Credit Quality of Loans and Allowance for Loan Losses - Schedule of Modified Troubled Debt Restucturings During the Period (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) contract	Sep. 30, 2016 USD ($) contract	Sep. 30, 2017 USD ($) contract	Sep. 30, 2016 USD ($) contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract			6	4
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $			$ 2,002	$ 5,515
Commercial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	1	0	6	2
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $	$ 18	$ 0	$ 2,002	$ 3,943
Real estate – commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract			0	2
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $			$ 0	$ 1,572