Loans and Leases - Impaired Loans (Details 6) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	$ 40,885	$ 44,508
Impaired loans, with no related allowance, Unpaid Principal Balance	50,290	54,497
Impaired loans with an allowance recorded, Recorded Investment	660	676
Impaired loans, with an allowance recorded, Unpaid Principal Balance	713	717
Total impaired loans, Recorded Investment	41,545	45,184
Total impaired loans, Unpaid Principal Balance	51,003	55,214
Total impaired loans, Related Allowance	252	208
Commercial, financial and agricultural [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	1,637	2,646
Impaired loans, with no related allowance, Unpaid Principal Balance	3,222	4,504
Impaired loans with an allowance recorded, Recorded Investment	660	676
Impaired loans, with an allowance recorded, Unpaid Principal Balance	713	717
Total impaired loans, Recorded Investment	2,297	3,322
Total impaired loans, Unpaid Principal Balance	3,935	5,221
Total impaired loans, Related Allowance	252	208
Real estate-commercial real estate [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	22,445	24,863
Impaired loans, with no related allowance, Unpaid Principal Balance	28,217	30,991
Total impaired loans, Recorded Investment	22,445	24,863
Total impaired loans, Unpaid Principal Balance	28,217	30,991
Total impaired loans, Related Allowance
Real estate-construction [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	15,764	15,985
Impaired loans, with no related allowance, Unpaid Principal Balance	17,785	17,959
Total impaired loans, Recorded Investment	15,764	15,985
Total impaired loans, Unpaid Principal Balance	17,785	17,959
Total impaired loans, Related Allowance
Real estate-residential secured for business purpose [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	171	172
Impaired loans, with no related allowance, Unpaid Principal Balance	182	184
Total impaired loans, Recorded Investment	171	172
Total impaired loans, Unpaid Principal Balance	182	184
Total impaired loans, Related Allowance
Real estate-residential secured for personal purpose [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	804	804
Impaired loans, with no related allowance, Unpaid Principal Balance	804	804
Total impaired loans, Recorded Investment	804	804
Total impaired loans, Unpaid Principal Balance	804	804
Total impaired loans, Related Allowance
Real estate-home equity secured for personal purpose [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	23
Impaired loans, with no related allowance, Unpaid Principal Balance	23
Total impaired loans, Recorded Investment	23
Total impaired loans, Unpaid Principal Balance	23
Total impaired loans, Related Allowance
Loans to individuals [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	41	38
Impaired loans, with no related allowance, Unpaid Principal Balance	57	55
Total impaired loans, Recorded Investment	41	38
Total impaired loans, Unpaid Principal Balance	57	55
Total impaired loans, Related Allowance