Loans and the Allowance for Loan Losses (Details 7) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Loan portfolio not subject to risk rating
Loan portfolio	$ 1,094,311	$ 1,032,128
Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	1,089,431	1,026,050
Non-Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	4,880	6,078
Commercial, financial, agricultural [Member]
Loan portfolio not subject to risk rating
Loan portfolio	73,896	74,213
Commercial, financial, agricultural [Member] | Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	73,510	74,003
Commercial, financial, agricultural [Member] | Non-Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	386	210
Lease financing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	103	195
Lease financing [Member] | Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	103	195
Lease financing [Member] | Non-Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	0	0
Real estate - construction [Member]
Loan portfolio not subject to risk rating
Loan portfolio	32,548	31,774
Real estate - construction [Member] | Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	32,548	31,774
Real estate - construction [Member] | Non-Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	0	0
Real estate - 1-4 family mortgage [Member]
Loan portfolio not subject to risk rating
Loan portfolio	710,121	675,402
Real estate - 1-4 family mortgage [Member] | Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	706,724	670,074
Real estate - 1-4 family mortgage [Member] | Non-Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	3,397	5,328
Real estate - commercial mortgage [Member]
Loan portfolio not subject to risk rating
Loan portfolio	216,711	195,535
Real estate - commercial mortgage [Member] | Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	215,780	195,086
Real estate - commercial mortgage [Member] | Non-Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	931	449
Installment loans to individuals [Member]
Loan portfolio not subject to risk rating
Loan portfolio	60,932	55,009
Installment loans to individuals [Member] | Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	60,766	54,918
Installment loans to individuals [Member] | Non-Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	$ 166	$ 91