Loans and Leases - Impaired Loans (Details 6) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	$ 42,743	$ 38,827
Impaired loans, with no related allowance, Unpaid Principal Balance	55,043	49,609
Impaired loans with an allowance recorded, Recorded Investment	987	2,374
Impaired loans, with an allowance recorded, Unpaid Principal Balance	1,359	2,767
Impaired loans with an allowance recorded, Related Allowance	432	1,253
Total impaired loans, Recorded Investment	43,730	41,201
Total impaired loans, Unpaid Principal Balance	56,402	52,376
Total impaired loans, Related Allowance	432	1,253
Commercial, financial and agricultural [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	4,660	3,384
Impaired loans, with no related allowance, Unpaid Principal Balance	5,938	4,422
Impaired loans with an allowance recorded, Recorded Investment	987	1,307
Impaired loans, with an allowance recorded, Unpaid Principal Balance	1,359	1,700
Impaired loans with an allowance recorded, Related Allowance	432	510
Total impaired loans, Recorded Investment	5,647	4,691
Total impaired loans, Unpaid Principal Balance	7,297	6,122
Total impaired loans, Related Allowance	432	510
Real estate-commercial [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	20,876	19,453
Impaired loans, with no related allowance, Unpaid Principal Balance	29,836	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	20,876	20,520
Total impaired loans, Unpaid Principal Balance	29,836	28,213
Total impaired loans, Related Allowance		743
Real estate-construction [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	16,669	15,741
Impaired loans, with no related allowance, Unpaid Principal Balance	18,713	17,268
Total impaired loans, Recorded Investment	16,669	15,741
Total impaired loans, Unpaid Principal Balance	18,713	17,268
Total impaired loans, Related Allowance
Real estate-residential secured for business purpose [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	177	115
Impaired loans, with no related allowance, Unpaid Principal Balance	187	631
Total impaired loans, Recorded Investment	177	115
Total impaired loans, Unpaid Principal Balance	187	631
Total impaired loans, Related Allowance
Real estate-residential secured for personal purpose [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	312	57
Impaired loans, with no related allowance, Unpaid Principal Balance	312	57
Total impaired loans, Recorded Investment	312	57
Total impaired loans, Unpaid Principal Balance	312	57
Total impaired loans, Related Allowance
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
Total impaired loans, Related Allowance
Loans to individuals [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	49	50
Impaired loans, with no related allowance, Unpaid Principal Balance	57	58
Total impaired loans, Recorded Investment	49	50
Total impaired loans, Unpaid Principal Balance	57	58
Total impaired loans, Related Allowance