Construction
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	20,299	18,907
Residential real estate | Construction | Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	1,221	665
Residential real estate | Construction | Substandard
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	640	640
Residential real estate | Construction | Performing TDRs
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	0	0
Residential real estate | Construction | Non-accrual
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	0	0
Residential real estate | Construction | Total
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	1,861	1,305
Residential real estate | Mortgage
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	263,882	259,900
Residential real estate | Mortgage | Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	19,571	16,577
Residential real estate | Mortgage | Substandard
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	2,546	2,159
Residential real estate | Mortgage | Performing TDRs
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	3,559	3,582
Residential real estate | Mortgage | Non-accrual
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	2,016	1,888
Residential real estate | Mortgage | Total
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	27,692	24,206
Real estate - commercial | Construction
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	70,143	55,653
Real estate - commercial | Construction | Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	1,666	1,113
Real estate - commercial | Construction | Substandard
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	97	0
Real estate - commercial | Construction | Performing TDRs
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	0	0
Real estate - commercial | Construction | Non-accrual
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	49	50
Real estate - commercial | Construction | Total
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	1,812	1,163
Real estate - commercial | Mortgage
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	442,266	426,470
Real estate - commercial | Mortgage | Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	48,984	44,611
Real estate - commercial | Mortgage | Substandard
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	425	426
Real estate - commercial | Mortgage | Performing TDRs
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	1,489	1,498
Real estate - commercial | Mortgage | Non-accrual
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	497	420
Real estate - commercial | Mortgage | Total
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	51,395	46,955
Installment and other consumer
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	31,099	30,218
Installment and other consumer | Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	0	0
Installment and other consumer | Substandard
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	22	24
Installment and other consumer | Performing TDRs
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	0	0
Installment and other consumer | Non-accrual
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	59	89
Installment and other consumer | Total
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	$ 81	$ 113