Credit Quality of Loans and Allowance for Loan Losses - Schedule of Defaults on Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Schedule of Defaults on Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 18	$ 0	$ 18	$ 5,515
Commercial, financial and agricultural
Schedule of Defaults on Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	18	0	18	3,943
Real estate – commercial
Schedule of Defaults on Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0	$ 0	$ 1,572