Loans and the Allowance for Loan Losses (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Impaired loans
Unpaid Contractual Principal Balance	$ 243,288	$ 295,241
Recorded Investment With Allowance	75,637	66,018
Recorded Investment With No Allowance	69,446	100,674
Total Recorded Investment	145,083	166,692
Related Allowance	19,169	15,410
Commercial, financial, agricultural [Member]
Impaired loans
Unpaid Contractual Principal Balance	5,587	9,575
Recorded Investment With Allowance	1,641	3,358
Recorded Investment With No Allowance	1,750	2,913
Total Recorded Investment	3,391	6,271
Related Allowance	715	1,441
Lease financing [Member]
Impaired loans
Unpaid Contractual Principal Balance
Recorded Investment With Allowance
Recorded Investment With No Allowance
Total Recorded Investment
Related Allowance
Real estate - construction [Member]
Impaired loans
Unpaid Contractual Principal Balance	2,823	18,204
Recorded Investment With Allowance	154	108
Recorded Investment With No Allowance	1,932	7,076
Total Recorded Investment	2,086	7,184
Related Allowance	2	16
Real estate - 1-4 family mortgage [Member]
Impaired loans
Unpaid Contractual Principal Balance	96,536	99,121
Recorded Investment With Allowance	35,690	27,047
Recorded Investment With No Allowance	16,789	26,785
Total Recorded Investment	52,479	53,832
Related Allowance	10,011	6,077
Real estate - commercial mortgage [Member]
Impaired loans
Unpaid Contractual Principal Balance	138,342	168,341
Recorded Investment With Allowance	38,152	35,505
Recorded Investment With No Allowance	48,975	63,900
Total Recorded Investment	87,127	99,405
Related Allowance	8,441	7,876
Installment loans to individuals [Member]
Impaired loans
Unpaid Contractual Principal Balance
Recorded Investment With Allowance
Recorded Investment With No Allowance
Total Recorded Investment
Related Allowance