Loans and Allowance for Loan Losses (Details 4) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Categories of impaired loans
Non-accrual loans	$ 30,840,000	$ 31,081,000
Troubled debt restructurings continuing to accrue interest	7,792,000	8,282,000
Total impaired loans, Recorded Investment	38,632,000	39,363,000
Additional information about impaired loans
Impaired loans individually evaluated for impairment	38,403,000	39,189,000
Impaired loans were evaluated based on the fair value of the loan's collateral	35,672,000	36,142,000
Percentage of impaired loans for which no reserve allocation required	28.00%	37.00%
Recorded Investment, With no related allowance recorded	10,689,000	14,733,000
Recorded Investment, With an allowance recorded	27,943,000	24,630,000
Total impaired loans, Recorded Investment	38,632,000	39,363,000
Unpaid Principal Balance, With no related allowance recorded	11,732,000	16,594,000
Unpaid Principal Balance, With an allowance recorded	29,658,000	25,308,000
Total impaired loans, Unpaid Principal Balance	41,390,000	41,902,000
Specific Reserves, With an allowance recorded	5,886,000	4,020,000
Commercial, financial, and agricultural
Categories of impaired loans
Non-accrual loans	1,957,000	1,335,000
Additional information about impaired loans
Recorded Investment, With no related allowance recorded	2,372,000	3,272,000
Recorded Investment, With an allowance recorded	1,960,000	885,000
Unpaid Principal Balance, With no related allowance recorded	2,423,000	4,009,000
Unpaid Principal Balance, With an allowance recorded	2,037,000	898,000
Specific Reserves, With an allowance recorded	580,000	213,000
Real estate - construction residential
Categories of impaired loans
Non-accrual loans	2,280,000	2,497,000
Additional information about impaired loans
Recorded Investment, With no related allowance recorded	105,000	2,307,000
Recorded Investment, With an allowance recorded	2,175,000	189,000
Unpaid Principal Balance, With no related allowance recorded	139,000	2,339,000
Unpaid Principal Balance, With an allowance recorded	2,273,000	189,000
Specific Reserves, With an allowance recorded	248,000	125,000
Real estate - construction commercial
Categories of impaired loans
Non-accrual loans	7,831,000	7,762,000
Additional information about impaired loans
Recorded Investment, With no related allowance recorded	2,942,000	1,879,000
Recorded Investment, With an allowance recorded	4,889,000	5,883,000
Unpaid Principal Balance, With no related allowance recorded	3,227,000	2,102,000
Unpaid Principal Balance, With an allowance recorded	5,067,000	6,011,000
Specific Reserves, With an allowance recorded	768,000	542,000
Real estate - residential
Categories of impaired loans
Non-accrual loans	4,702,000	5,330,000
Additional information about impaired loans
Recorded Investment, With no related allowance recorded	1,605,000	1,939,000
Recorded Investment, With an allowance recorded	4,149,000	3,832,000
Unpaid Principal Balance, With no related allowance recorded	2,083,000	2,393,000
Unpaid Principal Balance, With an allowance recorded	4,324,000	3,999,000
Specific Reserves, With an allowance recorded	1,156,000	1,069,000
Real estate - commercial
Categories of impaired loans
Non-accrual loans	13,797,000	13,938,000
Additional information about impaired loans
Recorded Investment, With no related allowance recorded	3,436,000	5,162,000
Recorded Investment, With an allowance recorded	14,726,000	13,797,000
Unpaid Principal Balance, With no related allowance recorded	3,615,000	5,565,000
Unpaid Principal Balance, With an allowance recorded	15,913,000	14,167,000
Specific Reserves, With an allowance recorded	3,128,000	2,071,000
Consumer
Additional information about impaired loans
Non-accrual loans that were collectively evaluated for impairment	229,000	174,000
Recorded Investment, With no related allowance recorded	229,000	174,000
Recorded Investment, With an allowance recorded	44,000	44,000
Unpaid Principal Balance, With no related allowance recorded	245,000	186,000
Unpaid Principal Balance, With an allowance recorded	44,000	44,000
Specific Reserves, With an allowance recorded	$ 6,000