Loans - Loans by class modified as TDRs occurred (Details 7) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) Loan	Sep. 30, 2015 USD ($) Loan	Sep. 30, 2016 USD ($) Loan	Sep. 30, 2015 USD ($) Loan
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan		2	2	2
Pre-Modification Outstanding Recorded Investment		$ 2,132	$ 6,332	$ 2,132
Post-Modification Outstanding Recorded Investment		$ 928	$ 4,705	$ 928
Commercial, financial, and agricultural | Commercial
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan		1		1
Pre-Modification Outstanding Recorded Investment		$ 2,046		$ 2,046
Post-Modification Outstanding Recorded Investment		846		$ 846
Commercial, financial, and agricultural | Financial
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment
Commercial, financial, and agricultural | Agricultural
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment
Commercial, financial, and agricultural | Equity lines
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment
Commercial, financial, and agricultural | Other
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment
Commercial real estate | Owner occupied
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan			1
Pre-Modification Outstanding Recorded Investment			$ 4,508
Post-Modification Outstanding Recorded Investment			$ 3,370
Commercial real estate | Non Owner occupied
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan			1
Pre-Modification Outstanding Recorded Investment			$ 1,824
Post-Modification Outstanding Recorded Investment			$ 1,335
Residential real estate | Secured by first liens
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan		1		1
Pre-Modification Outstanding Recorded Investment		$ 86		$ 86
Post-Modification Outstanding Recorded Investment		$ 82		$ 82
Residential real estate | Secured by junior liens
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment
Acquisition, development and construction | Residential
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment
Acquisition, development and construction | Other
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment
Consumer
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment