Loans and the Allowance for Loan Losses - (Details 4) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($) loan	Dec. 31, 2014 USD ($) loan
Restructured loans
Number of Loans | loan	88	53
Pre- Modification Outstanding Recorded Investment	$ 20,982	$ 16,309
Post- Modification Outstanding Recorded Investment	$ 18,881	$ 14,337
Commercial, financial, agricultural
Restructured loans
Number of Loans | loan	2	2
Pre- Modification Outstanding Recorded Investment	$ 507	$ 507
Post- Modification Outstanding Recorded Investment	$ 460	$ 507
Real estate – construction
Restructured loans
Number of Loans | loan	0	0
Pre- Modification Outstanding Recorded Investment	$ 0	$ 0
Post- Modification Outstanding Recorded Investment	$ 0	$ 0
Real estate – 1-4 family mortgage
Restructured loans
Number of Loans | loan	60	35
Pre- Modification Outstanding Recorded Investment	$ 6,084	$ 5,212
Post- Modification Outstanding Recorded Investment	$ 5,563	$ 4,567
Real estate – commercial mortgage
Restructured loans
Number of Loans | loan	25	16
Pre- Modification Outstanding Recorded Investment	$ 14,324	$ 10,590
Post- Modification Outstanding Recorded Investment	$ 12,791	$ 9,263
Installment loans to individuals
Restructured loans
Number of Loans | loan	1	0
Pre- Modification Outstanding Recorded Investment	$ 67	$ 0
Post- Modification Outstanding Recorded Investment	$ 67	$ 0