Loans and Leases - Impaired Loans (Details 8) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	$ 44,508	$ 38,827
Impaired loans, with no related allowance, Unpaid Principal Balance	54,497	49,609
Impaired loans with an allowance recorded, Recorded Investment	676	2,374
Impaired loans, with an allowance recorded, Unpaid Principal Balance	717	2,767
Impaired loans with an allowance recorded, Related Allowance	208	1,253
Total impaired loans, Recorded Investment	45,184	41,201
Total impaired loans, Unpaid Principal Balance	55,214	52,376
Total impaired loans, Related Allowance	208	1,253
Commercial, financial and agricultural [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	2,646	3,384
Impaired loans, with no related allowance, Unpaid Principal Balance	4,504	4,422
Impaired loans with an allowance recorded, Recorded Investment	676	1,307
Impaired loans, with an allowance recorded, Unpaid Principal Balance	717	1,700
Impaired loans with an allowance recorded, Related Allowance	208	510
Total impaired loans, Recorded Investment	3,322	4,691
Total impaired loans, Unpaid Principal Balance	5,221	6,122
Total impaired loans, Related Allowance	208	510
Real estate-commercial real estate [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	24,863	19,453
Impaired loans, with no related allowance, Unpaid Principal Balance	30,991	27,146
Impaired loans with an allowance recorded, Recorded Investment		1,067
Impaired loans, with an allowance recorded, Unpaid Principal Balance		1,067
Impaired loans with an allowance recorded, Related Allowance		743
Total impaired loans, Recorded Investment	24,863	20,520
Total impaired loans, Unpaid Principal Balance	30,991	28,213
Total impaired loans, Related Allowance		743
Real estate-construction [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	15,985	15,741
Impaired loans, with no related allowance, Unpaid Principal Balance	17,959	17,268
Total impaired loans, Recorded Investment	15,985	15,741
Total impaired loans, Unpaid Principal Balance	17,959	17,268
Real estate-residential secured for business purpose [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	172	115
Impaired loans, with no related allowance, Unpaid Principal Balance	184	631
Total impaired loans, Recorded Investment	172	115
Total impaired loans, Unpaid Principal Balance	184	631
Real estate-residential secured for personal purpose [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	804	57
Impaired loans, with no related allowance, Unpaid Principal Balance	804	57
Total impaired loans, Recorded Investment	804	57
Total impaired loans, Unpaid Principal Balance	804	57
Real estate-home equity secured for personal purpose [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment		27
Impaired loans, with no related allowance, Unpaid Principal Balance		27
Total impaired loans, Recorded Investment		27
Total impaired loans, Unpaid Principal Balance		27
Loans to individuals [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	38	50
Impaired loans, with no related allowance, Unpaid Principal Balance	55	58
Total impaired loans, Recorded Investment	38	50
Total impaired loans, Unpaid Principal Balance	$ 55	$ 58