Loans and Leases - Impaired Loans (Details 6) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	$ 40,244	$ 38,827
Impaired loans, with no related allowance, Unpaid Principal Balance	56,522	49,609
Impaired loans with an allowance recorded, Recorded Investment	3,109	2,374
Impaired loans, with an allowance recorded, Unpaid Principal Balance	3,678	2,767
Impaired loans with an allowance recorded, Related Allowance	690	1,253
Total impaired loans, Recorded Investment	43,353	41,201
Total impaired loans, Unpaid Principal Balance	60,200	52,376
Total impaired loans, Related Allowance	690	1,253
Loans held for sale [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	2,599
Impaired loans, with no related allowance, Unpaid Principal Balance	6,621
Total impaired loans, Recorded Investment	2,599
Total impaired loans, Unpaid Principal Balance	6,621
Commercial, financial and agricultural [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	3,262	3,384
Impaired loans, with no related allowance, Unpaid Principal Balance	7,815	4,422
Impaired loans with an allowance recorded, Recorded Investment	970	1,307
Impaired loans, with an allowance recorded, Unpaid Principal Balance	1,347	1,700
Impaired loans with an allowance recorded, Related Allowance	428	510
Total impaired loans, Recorded Investment	4,232	4,691
Total impaired loans, Unpaid Principal Balance	9,162	6,122
Total impaired loans, Related Allowance	428	510
Real estate-commercial [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	17,767	19,453
Impaired loans, with no related allowance, Unpaid Principal Balance	23,476	27,146
Impaired loans with an allowance recorded, Recorded Investment	2,139	1,067
Impaired loans, with an allowance recorded, Unpaid Principal Balance	2,331	1,067
Impaired loans with an allowance recorded, Related Allowance	262	743
Total impaired loans, Recorded Investment	19,906	20,520
Total impaired loans, Unpaid Principal Balance	25,807	28,213
Total impaired loans, Related Allowance	262	743
Real estate-construction [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	16,070	15,741
Impaired loans, with no related allowance, Unpaid Principal Balance	18,044	17,268
Total impaired loans, Recorded Investment	16,070	15,741
Total impaired loans, Unpaid Principal Balance	18,044	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	175	115
Impaired loans, with no related allowance, Unpaid Principal Balance	186	631
Total impaired loans, Recorded Investment	175	115
Total impaired loans, Unpaid Principal Balance	186	631
Total impaired loans, Related Allowance
Real estate-residential secured for personal purpose [Member]
Impaired Loans
Impaired loans, with no related allowance, Recorded Investment	323	57
Impaired loans, with no related allowance, Unpaid Principal Balance	323	57
Total impaired loans, Recorded Investment	323	57
Total impaired loans, Unpaid Principal Balance	323	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	48	50
Impaired loans, with no related allowance, Unpaid Principal Balance	57	58
Total impaired loans, Recorded Investment	48	50
Total impaired loans, Unpaid Principal Balance	57	58
Total impaired loans, Related Allowance